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Device and method for rapidly testing effective thermal conductivity of porous metal material on basis of guarded hot plate method

A porous metal, rapid measurement technology, applied in the direction of material thermal development, etc., can solve the problem of increasing experimental measurement investment

Active Publication Date: 2016-06-29
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

On the other hand, the determination of heat flow requires the use of heat flow sensors, which increases the investment in experimental measurements

Method used

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  • Device and method for rapidly testing effective thermal conductivity of porous metal material on basis of guarded hot plate method
  • Device and method for rapidly testing effective thermal conductivity of porous metal material on basis of guarded hot plate method
  • Device and method for rapidly testing effective thermal conductivity of porous metal material on basis of guarded hot plate method

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Embodiment Construction

[0047] The present invention will be described in further detail below.

[0048] 1. Test principle:

[0049] According to Fourier's law, in the case of one-dimensional steady-state heat transfer, the effective thermal conductivity k of the object e It can be expressed by the following formula:

[0050] k e = q Δ T / H = Q · H Δ T · A

[0051] Among them: where q is the heat flux density, ΔT is the temperature difference between the cold end and the hot end when the object is measured, H is the thickness of the measured sample, A is the nominal cross-sectional area of ​​the measured sample, and Q is the heat transfer per unit time.

[0052] In view of the working mode of the tempe...

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Abstract

The invention relates to a device for rapidly testing effective thermal conductivity of a porous metal material on the basis of a guarded hot plate method. The device comprises a guarded hot plate testing unit located at a hot end of a to-be-tested sample, a temperature control and timing unit connected with the guarded hot plate testing unit, a water cooling unit located at a cold end of the to-be-tested sample as well as a temperature acquisition unit for acquiring the temperature of the cold end and the hot end of the to-be-tested sample; the guarded hot plate testing unit comprises a main heater, a thermal insulating layer, a side auxiliary heater and a bottom auxiliary heater; the water cooling unit comprises a water cooling head covering the upper end surface of the to-be-tested sample, and the main heater covers the lower end surface of the to-be-tested sample. The invention further relates to a method for rapidly testing the effective thermal conductivity of the porous metal material on the basis of the guarded hot plate method. Through temperature control and time accumulation, the thermal flux density in the guarded hot plate method is measured, and the device and the method have the characteristics that the device cost is lower, the circuit is simple to connect and convenient to build, the testing speed is rapider and the like. The invention belongs to the technical field of testing of heat transfer performance.

Description

technical field [0001] The invention relates to the technical field of heat transfer performance testing, in particular to a measuring device and method for the effective thermal conductivity of porous metal materials. Background technique [0002] Porous metal materials have the characteristics of light weight, good mass transfer capacity, high mechanical strength, and large specific surface area, so porous metal materials are widely used in the field of catalyst supports. When a porous material is used as a carrier, its thermal conductivity has a great influence on the catalytic performance and life of the catalyst. The carrier with good thermal conductivity helps to remove the heat of reaction and avoid local overheating of the catalyst surface. Effective thermal conductivity is a coefficient that reflects the thermal conductivity of a substance. However, due to the limitations of porous materials, porous skeletons, porosity, and theoretical applicability, the thermal co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 万珍平邓俊
Owner SOUTH CHINA UNIV OF TECH
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