CN110174434A - Heterogeneous content and its method of distribution in a kind of measurement porous material - Google Patents

Heterogeneous content and its method of distribution in a kind of measurement porous material Download PDF

Info

Publication number
CN110174434A
CN110174434A CN201910442695.1A CN201910442695A CN110174434A CN 110174434 A CN110174434 A CN 110174434A CN 201910442695 A CN201910442695 A CN 201910442695A CN 110174434 A CN110174434 A CN 110174434A
Authority
CN
China
Prior art keywords
sheet
heat source
heat
plane
distribution
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201910442695.1A
Other languages
Chinese (zh)
Other versions
CN110174434B (en
Inventor
张腾飞
李品
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianjin University
Original Assignee
Tianjin University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tianjin University filed Critical Tianjin University
Priority to CN201910442695.1A priority Critical patent/CN110174434B/en
Publication of CN110174434A publication Critical patent/CN110174434A/en
Application granted granted Critical
Publication of CN110174434B publication Critical patent/CN110174434B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00Investigating or analyzing materials by the use of thermal means
    • G01N25/20Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity

Abstract

The invention discloses heterogeneous content and its methods of distribution in a kind of measurement porous material, the method for arranging fitted closely by the first heat-flow meter sensor, sheet-like plane heat source, the second heat-flow meter sensor, measure the temperature rise and hot-fluid distribution of sheet-like plane heat source two sides, uneven distribution heterogeneous in measured material can be effectively recognized, while realizing that one-shot measurement obtains the heterogeneous content of sheet-like plane heat source two sides.Based on the above method, according to the Limited propagation thickness of thermal perturbation, reasonable Arrangement sensor test position avoids in material that there are measurement blind areas, heterogeneous content in material, which is obtained, by data interpolating and fitting finally obtains the one-dimensional of heterogeneous content in material, plane or three-dimensional distribution with the function of change in location.

