Rapid thermal conductivity measurement with a hot disk sensor - Part 1. Theoretical considerations
Rapid thermal conductivity measurement with a hot disk sensor - Part 1. Theoretical considerations
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DOI：
10.1016/j.tca.2005.06.026
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发表时间：
2005-10-01
影响因子：
3.5
通讯作者：
Yi, H
中科院分区：
文献类型：
--
作者：
Yi, H
热盘技术是一种快速测量导热系数和热扩散系数的瞬态平面源方法。热盘技术的主要优点包括：宽的导热系数范围，从0.005 W/（m K）到500 W/（m K）;广泛的材料类型，从液体，凝胶到固体;易于样品制备;非破坏性;更重要的是，高精度。本文论述了用热盘传感器测量导热系数的基本理论。从瞬时点源解出发，导出了热盘测量时传感器表面平均温度变化的数学表达式。这种温度变化可以通过测量传感器的电阻来精确确定，它高度依赖于周围材料的热传输特性。通过分析作为时间函数的温度变化，可以推导出周围材料的热导率和热扩散率。几个实际的考虑，从样品尺寸的要求，消除接触热阻，也将进行讨论。(c)2005 Elsevier B. V.保留所有权利。
The hot disk technique represents a transient plane source method for rapid thermal conductivity and thermal diffusivity measurement. The main advantages of the hot disk technique include: wide thermal conductivity range, from 0.005 W/(m K) to 500 W/(m K); wide range of materials types, from liquid, gel to solid; easy sample preparation; non-destructive; and more importantly, high accuracy. In this paper, the basic theory of thermal conductivity measurement with hot disk sensor will be discussed. Starting from the instantaneous point source solution, the mathematical expression of the average temperature change in the sensor surface during a hot disk measurement will be derived. This temperature change, which can be accurately determined by measuring the electrical resistance of the sensor, is highly dependent on the thermal transport properties of the surrounding material. By analyzing this temperature change as a function of time, it is possible to deduce the thermal conductivity and the thermal diffusivity of the surrounding material. Several practical considerations, from sample size requirement to the elimination of thermal contact resistance, will also be discussed. (c) 2005 Elsevier B.V. All rights reserved.