Analysis and experiments of measuring thermal conductivity and diffusivity of materials by plane source-pulse transient method

doi:10.11949/0438-1157.20190550

Abstract

Abstract:

The influence of pulse heating duration on measurement and the f coefficient in the formula for calculating thermal parameters in the experiment of plane source-pulse transient method are theoretically analyzed. The corresponding experimental apparatus is established and some commonly used materials are measured in practice. The uncertainty of thermal conductivity, thermal diffusivity and volume heat capacity measurement are systematically analyzed.

Key words: measurement, heat conduction, heat transfer, thermal conductivity, thermal diffusivity, plane source-pulse transient

摘要：

对于脉冲式平面热源法实验中的脉冲加热持续时间对测量的影响以及热参数计算公式中的f系数做了理论分析，建立了相应的实验装置并对一些常见材料进行实际测量，系统分析了热导率和热扩散率以及体积热容测试的不确定度。

关键词: 测量, 热传导, 传热, 热导率, 热扩散率, 脉冲式平面热源法

CLC Number:

TK 311

Fan YU,Xinxin ZHANG. Analysis and experiments of measuring thermal conductivity and diffusivity of materials by plane source-pulse transient method[J]. CIESC Journal, 2019, 70(S2): 70-75.

于帆,张欣欣. 脉冲式平面热源法测量材料热导率和热扩散率的分析与实验[J]. 化工学报, 2019, 70(S2): 70-75.

Figures/Tables 7

Fig.1 Schematic diagram of plane source-pulse transient method

Fig.2 Variations of coefficients f in formula with p

Fig.3 Effect of pulse time on temperature rise curve

Fig.4 Schematic diagram of experimental apparatus for plane source-pulse transient method

Table 1 Measurement results by plane source-pulse transient method

材料试样	$λ$ /(W/(m·K))	a/(m²/s)	$ρ c$ /(J/(m³·K))
纤维复合材料XW1	0.04904	1.469×10^-7	3.338×10⁵
工程塑料ABS2	0.1704	1.271×10^-7	1.341×10⁶
有机玻璃YB3	0.1952	1.127×10^-7	1.732×10⁶
大理石板DS4	2.928	1.361×10^-6	2.151×10⁶

Table 1 Measurement results by plane source-pulse transient method

材料试样	$λ$ /(W/(m·K))	a/(m²/s)	$ρ c$ /(J/(m³·K))
纤维复合材料XW1	0.04904	1.469×10^-7	3.338×10⁵
工程塑料ABS2	0.1704	1.271×10^-7	1.341×10⁶
有机玻璃YB3	0.1952	1.127×10^-7	1.732×10⁶
大理石板DS4	2.928	1.361×10^-6	2.151×10⁶

Fig.5 Temperature response of perspex specimen by pulse heating

Table 2 Calculations of uncertainty components in thermal parameter measurement

不确定度计算项目	相对不确定度/%	类型
热通量	0.19	B
测温点距离	0.58	B
最大温升	1.4	B
最大温升时间	0.29	B
脉冲加热时间	0.58	B

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