Description

Heterogeneous content and its method of distribution in a kind of measurement porous material
Technical field
The invention belongs to testing of materials analysis technical fields, are related to a kind of Adsorbent By Using Transient Plane Source Technique based on heat-flow meter, come Measure heterogeneous content and its method of distribution in porous material.
Background technique
When there is heterogeneous intrusion in porous material, the physical parameter and service performance of material itself are changed correspondingly.For example, wide There are moisture-absorption characteristics for the general porous insulation material applied to building energy saving field, and the intrusion of moisture causes to keep the temperature in use Soundproof effect decline, and mildew is bred, the service life of material is reduced, building energy consumption is increased.Therefore, accurately measurement material is heterogeneous Content and its distribution have very great help for the service performance tool for promoting material.
The detection of foreign elements content has electric method, calorifics method, ray method etc. in porous material at present.Wherein calorifics method because The easy inexpensively broad range of applicability of measurement.Heat source is arranged in calorifics method in measured material, by monitoring away from heat source fixed range Material in certain point transient temperature rise, solve measured material thermal physical property parameter, such as volumetric heat capacity, the variation before and after heterogeneous intrusion Amount, the final heterogeneous content obtained in measured material.The current calorifics method measurement heterogeneous content of material has the disadvantage in that
(1) since heater separates arrangement with temperature point, temperature point monitors that the premise of effective temperature rise is heater There is larger calorific value, and big calorific value will induce free convection and radiant heat transfer in portion in the porous material, reduce measuring accuracy;
(2) arranged in actual measurement material deformation that heater and temperature measuring point may cause make heater and temperature measuring point it Between distance be not fixed, influence the accuracy of heterogeneous content measurement;
(3) distribution when heterogeneous intrusion measured material may and it is uneven, therefore heater is in material on different directions Generated hot-fluid may be also uneven, and traditional thermology method is only applicable to the situation that heterogeneous content is evenly distributed in material;
(4) heterogeneous in the resulting measured material of existing measurement method containing numerical quantity or numberical range majority is by single measuring point It measures, can not effectively speculate the spatial distribution of heterogeneous content in material.
Summary of the invention
In order to solve the problems in the existing technology, the present invention provide in a kind of measurement porous material heterogeneous content and its The method of distribution solves the problems, such as the measurement error as caused by the separation arrangement of heat source and measuring point in the prior art.
The operating procedure of technical solution of the present invention is as follows:
(1) the first heat-flow meter sensor, sheet-like plane heat source, the second heat-flow meter sensor are arranged in order and make its phase It mutually fits closely, is arranged in parallel with measured material surface in material internal;
(2) recording stable and equally distributed temperature in measured material is initial temperature T0
(3) heater circuit is connected, the sheet-like plane heat source that area A, constant heat generation power are Q generates total heat in material Stream is denoted asMeet relationship
(4) temperature and hot-fluid that sheet-like plane heat source side is measured by the first heat-flow meter sensor, are denoted as T1WithBy Two heat-flow meter sensors measure the temperature and hot-fluid of the sheet-like plane heat source other side, are denoted as T2With
(5) initial temperature is subtracted by the first heat-flow meter sensor temperature measurement data, obtains sheet-like plane heat source side heat-flow meter Temperature rise Δ T is corresponded at Sensor1E(t);Initial temperature is subtracted by the second heat-flow meter sensor temperature measurement data, it is flat to obtain sheet Temperature rise value Δ T is corresponded at the heat-flow meter sensor measuring point of the plane heat source other side2E(t);
(6) the sheet-like plane heat source two sides hot-fluid measured according to step (4)WithDetermine total hot-fluidAlong sheet-like plane The distribution coefficient f of heat source two sidesi, i.e.,In conjunction with the one dimensional heat transfer of transient state flat heat source Process Heat Conduction Differential Equations, boundary condition and primary condition obtain sheet-like plane heat source two layers of material in heat-flow meter sensor Position is in the temperature rise analytic solutions Δ T in the t time1(t) and Δ T2(t);
Temperature rise analytic solutions Δ T of the sheet-like plane heat source two layers of material in heat-flow meter sensor position1(t) and Δ T2(t) lead The hot differential equation, boundary condition and primary condition meet:
T=0, Ti=T0 (4)
With reference to H.S.Carlslaw, J.C.Jaeger.Conduction of Heat in Solids.2nd Solutions of Partial Differential Equations group in Edition.Oxford Clarendon Press, 1986:89-112 obtains being measured and monitored the growth of standing timber Expect x=liThe temperature rise analytic solutions on boundary are as follows:
