CN109738484A - Device and method based on heterogeneous content in sheet-like plane heat source measurement porous material - Google Patents
Device and method based on heterogeneous content in sheet-like plane heat source measurement porous material Download PDFInfo
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Abstract
The invention discloses a kind of device and methods based on heterogeneous content in sheet-like plane heat source measurement porous material, and device includes sheet-like plane heat source, data acquisition device and computer data processing system；Data acquisition device includes temperature sensor, AD modulus conversion chip and data collecting card, and temperature sensor connects AD modulus conversion chip, and AD modulus conversion chip connects data collecting card, and data collecting card is connected with computer data processing system.Adsorbent By Using Transient Plane Source Technique is applied in porous material in the test of heterogeneous content by the present invention, is placed in the heterogeneous content of porous material internal measurement by the way of sheet-like plane heat source and the preparatory permanent adhesive of temperature sensor.Heater is bonded arrangement with temperature element, required heating amount relatively before calorifics method the problem of greatly reducing, also influencing measuring accuracy there is no distance change between heat source body and temperature element.The miniaturization precise measurement of heterogeneous content in porous material can be achieved in the invention, and method is simply, quick and precisely.
Description
Technical field
The invention belongs to material tests analysis fields, are related to a kind of based on heterogeneous in sheet-like plane heat source measurement porous material
The device and method of content.
Background technique
If containing foreign elements in porous material, will affect the hot physical property of porous material, heat insulating ability to porous material and
Durability also has a great impact.For example, the moisture gathered in porous insulation material under wet environment not only deteriorates heat insulation effect,
The microorganisms such as the mould bred therefrom, also cause to corrode to material.There is at present the detection of foreign elements content in porous material
Electric method, calorifics method, ray method etc..Wherein calorifics method is relatively simple cheap, and moisture saliferous containing ingredients such as acid to calorifics method
Measuring accuracy influences little.Calorifics method setting threadiness or column heat source in tested porous material, monitor away from heat source fixed range
Material in certain point transient temperature rise, and resolve tested porous material volumetric heat capacity in the variable quantity for absorbing heterogeneous front and back, in turn
It is inferred to heterogeneous content.
The current calorifics method measurement heterogeneous content of material has the disadvantage in that (1) since heater is separated with temperature point
Arrangement, when test, need to provide biggish calorific value, could generate in temperature measuring point and be easy detected effective temperature rise, and due to quilt
It measures and monitor the growth of standing timber the porous nature of material, big calorific value will induce free convection and radiant heat transfer in material internal, and have to measuring accuracy larger
Influence.(2) current calorifics method requires distance between heater and temperature measuring point to fix, and in the actual operation process, it is any
The miniature deformation for operating support construction between deviation or heater and support temperature measuring point, all affects measured heterogeneous content
Precision.
The present invention proposes heater and temperature element being placed in integrated sheet-like plane heat resource method, to test in porous material
Heterogeneous content.This method is used as heat source using laminar electric heating device (such as Electric radiant Heating Film), generates after electrified regulation
Transient temperature rise is measured by the film-form temperature element (such as membranaceous thermoelectricity occasionally thermal resistance) for being attached at heat source surface, according to record
Temperature rise response be inferred to thermal physical property parameter variation of the material before and after heterogeneous intrusion, and then calculate heterogeneous contained by material
Content.Since heater is bonded arrangement with temperature element, required heating amount is greatly reduced, and also there is no heat source bodies and thermometric member
Between part the problem of distance change.
Summary of the invention
The object of the present invention is to provide it is a kind of based on sheet heat source measurement porous material in heterogeneous content device and method,
It is unstable to solve heterogeneous measurement result in the prior art, the problem of measuring accuracy difference.
