CN107843347A - A kind of porous media three dimensional temperature distribution measurement method - Google Patents
A kind of porous media three dimensional temperature distribution measurement method Download PDFInfo
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- CN107843347A CN107843347A CN201711100574.6A CN201711100574A CN107843347A CN 107843347 A CN107843347 A CN 107843347A CN 201711100574 A CN201711100574 A CN 201711100574A CN 107843347 A CN107843347 A CN 107843347A
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- 238000000691 measurement method Methods 0.000 title claims abstract description 10
- 238000009825 accumulation Methods 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000012546 transfer Methods 0.000 claims abstract description 10
- 230000001052 transient effect Effects 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 239000000523 sample Substances 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000001931 thermography Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 102000016938 Catalase Human genes 0.000 description 1
- 108010053835 Catalase Proteins 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005311 nuclear magnetism Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011257 shell material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
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Abstract
The present invention proposes a kind of porous media three dimensional temperature distribution measurement method, thermophysical parameter and the thermal center (-tre) temperature such as the effective thermal conductivity using transient heat conduct coefficient measuring device on-line measurement accumulation porous media, while utilize the hull-skin temperature distribution of non-contact temperature measuring device and technology measurement accumulation porous media；Finally solve to obtain three-dimensional temperature field according to the Heat Conduction Differential Equations group and uniqueness condition of foundation.The present invention uses Transient Method on-line measurement effective thermal conductivity, is not disturbed, can completed online by chemical reaction；Using non-contact temperature measuring, non-contact temperature measuring interference can be reduced and eliminated；The Heat Conduction Differential Equations group for gaining knowledge to obtain using heat transfer is useful in different field and physical background, and calculation error is smaller.The present invention can be widely used in the temperature survey for being related to miniature scale porous media and Study on Heat and Mass Transfer.
Description
Technical field
The present invention relates to a kind of porous media three dimensional temperature distribution measurement method, particularly a kind of miniature scale that is used for is accumulated
The three dimensional temperature distribution measurement method of porous media.
Background technology
All the time, the Study on Heat and Mass Transfer of porous media is heat and mass field focus of attention and difficult point, at present, especially
Its less document is related to the temperature survey of porous media, and miniature scale greatly improves difficulty, relative to general yardstick
For, miniature scale greatly improves difficulty, and contact temperature-measuring can produce relatively large interference and error, and easily move
Dynamic position, while non-contact temperature measuring is light tight, nuclear-magnetism, chromatography and magnetic scanning thermometry are much also immature, and cost is very
Height, therefore the measurement for miniature scale porous media three-dimensional temperature field is difficult.
The content of the invention
Present invention aim to address the defects of prior art, there is provided one kind is applied to miniature scale accumulation porous media three
Tie up temperature distribution measuring method.
The technical scheme is that the three dimensional temperature distribution of miniature scale accumulation porous media is measured, including following step
Suddenly, first in the thermal center (-tre) of accumulation porous media（Geometric center）Transient heat conduct coefficient measuring device is arranged, is accumulating porous Jie
The surrounding arrangement non-contact temperature measuring device of matter；Then transient heat conduct coefficient measuring device on-line measurement accumulation porous media is utilized
The thermal center (-tre) temperature of the thermophysical parameters such as effective thermal conductivity and accumulation porous media, while utilize non-contact temperature measuring device and skill
The hull-skin temperature distribution of art measurement accumulation porous media；Finally, the effective thermal conductivity that is obtained based on above-mentioned steps, thermal center (-tre)
The thermophysical parameters such as temperature and hull-skin temperature distribution, solve to obtain according to the Heat Conduction Differential Equations group and uniqueness condition of foundation
Accumulate the three-dimensional temperature field of porous media.
The transient heat conduct coefficient measuring device can be the dress of the measurement of instability thermal conductivity factor such as sonde method and heat-pole method
Put.
The non-contact temperature measuring device can be the device of the non-contact method such as thermal infrared imager measurement temperature distribution.
The Heat Conduction Differential Equations group and uniqueness condition are according to heat transfer theory, according to the geometry of accumulation porous media
What model and physical model were established, and mathematical analysis method and Numerical Methods Solve can be passed through.
The invention has the advantages that the present invention uses the effective thermal conductivity of Transient Method on-line measurement porous media, no
Disturbed by chemical reaction, it is online to complete test, do not influenceed by porous media stacking states；Using non-contact temperature measuring, thermometric is improved
Precision, Temperature Distribution can be obtained without contact thermometric of layouting, non-contact temperature measuring interference can be reduced and eliminate, not by small chi
Degree limitation, temperature measurement accuracy are high；The Heat Conduction Differential Equations group for gaining knowledge to obtain using heat transfer is applicable in different field and physical back
The porous media of scape, Mathematical can arrive analytic solutions, even if challenge also can obtain numerical solution, method mature and reliable, meter
It is smaller to calculate error.The present invention can be widely used in the temperature survey for being related to miniature scale porous media and heat and mass is ground
Study carefully.