Wherein, footnote i distinguishes sheet-like plane heat source two sides, is sheet-like plane heat source side measuring point when i=1, and when i=2 is Sheet-like plane heat source other side measuring point;TiFor the temperature of measured material, K;T0For the initial temperature of measured material, K;λ is to be measured and monitored the growth of standing timber The thermal coefficient of material, Wm-1K-1;ρ is the density of measured material, kgm-3;C is the specific heat capacity of measured material, Jkg-1K-1;ρ c is quilt Measure and monitor the growth of standing timber the heat capacity of volume (Jm of material-3K-1);fiFor the total hot-fluid determined by heat-flow meter sensorAlong sheet-like plane heat source two sides Distribution coefficient, i.e., For sheet-like plane heat source total hot-fluid, W/m2;liFor sheet Parallel distance of the flat heat source measuring point to measured material surface, m;α is the thermal diffusivity of measured material, m2/s;
(7) the temperature rise value Δ T of middle the surveyed sheet-like plane heat source two sides of comparison step (5)1E(t)、ΔT2E(t) with step (6) The temperature rise analytic solutions Δ T of middle corresponding position measuring point1(t)、ΔT2(t), the thermal physical property parameter in transform analysis solution surveys experiment The temperature rise difference value of temperature rise and temperature rise analytic solutions is minimum or in acceptable thresholds, obtains leading for sheet-like plane heat source two sides at this time The numerical value of hot coefficient lambda, heat capacity of volume ρ c and thermal diffusivity α;
(8) according to the one-to-one relationship of the volumetric heat capacity ρ c of measured material and the heterogeneous content of measured material, sheet is calculated The heterogeneous content of flat heat source two layers of material;
(9) since each test data can only represent the heterogeneous content in the limited transmitting thickness of Transient Heat Transfer, with interval distance From diIt arranges measuring point, repeats step (1)~(8) and heterogeneous content measurement is carried out to different measuring points, according to gained point position and right The heterogeneous content answered carries out data processing to institute's measured data by data processing software, obtains material according to specific measurement request The non-homogeneous heterogeneous content distribution of certain dimension in expecting.
May determine that whether the heterogeneous content distribution in sheet-like plane heat source two sides is uniform by step (4): when When, heterogeneous content distribution is uniform at material measuring point at left and right sides of sheet-like plane heat source;WhenWhen, sheet-like plane heat source is left Heterogeneous content distribution is uneven at right two layers of material measuring point.
In step (9) when design point layout scheme, defined by the penetration thickness of thermal perturbation in thermal conduction study in the material It is found that the thermal perturbation at sheet-like plane heat source can only transmit limited thickness in measured material within a certain period of time, and herein Material area other than thickness keeps original state, therefore arranges inside measured material and should ensure that in penetration thickness when measuring point At least one measuring point, avoids in measured material that there are measurement blind area, the arrangement spacing d of measuring pointiIt should meet:
Wherein;τ is the duration of single measurement heat source fever, s;It is poor with the temperature rise of temperature rise analytic solutions that α rises for experiment institute's thermometric Different thermal diffusivity value minimum or be calculated in acceptance threshold, m2/s。
In step (9) when design point layout scheme can according to the specific requirement of heterogeneous distribution measuring in measured material into Row various dimensions point layout simultaneously records point position parameter, corresponding to obtain in measured material heterogeneous one-dimensional, plane or three-dimensional point Cloth.
Data processing in step (9) is carried out at interpolation to the heterogeneous content of the resulting multiple groups of measurement and corresponding position parameter Reason, passes through the input data in data processing software and writes corresponding interpolation processing program, can get heterogeneous in measured material contain The one-dimensional, plane of amount or three-dimensional distribution situation can be fitted to obtain in measured material heterogeneous content with measuring point position according to interpolation result Set the fitting function X of variationwAnd its distribution:
Xw=(x, y, z, xw) (7)
Wherein, the coordinate that x, y, z are marked in measured material using a certain position as origin by measuring point, m;xwFor measuring point position It sets parameter and corresponds to heterogeneous content.According to fitting function the heterogeneous content in any position in material can be obtained by substituting into location parameter.
Beneficial effects of the present invention: the present invention is due to being provided with sheet type heat-flow meter sensing in sheet-like plane heat source two sides Device, heat-flow meter sensor can measure hot-fluid and temperature simultaneously, pass through the temperature rise of sheet-like plane heat source two layers of material and hot-fluid point Match, effectively recognize heterogeneous uneven distribution, while compared with previous measurement method, realizes one-shot measurement and obtain heat source two sides The heterogeneous content of material.It can be obtained one-dimensional, flat in measured material using Transient Heat Transfer limited thickness as arranged for interval test position The heterogeneous content spatial distribution of face or solid.Further, since sheet heat source is bonded arrangement with heat-flow meter, previous calorifics side is avoided The measurement error as caused by the separation arrangement of heat source and measuring point in method, heat source needed for reducing acquisition effectively detection temperature rise are sent out Heat.By converting the measurement position of heat source and heat-flow meter sensor, and with the Limited propagation of thermal perturbation with a thickness of between space Every to measure distribution of the heterogeneous content in space.The it is proposed of the method for the present invention solves non-equal in measurement porous material One heterogeneous content and its problem of distribution.