In order to achieve the above objectives, technical solution of the present invention:
A kind of device based on heterogeneous content in sheet-like plane heat source measurement porous material, including sheet-like plane heat source, number
According to acquisition device and computer data processing system；Sheet-like plane heat source is connected with heater circuit；Data acquisition device includes temperature
Sensor, AD modulus conversion chip and data collecting card are spent, temperature sensor connects AD modulus conversion chip, AD analog-to-digital conversion core
Piece connects data collecting card, and data collecting card is connected with computer data processing system.Or it is similar can be by temperature sensor
The electric signal of acquisition is converted to the processing unit of temperature data.
It is made of inside sheet-like plane heat source the resistive conductor after arranging, material can be nickel alloy, flaky；Heat source is connected
Stable low-heat current density is generated after heater circuit with firm power, porous material is internally heated；Temperature sensor is in
Flake, can be thin film thermoelectric occasionally thermal resistance, temperature sensor and flat heat source bonding in advance, and integralization is placed in porous material
Heterogeneous content measurement is carried out in material.Computer data processing system includes the temperature rise number of temperature measuring point in online record porous material
According to Data Post program and the algorithm for calculating the heterogeneous content of porous media.
The present invention provides a kind of method based on heterogeneous content in flat heat source measurement porous material, step are as follows:
A, it is integrated the bonding of both temperature sensor and sheet-like plane heat source；
B, temperature sensor and sheet-like plane heat source that bonding is integrated are arranged in inside tested porous material；
C, log-on data acquisition device, after tested porous material internal temperature is stablized, record at this time temperature as tested
The initial temperature of porous material；
D, heater circuit is connected, is changed by the temperature rise of data acquisition device online record sheet-like plane heat source；
E, it closes heater circuit and data acquisition device, data processing system post-processes temperature measurement data；
F, it calculates thermal physical property parameter using default calculation procedure and resolves and obtain heterogeneous content.
Compared with heterogeneous content method in existing unstable state heat-pole method measurement material and device, of the invention further changes
Into being:
1. heating amount needed for heat source greatly reduces due to sheet-like plane heat source and temperature element integrated arrangement, reduce
Interference to test result of free convection and radiant heat transfer caused by generating heat；
2. the sheet-like plane heat source and temperature element of integrated arrangement, the sensitivity and accuracy for also measuring temperature are obtained
Very big promotion；
3. sheet-like plane heat source and temperature sensor make pre-bonded processing, when avoiding multiple measurement sheet flat heat source with
Temperature sensor distance is not fixed caused error.
Adsorbent By Using Transient Plane Source Technique is applied in porous material in the test of heterogeneous content by the present invention, using sheet-like plane heat
The mode of source and temperature sensor bonding in advance is placed in the heterogeneous content of porous material internal measurement, it can be achieved that heterogeneous in porous material
The miniaturization integrated measuring of content, measurement method cheap and simple, quick and precisely.
Detailed description of the invention
Fig. 1 is that a kind of device for measuring heterogeneous content in porous material based on sheet-like plane heat source provided by the invention shows
It is intended to；In figure；1 is sheet-like plane heat source；2 be temperature sensor；3 be tested porous material；4 be heater circuit；5 be AD modulus
Conversion chip；6 be data collecting card；7 be computer data processing system；
Fig. 2 is a kind of stream that the method for heterogeneous content in porous material is measured based on sheet-like plane heat source provided by the invention
Cheng Tu.
Specific embodiment
The present invention is illustrated below in conjunction with example.
As shown in Figure 1, to be provided by the invention a kind of based on heterogeneous content in sheet-like plane heat source measurement porous material
The schematic diagram of device.The sheet-like plane heat source 1 and temperature sensor 2 of bonding in advance are arranged in tested porous material, sheet is flat
Plane heat source 1 uses electric heating piece, and temperature sensor 2 uses film thermocouple, and sheet-like plane heating source area is than temperature sensor area
Size is much bigger, and integration is placed in tested porous material 3；When starting test, by temperature sensor 2 and AD modulus conversion chip
5 are connected, and AD modulus conversion chip 5 is connected with data collecting card 6, realize conversion of the voltage signal to digital signal, and will acquisition
Temperature data be sent to computer data processing system 7；Temperature data is observed, porous material internal temperature to be tested is stablized
Afterwards, initial temperature of the temperature as tested porous material at this time is recorded；Heater circuit 4 is opened, sheet-like plane heat source 1 is made to generate perseverance
Determine Uniform Heat, and temperature rise variation in temperature measuring point position is monitored by temperature sensor 2, reads, deposits through computer data processing system
Storage and calculating matching, finally obtain heterogeneous content in porous material.