Brief description of the drawings
Accompanying drawing 1 is the principle schematic of the embodiment of the present invention.
Accompanying drawing 2 is the thermography at different moments that the embodiment of the present invention obtains.
Accompanying drawing 3 is the surface temperature distribution for the typical time that the embodiment of the present invention obtains.
Accompanying drawing 4 is the three dimensional temperature distribution for the typical time that the embodiment of the present invention obtains.
Wherein, 1, probe, 2, infrared thermal imagery instrument probe, 3, microresponse device, 4, thermostat, 5, sampling valve, 6, constant flow pump,
7th, digital sampling and processing, 8, computer, 9, voltage-stabilized power supply.
Embodiment
Technical scheme is described in detail below in conjunction with accompanying drawing, so that those skilled in the art can be more
Add and be clearly understood from the present invention, but therefore do not limit the scope of the invention.
Using technical solution of the present invention, using infrared thermal imaging temperature sensing meanses, it is combined with probe measurement thermophysical parameter,
Implement the measurement and reconstruct of porous media accumulation fixed bed microresponse device three dimensional temperature distribution.Microresponse device 3 is cylinder
Type, using the form of coaxial sleeve, shell material is glass for infrared rays pipe（5 ~ 13 μ m wavelength range infrared light transmittances are
0.93）, effective length 100mm, internal diameter is respectively 10mm and 25mm, wall thickness 1mm, and arrangement interval 5mm rings between inner and outer pipes
Shape air layer plays heat insulation, while the influence to being radiated in infrared thermography can be ignored, inner and outer pipes both ends by
Silicone gasket is sealed and fixed with screwed SLA plugs, and micropore filter cloth is fixed with plug and is revealed to prevent stopping leak.Microresponse
Device 3 is fixed on adjustable support, and surrounding arranges heat-insulating shield, reduces influence of the environment temperature radiation to it.System principle such as Fig. 1
It is shown, fill porous media in the building up inside of microresponse device 3（Adsorb 732 type cationic ion-exchange resins of catalase
Grain, 0.8 ~ 0.9mm）For fixed bed form, system stream is connected, regulation thermostat 4 controls the temperature of the porch of microresponse device 3
Degree, sampling valve 5 is used for sample introduction, realizes the controllable chemical reaction in microresponse device 3, and constant flow pump 6 is with constant flow rate by solution
Inject microresponse device 3.Specific testing procedure is as follows：Probe 1 is placed in the central axis of microresponse device 3 first to survey to online
Effective thermal conductivity is measured, constant voltage is provided by voltage-stabilized power supply 9 needed for the heater strip of probe 1, equal in the surrounding of microresponse device 3
Three groups of infrared thermal imagery instrument probes 2 of even arrangement accumulate the hull-skin temperature of porous media with comprehensive measurement；Then it is online using probe 1
The thermophysical parameter such as effective thermal conductivity of accumulation porous media in microresponse device 3 is measured, and obtains axial centerline
Temperature, while the angle and focal length of infrared thermal imagery instrument probe 2 are adjusted, the Temperature Distribution of the outer surface of measurement microresponse device 3 and change
Change, due to using glass for infrared rays, therefore infrared thermal imagery instrument probe 2 can sense when porous Jie of accumulation in microresponse device 3
The hull-skin temperature distribution of matter and change, above-mentioned signal are handled through the Import computer 9 of data acquisition module 8, obtained such as Fig. 2 and figure
The representative temperature thermography and surface temperature distribution of accumulation porous media in microresponse device shown in 3；Finally, based on above-mentioned steps
The thermophysical parameters such as obtained central temperature, effective thermal conductivity and hull-skin temperature distribution, it is small anti-according to heat transfer theory
It is cylindrical type fixed bed to answer device, and assumes that porous media material is uniform and isotropism, flow velocity are stable state laminar flow compared with small flow, and
And be incompressible fluid, fluid and porous media solid skeleton are in local thermal equilibrium, obtain following heat conduction differential side
Journey group and uniqueness condition, mathematical analysis obtain the three-dimensional temperature field of accumulation porous media in microresponse device, such as Fig. 4 after solving
It is shown.
Wherein：
T is the temperature of fluid；
T is porous media（Resin）Temperature；
Cg is the specific heat of fluid；
Cs is porous media（Resin）Specific heat；
Kc is effective thermal conductivity；
ρgFor the density of fluid；
ρsFor porous media（Resin）Specific heat；
The mass velocity of G fluids；
H is fluid and porous media（Resin）The coefficient of heat transfer；
ε is porous media（Resin）Voidage；
γ chemical reaction rates；
Δ H chemical reaction enthalpy changes；
t0Initial temperature；
tiCentral axis temperature；
X is axial coordinate；
R is radial coordinate.