Detailed description of the invention
Fig. 1 is that the measuring probe of heterogeneous content and its method of distribution shows in a kind of measurement porous material provided by the invention It is intended to;In figure: 1 is sheet-like plane heat source;2 first heat-flow meter sensors;3 second heat-flow meter sensors;4 measured materials;l1And l2 Respectively parallel distance of the sheet-like plane heat source apart from measured material or so surface, m;U is the voltage for being supplied to heater, V;
Fig. 2 is that the point layout of heterogeneous content and its method of distribution is former in a kind of measurement porous material provided by the invention Reason figure, point layout spacing di, m;τ is testing time, s;α1、α2Institute's thermometric is tested for heat source two sides to rise and temperature rise analytic solutions Temperature rise difference value minimum or the obtained thermal diffusivity in acceptable thresholds, m2/s;f1、f2It is distributed for the hot-fluid of heat source two sides Coefficient;For sheet-like plane heat source total hot-fluid, W/m2;N=1,2,3, n is measuring point number;
Fig. 3 is the operating process of heterogeneous content and its method of distribution in a kind of measurement porous material provided by the invention Figure;In figure: T1And T1The temperature and hot-fluid generated at left and right sides of it for sheet-like plane heat source;fiTo be passed by heat-flow meter Total hot-fluid determined by sensorDistribution coefficient along sheet-like plane heat source two sides, and f1+f2=1;It is total for sheet-like plane heat source Hot-fluid, W/m2;ΔT1E(t) and Δ T2EIt (t) is the temperature rise of sheet-like plane heat source two layers of material;ΔT1(t) and Δ T2It (t) is sheet Temperature rise analytic solutions of the flat heat source two layers of material within the t time;D rises the difference of temperature rise approximate with analytic solutions for sensor institute's thermometric Value;DacceptFor acceptable difference value threshold value;τ is the fever duration of single measurement heat source, s;α rises and temperature for experiment institute's thermometric Rise analytic solutions temperature rise difference value is minimum or the thermal diffusivity that is calculated in acceptable thresholds, m2/s。
Specific embodiment
Embodiments of the present invention are illustrated by taking the measurement of the moisture content of moisture retentive heat insulation material as an example below.
Heterogeneous content and its method of distribution in a kind of measurement porous material, steps are as follows:
(1) moisture retentive heat insulation material 4 is arranged in weak heat exchange environment, while by the first heat-flow meter sensor 2, sheet-like plane Heat source 1, the second heat-flow meter sensor 3 are arranged and are fitted closely according to Fig. 1 sequence, are arranged in parallel with 4 surface of measured material in material Material is internal, and the parallel distance on sheet-like plane heat source and measured material or so surface is respectively l1And l2.It is recommended that selecting sheet type sheet Flat heat source, sheet sheet type heat-flow meter sensor, while sheet type heat-flow meter sensor area size is flat much smaller than formula sheet The area size of plane heat source.
(2) after waiting the uniformity of temperature profile of moisture retentive heat insulation material to stablize, the initial temperature T of record measurement initial time0
(3) heater circuit is connected, the sheet-like plane heat source that area A, constant heat generation power are Q generates total heat in material Stream is denoted asMeet relationship
(4) temperature and hot-fluid that sheet-like plane heat source side is measured by the first heat-flow meter sensor, are denoted as T1WithBy Two heat-flow meter sensors measure the temperature and hot-fluid of the sheet-like plane heat source other side, are denoted as T2With
(5) initial temperature is subtracted by the first heat-flow meter sensor temperature measurement data, obtains sheet-like plane heat source side heat-flow meter Temperature rise Δ T is corresponded at Sensor1E(t);Initial temperature is subtracted by the second heat-flow meter sensor temperature measurement data, it is flat to obtain sheet Temperature rise value Δ T is corresponded at the heat-flow meter sensor measuring point of the plane heat source other side2E(t);
(6) the sheet-like plane heat source two sides hot-fluid measured according to step (4)WithDetermine total hot-fluidAlong sheet-like plane The distribution coefficient f of heat source two sidesi, in conjunction with the one dimensional heat transfer process Heat Conduction Differential Equations of transient state flat heat source, boundary condition and Primary condition obtains sheet-like plane heat source two sides in heat-flow meter sensor position in the temperature rise analytic solutions Δ T in the t time1(t) and ΔT2(t);
Temperature rise analytic solutions Δ T of the sheet-like plane heat source two layers of material in heat-flow meter sensor position1(t) and Δ T2(t) lead The hot differential equation, boundary condition and primary condition meet:
T=0, Ti=T0 (4)
With reference to H.S.Carlslaw, J.C.Jaeger.Conduction of Heat in Solids.2nd Solutions of Partial Differential Equations group in Edition.Oxford Clarendon Press, 1986:89-112 obtains being measured and monitored the growth of standing timber Expect x=liThe temperature rise analytic solutions on boundary are as follows:
Wherein, footnote i distinguishes sheet-like plane heat source two sides, is sheet-like plane heat source side measuring point when i=1, and when i=2 is Sheet-like plane heat source other side measuring point;TiFor the temperature of measured material, K;T0For the initial temperature of measured material, K;λ is to be measured and monitored the growth of standing timber The thermal coefficient of material, Wm-1K-1;ρ is the density of measured material, kgm-3;C is the specific heat capacity of measured material, Jkg-1K-1;ρ c is quilt Measure and monitor the growth of standing timber the heat capacity of volume (Jm of material-3K-1);fiFor the total hot-fluid determined by heat-flow meter sensorAlong sheet-like plane heat source two sides Distribution coefficient, i.e., For sheet-like plane heat source total hot-fluid, W/m2;liIt is flat for sheet Parallel distance of the plane heat source measuring point to measured material surface, m;α is the thermal diffusivity of measured material, m2/s;
(7) difference value of actual measurement temperature rise and temperature rise analytic solutions obtained by step (5) and step (6) is calculated using formula (8),
Wherein, D is the root mean square difference value (DEG C) of the temperature rise calculated and actual measurement temperature rise, Δ TM,tTo be calculated by formula The temperature rise value (DEG C) of the t moment arrived, Δ TE,tFor by the temperature rise value (DEG C) for testing the t moment measured, n is the temperature that experiment measures Spend data number.One-shot measurement includes two groups of temperature rise data in the present invention, respectively corresponds the temperature at left and right sides of sheet-like plane heat source It rises, therefore calculates corresponding D value at left and right sides of sheet-like plane heat source.
(8) it is optimized using Matlab Optimization Toolbox, passes through the thermally conductive system of Proper Match moisture retentive heat insulation material Number λ and volumetric heat capacity ρ c and thermal diffusivity α, is arranged acceptable deviation Daccept, so that sensor institute's thermometric liter is close with analytic solutions Meet D≤D like the difference value relationship of temperature riseaccept;Wherein, if parameter, which matches, is limited to liquid so that porous material absorbs moisture as an example The thermal coefficient λ and volumetric heat capacity ρ c of state water, matching lower limit are thermal coefficient λ and volumetric heat capacity the ρ c of dry thermal insulation material.
(9) according to obtain Optimum Matching in step (8) as a result, determine absorb it is heterogeneous after porous material thermal coefficient λ and The numerical value of volumetric heat capacity ρ c, according to volumetric heat capacity and the one-to-one relationship of heterogeneous content, be absorbed heterogeneous rear porous material Heterogeneous content, such as the water content in thermal insulation material:
Wherein, xwFor the volume fraction of moisture, ρdryFor the density (kgm of dry thermal insulation material-3), cdryFor dry thermal insulating material Expect specific heat capacity (Jkg-1K-1), ρdrycdryFor the heat capacity of volume (Jm of dry thermal insulation material-3·K-1), cwFor the specific heat capacity of moisture (Jkg-1K-1), ρ c is the resulting volumetric heat capacity (Jm of Optimum Matching-3·K-1)。
(10) point layout and record position parameter of one-dimensional or plane or solid are carried out in material, Fig. 2 is measuring point cloth Schematic diagram is set, is defined by the penetration thickness of thermal perturbation in thermal conduction study in the material it is found that sheet-like plane is warm within a certain period of time Thermal perturbation at source can only transmit limited thickness in measured material, and the material area other than this thickness keeps initial shape State, therefore arranged inside measured material and should ensure that at least one measuring point in penetration thickness when measuring point, avoid measured material Inside there is measurement blind area, the arrangement spacing d of measuring pointiIt should meet:
Wherein;τ is the fever duration of single measurement heat source, s;It is poor with the temperature rise of temperature rise analytic solutions that α rises for experiment institute's thermometric Different thermal diffusivity value minimum or be calculated in acceptance threshold, m2/s;
(11) step (1)~(9) are repeated, the moisture content at available each measuring point two sides are repeatedly measured, by right The data obtained carries out interpolation processing, can obtain the moisture content distribution of certain dimension material Nei.
It is as follows that the used program of numerical interpolation processing is carried out by Matlab:
Uiopen (' data file path ', 1)
[X,Y,Z Xw]=griddata (x, y, z, xw,linspace(0,900,100)',linspace(0.4,5, 100), ' linear') % range
pcolor(X,Y,Z,Xw);Shading interp% pseudocolour picture
hold on
scatter(x,y,z'r')
text(x,y,z,arrayfun(@(xw)[”num2str(xw)],xw, ' UniformOutput', 0)) % label survey Point position and heterogeneous content
H=gca;The pointer of % acquisition present figure coordinate
set(h,'FontSize',16);Text size is arranged in %
(12) it is fitted to obtain the fitting function X that heterogeneous content changes with point position according to datawAnd its distribution:
Xw=(x, y, z, xw) (7)
Wherein, the coordinate that x, y, z are marked in measured material using a certain position as origin by measuring point, m;xwFor measuring point position Set corresponding heterogeneous content.According to fitting function the heterogeneous content in any position in material can be obtained by substituting into location parameter.
Although above in conjunction with attached drawing, invention has been described, and the invention is not limited to above-mentioned specific implementations Mode, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art are at this Under the enlightenment of invention, without deviating from the spirit of the invention, many variations can also be made, these belong to of the invention Within protection.