The corresponding one-dimensional heat conduction differential equation of device to test provided by the present invention, boundary condition and primary condition are as follows:
When
When
Work as t=0, T=T0 (4)
Wherein, T is the temperature of tested porous material, K；T0For the initial temperature for being tested porous material, K；λ is porous to be tested
The thermal coefficient of material, Wm-1K-1；ρ is the density of tested porous material, kgm-3；C is the specific heat capacity of tested porous material, Jkg- 1K-1；ρ c is the heat capacity of volume (Jm of tested porous material-3K-1)；For sheet-like plane heat under symmetrical heat transfer situation
The unilateral heat dissipation heat flow density in source, W/m2；Q is flat heat source input general power, W；A is sheet-like plane heating source area, m2；L is quilt
Survey the thickness of porous material, m；
With reference to H.S.Carlslaw, J.C.Jaeger.Conduction of Heat in Solids.2nd
Method in Edition.Oxford Clarendon Press, 1986:89-112 solves above-mentioned partial differential equations, obtain by
Survey the temperature rise analytic solutions on the boundary porous material x=l are as follows:
Wherein, α is thermal diffusivity, m2/s；
The thermal coefficient λ of the tested porous material assumed and the heat capacity of volume ρ c of tested porous material are substituted into, then can be calculated
The temperature rise Δ T of moment temperature measuring point is corresponded to outM,i, the calculating of temperature rise can be by related software such as Matlab.Wherein it is tested porous material
Hypothesis thermal conductivity value, when being to dry the thermal conductivity value of porous material and the thermal conductivity value of moisture as bound,
Pass through exhaustive method value；The heat capacity of volume of tested porous material similarly obtained value, it can obtaining tested porous material may
Thermal coefficient and heat capacity of volume combination.
Gained temperature rise Δ T will be calculated by analytic solution under a certain hypothesis thermal coefficient and heat capacity of volume combinationM,iWith institute's thermometric liter
ΔTE,iIt compares, the difference value of the temperature rise and actual measurement temperature rise that must be calculated using formula (6),
Wherein, D is the root mean square difference value (DEG C) of the temperature rise calculated and actual measurement temperature rise, Δ TM,iTo be calculated by formula
The temperature rise value (DEG C) at the i moment arrived, Δ TE,iFor by the temperature rise value (DEG C) for testing the i moment measured, n is the temperature that experiment measures
Spend data number.With acceptable discrepancy threshold DacceptFor selection criteria, then D≤D can be obtainedacceptWhen, it is tested porous material
Heat capacity of volume range, wherein (ρ c)minFor the lower limit minimum value for meeting the heat capacity of volume for matching desired tested porous material, (ρ
c)maxFor the upper limit maximum volume thermal capacitance for meeting the heat capacity of volume for matching desired tested porous material.
Heat capacity of volume and heterogeneous content (for moisture) relationship are as follows:
ρdrycdry+ρwcwxw=ρ c (7)
Wherein, ρdryTo be tested the heterogeneous preintrusive dry density (kgm of porous material-3), cdryIt is different for tested porous material
The preintrusive dry specific heat capacity (Jkg of matter-1K-1), ρdrycdryHeat capacity of volume when being dry before the tested heterogeneous intrusion of porous material
(Jm-3·K-1), ρwFor the density (kgm of moisture-3), ρwFor the specific heat capacity (Jkg of moisture-1K-1), ρwcwFor the heat capacity of volume of moisture
(Jm-3·K-1), xwFor the volume fraction of moisture, ρ c is the heat capacity of volume (Jm of tested porous material-3·K-1)。
According to the bound of heat capacity of volume, the bound of the volume fraction of moisture is sought:
Wherein, xmaxFor the maximum value of heterogeneous volume content, xminFor the minimum value of heterogeneous volume content.
