Measurement of the thermal conductivity of fluids using laser spot lock-in thermography

被引：7

作者：

Bedoya, A. ^{[1
,2
]}

Colom, M. ^{[2
]}

Mendioroz, A. ^{[2
]}

Salazar, A. ^{[2
]}

Marin, E. ^{[1
]}

机构：

[1] Inst Politecn Nacl, CICATA, Unidad Legaria, Legaria 694, Mexico City 11500, DF, Mexico

[2] Univ Basque Country, UPV EHU, Dept Fis Aplicada 1, Escuela Ingn Bilbao, Pza Ingeniero Torres Quevedo 1, Bilbao 48013, Spain

来源：

MEASUREMENT | 2020年 / 158卷 / 158期

基金：

芬兰科学院;

关键词：

Laser spot lock-in infrared thermography; Thermal conductivity; Fluids; Thermal resistance; Interfacial layer;

D O I：

10.1016/j.measurement.2020.107740

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, we propose a new method to retrieve the thermal conductivity of fluids, k(f), using laser spot lock-in infrared thermography. The measurement cell consists in two paralepidid blocks separated by a narrow gap of variable and known width, L. This gap can be filled with a gas or a liquid, producing a thermal contact resistance, R-th, which quantifies the thermal barrier to heat propagation. By focusing the laser spot close to the interface between the two solids, this thermal contact resistance can be obtained by fitting the temperature field recorded by the infrared camera to its analytical expression. Using the well-known relationship R-th = L/k(f), the thermal conductivity of the fluid is obtained from a simple linear relation. Measurements performed in test samples show a good agreement between determined thermal conductivities and literature reported values, demonstrating the validity of the method. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：6

共 15 条

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