Claims (5)

1. heterogeneous content and its method of distribution in a kind of measurement porous material, which is characterized in that step are as follows:
(1) the first heat-flow meter sensor, sheet-like plane heat source, the second heat-flow meter sensor are arranged in order and keep it mutually tight Closely connected conjunction is arranged in parallel with measured material surface in material internal;
(2) recording stable and equally distributed temperature in measured material is initial temperature T0
(3) heater circuit is connected, the sheet-like plane heat source that area A, constant heat generation power are Q generates total hot-fluid note in material ForMeet relationship
(4) temperature and hot-fluid that sheet-like plane heat source side is measured by the first heat-flow meter sensor, are denoted as T1WithBy the second heat Flowmeter sensor measures the temperature and hot-fluid of the sheet-like plane heat source other side, is denoted as T2With
(5) initial temperature is subtracted by the first heat-flow meter sensor temperature measurement data, obtains sheet-like plane heat source side heat-flow meter sensing Temperature rise Δ T is corresponded at device measuring point1E(t);Initial temperature is subtracted by the second heat-flow meter sensor temperature measurement data, obtains sheet-like plane heat Temperature rise value Δ T is corresponded at the heat-flow meter sensor measuring point of the source other side2E(t);
(6) the sheet-like plane heat source two sides hot-fluid measured according to step (4)WithDetermine total hot-fluidAlong sheet-like plane heat source The distribution coefficient f of two sidesi, i.e.,In conjunction with the one dimensional heat transfer process of transient state flat heat source Heat Conduction Differential Equations, boundary condition and primary condition obtain sheet-like plane heat source two layers of material in heat-flow meter sensor position In the temperature rise analytic solutions Δ T in the t time1(t) and Δ T2(t);
Temperature rise analytic solutions Δ T of the sheet-like plane heat source two layers of material in heat-flow meter sensor position1(t) and Δ T2(t) thermally conductive micro- Equation, boundary condition and primary condition is divided to meet:
T=0, Ti=T0 (4)
With reference to H.S.Carlslaw, J.C.Jaeger.Conduction of Heat in Solids.2nd Solutions of Partial Differential Equations group in Edition.Oxford Clarendon Press, 1986:89-112 obtains being measured and monitored the growth of standing timber Expect x=liThe temperature rise analytic solutions on boundary are as follows:
Wherein, footnote i distinguishes sheet-like plane heat source two sides, is sheet-like plane heat source side measuring point when i=1, and when i=2 is sheet Flat heat source other side measuring point;TiFor the temperature of measured material, K;T0For the initial temperature of measured material, K;λ is measured material Thermal coefficient, Wm-1K-1;ρ is the density of measured material, kgm-3;C is the specific heat capacity of measured material, Jkg-1K-1;ρ c is to be measured and monitored the growth of standing timber Heat capacity of volume (the Jm of material-3K-1);fiFor the total hot-fluid determined by heat-flow meter sensorPoint along sheet-like plane heat source two sides Distribution coefficient, i.e., For sheet-like plane heat source total hot-fluid, W/m2;liFor sheet-like plane Parallel distance of the heat source measuring point to measured material surface, m;α is the thermal diffusivity of measured material, m2/s;
(7) the temperature rise value Δ T of middle the surveyed sheet-like plane heat source two sides of comparison step (5)1E(t)、ΔT2E(t) with it is right in step (6) Answer the temperature rise analytic solutions Δ T of position measuring point1(t)、ΔT2(t), the thermal physical property parameter in transform analysis solution makes to test institute's thermometric liter With the temperature rise difference value minimum of temperature rise analytic solutions or in acceptable thresholds, the thermally conductive system of sheet-like plane heat source two sides is obtained at this time The numerical value of number λ, heat capacity of volume ρ c and thermal diffusivity α;
(8) according to the one-to-one relationship of the volumetric heat capacity ρ c of measured material and the heterogeneous content of measured material, sheet-like plane is calculated The heterogeneous content of heat source two layers of material;
(9) since each test data can only represent the heterogeneous content in the limited transmitting thickness of Transient Heat Transfer, with spacing distance diCloth It sets measuring point, repeats step (1)~(8) and heterogeneous content measurement is carried out to different measuring points, according to gained point position and corresponding different Matter content, carries out data processing to institute's measured data by data processing software, obtains certain in material according to specific measurement request The non-uniform heterogeneous content distribution of dimension.
2. heterogeneous content and its method of distribution in a kind of measurement porous material according to claim 1, which is characterized in that logical Crossing step (4) may determine that whether the heterogeneous content distribution in sheet-like plane heat source two sides is uniform: whenWhen, sheet is flat Heterogeneous content distribution is uniform at material measuring point at left and right sides of plane heat source;WhenWhen, sheet-like plane heat source left and right sides material Expect that heterogeneous content distribution is uneven at measuring point.
3. heterogeneous content and its method of distribution in a kind of measurement porous material according to claim 1, which is characterized in that step Suddenly it is defined by the penetration thickness of thermal perturbation in thermal conduction study in the material it is found that certain when design point layout scheme in (9) Thermal perturbation in time at sheet flat heat source can only transmit limited thickness in measured material, and the material other than this thickness Expect that region keeps original state, therefore is arranged inside measured material and should ensure that at least one is surveyed in penetration thickness when measuring point Point, avoids in measured material that there are measurement blind area, the arrangement spacing d of measuring pointiIt should meet:
Wherein;τ is the duration of single measurement heat source fever, s;α rises the temperature rise difference value with temperature rise analytic solutions for experiment institute's thermometric Thermal diffusivity minimum or being calculated in acceptance threshold, m2/s。
4. heterogeneous content and its method of distribution in a kind of measurement porous material according to claim 1, which is characterized in that step Suddenly various dimensions survey can be carried out in measured material according to the specific requirement of heterogeneous distribution measuring when design point layout scheme in (9) Point, which is arranged, simultaneously records point position parameter, corresponding to obtain heterogeneous one-dimensional, plane or three-dimensional distribution in measured material.
5. heterogeneous content and its method of distribution in a kind of measurement porous material according to claim 1, which is characterized in that step Suddenly the data processing in (9) be to measuring the heterogeneous content of resulting multiple groups and corresponding position parameter carries out interpolation processing, by Input data and write corresponding interpolation processing program in data processing software, can get heterogeneous content in measured material it is one-dimensional, Plane or three-dimensional distribution situation can be fitted to obtain in measured material heterogeneous content according to interpolation result and intend with what point position change Close function XwAnd its distribution:
Xw=(x, y, z, xw) (7)
Wherein, the coordinate that x, y, z are marked in measured material using a certain position as origin by measuring point, m;xwFor point position ginseng The corresponding heterogeneous content of number.According to fitting function the heterogeneous content in any position in material can be obtained by substituting into location parameter.
CN201910442695.1A 2019-05-25 2019-05-25 Method for measuring heterogeneous content and distribution in porous material Active CN110174434B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910442695.1A CN110174434B (en) 2019-05-25 2019-05-25 Method for measuring heterogeneous content and distribution in porous material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910442695.1A CN110174434B (en) 2019-05-25 2019-05-25 Method for measuring heterogeneous content and distribution in porous material