The range of the mass fraction of moisture in tested porous material:
Wherein, ymaxFor the maximum value of heterogeneous mass content, yminFor the minimum value of heterogeneous mass content.
That is (xmin, xmax) it is the range for solving gained water content volume content, (ymin, ymax) it is to solve gained water content matter
Measure the range of content.
Claims (6)
1. a kind of device based on heterogeneous content in sheet-like plane heat source measurement porous material, including sheet-like plane heat source, data
Acquisition device and computer data processing system；Sheet-like plane heat source is connected with heater circuit；Data acquisition device includes temperature
Sensor, AD modulus conversion chip and data collecting card, temperature sensor connect AD modulus conversion chip, AD modulus conversion chip
Data collecting card is connected, data collecting card is connected with computer data processing system.Or similar temperature sensor can be adopted
The electric signal of collection is converted to the processing unit of temperature data to replace above-mentioned data acquisition device.
2. the device according to claim 1 based on heterogeneous content in sheet-like plane heat source measurement porous material, feature exist
In: it is made of inside sheet-like plane heat source the resistive conductor after arranging, material can be nickel alloy, flaky.
3. the device according to claim 1 based on heterogeneous content in sheet-like plane heat source measurement porous material, feature exist
In: the temperature sensor is thin film thermoelectric occasionally thermal resistance, flaky.
4. the device according to claim 1 based on heterogeneous content in sheet-like plane heat source measurement porous material, feature exist
In: the temperature sensor and sheet-like plane heat source bonding in advance, it is heterogeneous containing measurement that integralization is placed in progress in porous material
Amount.
5. a kind of method based on heterogeneous content in sheet-like plane heat source measurement porous material, which is characterized in that step are as follows:
A, it is integrated the bonding of both temperature sensor and sheet-like plane heat source；
B, temperature sensor and sheet-like plane heat source that bonding is integrated are arranged in inside tested porous material；
C, log-on data acquisition device, after tested porous material internal temperature is stablized, temperature is porous as being tested at this time for record
The initial temperature of material；
D, heater circuit is connected, is changed by the temperature rise of data acquisition device online record sheet-like plane heat source；
E, it closes heater circuit and data acquisition device, data processing system post-processes temperature measurement data；
F, it calculates thermal physical property parameter using default calculation procedure and resolves and obtain heterogeneous content.
6. the method according to claim 5 based on heterogeneous content in sheet-like plane heat source measurement porous material, feature exist
In, the step e data processing, Heat Conduction Differential Equations, boundary condition and the primary condition of the one dimensional heat transfer process are as follows:
Work as x=l,
Work as x=0,
Work as t=0, T=T0 (4)
Wherein, T is the temperature of tested porous material, K；T0For the initial temperature for being tested porous material, K；λ is tested porous material
Thermal coefficient, Wm-1K-1；ρ is the density of tested porous material, kgm-3；C is the specific heat capacity of tested porous material, Jkg-1K-1；
ρ c is the heat capacity of volume (Jm of tested porous material-3K-1)；For sheet flat heat source under symmetrical heat transfer situation
Unilateral side heat dissipation heat flow density, W/m2；Q is flat heat source input general power, W；A is sheet-like plane heating source area, m2；L is tested more
The thickness of Porous materials, m；
With reference to H.S.Carlslaw, J.C.Jaeger.Conduction of Heat in Solids.2nd
Method in Edition.Oxford Clarendon Press, 1986:89-112 solves above-mentioned partial differential equations, obtain by
Survey the temperature rise analytic solutions on the boundary porous material x=l are as follows:
Wherein, α is thermal diffusivity, m2/s；
The thermal coefficient λ of the tested porous material assumed and the heat capacity of volume ρ c of tested porous material are substituted into, then can be calculated pair
Answer the temperature rise Δ T of moment temperature measuring pointM,i, the calculating of temperature rise can be by related software such as Matlab.Wherein it is tested the vacation of porous material
Determine thermal conductivity value, the thermal conductivity value of porous material and the thermal conductivity value of moisture pass through as bound when being to dry
Exhaustive method value；The heat capacity of volume of tested porous material similarly obtained value, it can obtain that tested porous material is possible leads
The combination of hot coefficient and heat capacity of volume.
Gained temperature rise Δ T will be calculated by analytic solution under a certain hypothesis thermal coefficient and heat capacity of volume combinationM,iΔ is risen with institute's thermometric
TE,iIt compares, the difference value of the temperature rise and actual measurement temperature rise that must be calculated using formula (6),
Wherein, D is the root mean square difference value (DEG C) of the temperature rise calculated and actual measurement temperature rise, Δ TM,iFor the i being calculated by formula
The temperature rise value (DEG C) at moment, Δ TE,iFor by the temperature rise value (DEG C) for testing the i moment measured, n is the temperature data that experiment measures
Number.With acceptable discrepancy threshold DacceptFor selection criteria, then D≤D can be obtainedacceptWhen, it is tested the volumetric heat of porous material
Hold range, wherein (ρ c)minFor the lower limit minimum value for meeting the heat capacity of volume for matching desired tested porous material, (ρ c)maxFor
Meet the upper limit maximum volume thermal capacitance of the heat capacity of volume for the tested porous material that matching requires.
Heat capacity of volume and heterogeneous content (for moisture) relationship are as follows:
ρdrycdry+ρwcwxw=ρ c (7)
Wherein, ρdryTo be tested the heterogeneous preintrusive dry density (kgm of porous material-3), cdryTo be tested, porous material is heterogeneous to be invaded
Drying specific heat capacity (Jkg before entering-1K-1), ρdrycdryHeat capacity of volume (Jm when being dry before the tested heterogeneous intrusion of porous material-3·K-1), ρwFor the density (kgm of moisture-3), ρwFor the specific heat capacity (Jkg of moisture-1K-1), ρwcwFor the heat capacity of volume (Jm of moisture-3·K-1), xwFor the volume fraction of moisture, ρ c is the heat capacity of volume (Jm of tested porous material-3·K-1)。
According to the bound of heat capacity of volume, the bound of the volume fraction of moisture is sought:
Wherein, xmaxFor the maximum value of heterogeneous volume content, xminFor the minimum value of heterogeneous volume content.
The range of the mass fraction of moisture in tested porous material:
Wherein, ymaxFor the maximum value of heterogeneous mass content, yminFor the minimum value of heterogeneous mass content.
That is (xmin, xmax) it is the range for solving gained water content volume content, (ymin, ymax) it is to solve gained water content quality to contain
The range of amount.
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| CN110174434A (en) * | 2019-05-25 | 2019-08-27 | 天津大学 | Heterogeneous content and its method of distribution in a kind of measurement porous material |
| CN110967368A (en) * | 2019-10-10 | 2020-04-07 | 天津大学 | Device and method for measuring heterogeneous content in porous material |
| CN111487282A (en) * | 2020-05-18 | 2020-08-04 | 天津大学 | Device and method for measuring heterogeneous content in porous material with limited thickness |
| CN112240894A (en) * | 2020-10-15 | 2021-01-19 | 中国商用飞机有限责任公司 | Heat-insulation sound-insulation layer water content detection device and method based on sheet-shaped sensor |
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| CN112240894A (en) * | 2020-10-15 | 2021-01-19 | 中国商用飞机有限责任公司 | Heat-insulation sound-insulation layer water content detection device and method based on sheet-shaped sensor |
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