Claims (6)
1. a kind of porous media three dimensional temperature distribution measurement method, it is characterised in that comprise the following steps：It is porous in accumulation first
The thermal center (-tre) arrangement transient heat conduct coefficient measuring device of medium（1）, in the surrounding arrangement non-contact temperature measuring dress of accumulation porous media
Put（2）；Then the transient heat conduct coefficient measuring device is utilized（1）On-line measurement accumulation porous media effective thermal conductivity and
The thermal center (-tre) temperature of porous media is accumulated, while utilizes the non-contact temperature measuring device（2）The appearance of measurement accumulation porous media
Face Temperature Distribution；Finally, the effective thermal conductivity, the thermal center (-tre) temperature and the outer surface obtained based on above-mentioned steps
Temperature Distribution, solved to obtain the three dimensional temperature of accumulation porous media according to the Heat Conduction Differential Equations group and uniqueness condition of foundation
.
A kind of 2. porous media three dimensional temperature distribution measurement method according to claim 1, it is characterised in that the transient state
Heat conductivity measuring device（1）It is the device of sonde method and heat-pole method heat conducting coefficient measuring.
3. a kind of porous media three dimensional temperature distribution measurement method according to claim 1, it is characterised in that described non-to connect
Touch temperature measuring equipment（2）It is thermal infrared imager.
A kind of 4. porous media three dimensional temperature distribution measurement method according to claim 1, it is characterised in that the heat conduction
Differential equation group and uniqueness condition are according to heat transfer theory, are built according to the geometrical model of accumulation porous media and physical model
Vertical, and mathematical analysis method and Numerical Methods Solve can be passed through.
5. a kind of porous media three dimensional temperature distribution measurement method according to claim 1, accumulated applied to porous media
The three dimensional temperature distribution measuring of fixed bed microresponse device, it is characterised in that comprise the following steps：It is small anti-in cylindrical type first
Answer device（3）Central axis places probe（1）To on-line measurement effective thermal conductivity, in the microresponse device（3）Surrounding
It is evenly arranged three groups of infrared thermal imagery instrument probes（2）To measure hull-skin temperature comprehensively；Then the probe is utilized（1）On-line measurement
The microresponse device（3）The effective thermal conductivity of interior porous media, and the temperature of axial centerline is obtained, while adjust institute
State infrared thermal imagery instrument probe（2）Angle and focal length, measure the microresponse device（3）The outer surface temperature of interior accumulation porous media
Degree distribution；Finally, temperature, the effective thermal conductivity and the outer surface of the central axis obtained based on above-mentioned steps
Temperature Distribution, according to heat transfer theory, Heat Conduction Differential Equations group and uniqueness condition are obtained, mathematical analysis obtains described after solving
Microresponse device（3）The three-dimensional temperature field of interior accumulation porous media.
6. the three dimensional temperature distribution measuring of porous media accumulation fixed bed microresponse device according to claim 5, it is special
Sign is that the Heat Conduction Differential Equations group and uniqueness condition are：
Wherein：
T is the temperature of fluid；
T is porous media（Resin）Temperature；
Cg is the specific heat of fluid；
Cs is porous media（Resin）Specific heat；
Kc is effective thermal conductivity；
ρgFor the density of fluid；
ρsFor porous media（Resin）Specific heat；
The mass velocity of G fluids；
H is fluid and porous media（Resin）The coefficient of heat transfer；
ε is porous media（Resin）Voidage；
γ chemical reaction rates；
Δ H chemical reaction enthalpy changes；
t0Initial temperature；
tiCentral axis temperature；
X is axial coordinate；
R is radial coordinate.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987503A (en) * | 2019-12-19 | 2020-04-10 | 吉林建筑大学 | Heat pipe cooling system based on porous heat conduction material |
| CN112763014A (en) * | 2021-02-05 | 2021-05-07 | 江苏华尔威科技集团有限公司 | Oil well measuring system based on internet of things technology |
| CN113125495A (en) * | 2021-03-17 | 2021-07-16 | 北京理工大学 | Method for measuring and correcting thermal conductivity of stacked energetic material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987503A (en) * | 2019-12-19 | 2020-04-10 | 吉林建筑大学 | Heat pipe cooling system based on porous heat conduction material |
| CN112763014A (en) * | 2021-02-05 | 2021-05-07 | 江苏华尔威科技集团有限公司 | Oil well measuring system based on internet of things technology |
| CN112763014B (en) * | 2021-02-05 | 2021-09-21 | 江苏华尔威科技集团有限公司 | Oil well measuring system based on internet of things technology |
| CN113125495A (en) * | 2021-03-17 | 2021-07-16 | 北京理工大学 | Method for measuring and correcting thermal conductivity of stacked energetic material |
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