Publications (2)

Publication Number Publication Date
CN110174434A true CN110174434A (en) 2019-08-27
CN110174434B CN110174434B (en) 2021-12-07

Family

ID=67695913

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910442695.1A Active CN110174434B (en) 2019-05-25 2019-05-25 Method for measuring heterogeneous content and distribution in porous material

Country Status (1)

Country Link
CN (1) CN110174434B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110907494A (en) * 2019-12-12 2020-03-24 河南科技大学 Detection system and detection method for detecting heat distribution coefficient of friction pair
CN113804720A (en) * 2020-06-16 2021-12-17 瑟姆泰斯公司 Method for characterizing, differentiating and measuring contact areas
CN114754717A (en) * 2022-03-21 2022-07-15 天津大学 Method for measuring thickness of ice layer based on thermal principle

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5297868A (en) * 1993-06-23 1994-03-29 At&T Bell Laboratories Measuring thermal conductivity and apparatus therefor
CN101126729A (en) * 2007-09-18 2008-02-20 南京航空航天大学 Double heat flux gauge steady state method for measuring material heat conductivity
CN101251502A (en) * 2008-04-09 2008-08-27 东华大学 Apparatus and method for measuring textile heat conduction, thermal diffusivity and volumetric heat capacity
CN201749096U (en) * 2010-07-01 2011-02-16 青岛海洋地质研究所 Thermal diffusion effect experiment device of natural gas hydrate in porous media
CN103630569A (en) * 2013-10-28 2014-03-12 大连理工大学 Method for measuring heterogeneous medium content of material based on volume thermal mass
CN104569045A (en) * 2015-01-14 2015-04-29 北京工业大学 Method and device for testing thermal contact resistance of joint surfaces between cylindrical sleeve walls
CN104597078A (en) * 2015-01-14 2015-05-06 北京科技大学 Method for measuring anisotropic material heat conductivity based on small-plane heat source
CN104964997A (en) * 2015-03-12 2015-10-07 大连理工大学 Method for quickly determining content of heterogeneous media in material based on physical property matching
CN108490024A (en) * 2018-03-28 2018-09-04 大连理工大学 A method of the heterogeneous content of limited thickness material is measured based on fictitious heat source principle
CN109738484A (en) * 2019-01-29 2019-05-10 天津大学 Device and method based on heterogeneous content in sheet-like plane heat source measurement porous material

