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Voltage measurement method for transient measurement of thermophysical property of materials through hot-wire method

A technique of voltage measurement, the hot wire method, used in the fields of thermal and heat transfer

Inactive Publication Date: 2019-04-05
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] In order to confirm this conclusion with experimental methods, the applicant trial-produced an instrument that adopts the correct data processing method and still uses thermocouples to measure temperature, and verified the data processing method of GB / T 10297-2015 again. has serious flaws

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Embodiment Construction

[0091] Please read the reference [1] Chen Zhaodong et al. "Study on Thermal Properties of Transient Measurement by Hot Needle Method" China Test 2015.1 66-70, which will help to understand the present invention.

[0092] The core content of the invention is to provide a new measuring principle and data processing method of a voltage measuring method for transiently measuring the thermophysical properties of materials by the hot wire method.

[0093] Derivation of the voltage equation

[0094] Note that the hot wire is a piece of wire, which can be regarded as a cylindrical resistor. When a hot wire is given, its resistance is a single-valued function of temperature. When the hot wire is energized and heated, the temperature of the hot wire will continue to increase as time changes. If the heating wire is in a vacuum, the change law of the heating wire resistance with the heating temperature is

[0095] R(T)=R 0 (1+αΔT) (1)

[0096] In the formula, ΔT=T(r 0 ,t)-T(r 0 ,t ...

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Abstract

The invention discloses a voltage measurement method for transient measurement of the thermophysical property of materials through a hot-wire method. A general measurement principle and a calculationformula of the thermophysical property of the materials are given, meanwhile, the probe manufacturing difficulty during temperature measuring can be reduced, the accuracy of voltage measurement is much higher than that of temperature measurement, and thus it can also be expected that the measurement accuracy of the thermophysical property of the materials is improved through the voltage measurement method.

Description

technical field [0001] The invention belongs to the fields of heat and heat transfer, measurement, research, analysis and application of material thermophysical properties and the like. It can be widely used in engineering technology and new material development and research such as heat insulation, heat preservation, heat conduction, heat dissipation and heat storage. Background technique [0002] The thermal conductivity of materials is measured by the hot wire method, which is a basic method for measuring thermal conductivity of materials. In China, there are already national standards GB / T 10297-2015 and GB / T 11205-2009. The American Society for Testing and Materials also has standards such as ASTM CH13 and ASTMD5930. Europe and Japan also have corresponding standards. The oldest of these standards has been in existence for over forty years. However, there are indeed serious problems in the data processing of the thermal conductivity of materials measured by the hot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20G01N25/00
CPCG01N25/005G01N25/20
Inventor 陈昭栋
Owner SOUTHWEAT UNIV OF SCI & TECH
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