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5297868A (en) * 1993-06-23 1994-03-29 At&T Bell Laboratories Measuring thermal conductivity and apparatus therefor
CN101126729A (en) * 2007-09-18 2008-02-20 南京航空航天大学 Double heat flux gauge steady state method for measuring material heat conductivity
CN101251502A (en) * 2008-04-09 2008-08-27 东华大学 Apparatus and method for measuring textile heat conduction, thermal diffusivity and volumetric heat capacity
CN201749096U (en) * 2010-07-01 2011-02-16 青岛海洋地质研究所 Thermal diffusion effect experiment device of natural gas hydrate in porous media
CN103630569A (en) * 2013-10-28 2014-03-12 大连理工大学 Method for measuring heterogeneous medium content of material based on volume thermal mass
CN104569045A (en) * 2015-01-14 2015-04-29 北京工业大学 Method and device for testing thermal contact resistance of joint surfaces between cylindrical sleeve walls
CN104597078A (en) * 2015-01-14 2015-05-06 北京科技大学 Method for measuring anisotropic material heat conductivity based on small-plane heat source
CN104964997A (en) * 2015-03-12 2015-10-07 大连理工大学 Method for quickly determining content of heterogeneous media in material based on physical property matching
CN108490024A (en) * 2018-03-28 2018-09-04 大连理工大学 A method of the heterogeneous content of limited thickness material is measured based on fictitious heat source principle
CN109738484A (en) * 2019-01-29 2019-05-10 天津大学 Device and method based on heterogeneous content in sheet-like plane heat source measurement porous material

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
沈润霖 等: "测量多孔材料含水/含冰量的热线法", 《建筑热能通风空调》 *
罗云 等: "快速测定多孔保温材料含水量的温度匹配法", 《建筑热能通风空调》 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110907494A (en) * 2019-12-12 2020-03-24 河南科技大学 Detection system and detection method for detecting heat distribution coefficient of friction pair
CN110907494B (en) * 2019-12-12 2022-02-15 河南科技大学 Detection system and detection method for detecting heat distribution coefficient of friction pair
CN113804720A (en) * 2020-06-16 2021-12-17 瑟姆泰斯公司 Method for characterizing, differentiating and measuring contact areas
CN113804720B (en) * 2020-06-16 2024-04-02 瑟姆泰斯公司 Method for characterizing, distinguishing and measuring contact areas
CN114754717A (en) * 2022-03-21 2022-07-15 天津大学 Method for measuring thickness of ice layer based on thermal principle
CN114754717B (en) * 2022-03-21 2023-02-24 天津大学 Method for measuring thickness of ice layer based on thermal principle

Also Published As

Publication number Publication date
CN110174434B (en) 2021-12-07

Similar Documents

Publication Publication Date Title
CN110174434A (en) Heterogeneous content and its method of distribution in a kind of measurement porous material
CN108490024A (en) A method of the heterogeneous content of limited thickness material is measured based on fictitious heat source principle
CN201503406U (en) Improved flat plate instrument for testing thermal performance of fabric
CN104180929B (en) A kind of calibration steps of TR heat flow transducer
CN101126729A (en) Double heat flux gauge steady state method for measuring material heat conductivity
CN101246137A (en) Method for detecting heat transfer resistance/heat transfer factor of building enclosure structure by infrared thermal imaging system
CN105548246B (en) Steady state method thermal conductivity measurement experimental system and measuring method
CN104280419A (en) Method for testing material heat conductivity coefficient through transient plane heat source method
CN103760189A (en) Measurement method for separation of convection heat and radiant heat for wall surface
CN103454306A (en) Detection and measurement method for heat conduction coefficient tester
CN103207207A (en) Testing device for thermal resistance of bedding and clothing
CN203798759U (en) Glass thermophysical property tester
CN106124078A (en) A kind of method using double-thermocouple to measure strong transient fluid temperature
CN104964997A (en) Method for quickly determining content of heterogeneous media in material based on physical property matching
Nassiopoulos et al. On-site building walls characterization
CN103675018A (en) Fabric thermal property tester
CN206847820U (en) A kind of temperature measuring equipment in temperature field
CN208953164U (en) Thermal resistance heat flow transducer calibrating installation
CN211014087U (en) Simulation detection device for heat dissipation effect of low-thermal-resistance cable filling medium
CN109324079B (en) Material thermal expansion coefficient measuring method based on ultrasound
CN109738484A (en) Device and method based on heterogeneous content in sheet-like plane heat source measurement porous material
CN105372288A (en) Heat flow rate measuring instrument and measuring method
CN113551778B (en) Thermal imaging system relative temperature measurement performance evaluation device
CN109580708A (en) The voltage measurement method of the hot physical property of heat-pole method instantaneous measurement material
CN111735847B (en) Real-time online measuring device and method for two-dimensional surface heat flux density

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant