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首页> 外文期刊>International Journal of Heat and Mass Transfer >Determining the thermal conductivity of liquids using the transient hot disk method. Part Ⅰ: Establishing transient thermal-fluid constraints
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Determining the thermal conductivity of liquids using the transient hot disk method. Part Ⅰ: Establishing transient thermal-fluid constraints

机译：使用瞬态热盘法确定液体的热导率。第一部分：建立瞬态热流体约束

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摘要

Methods to determine the thermal conductivity of liquids have come under increased scrutiny recently due to their relative importance in determining the precise physical mechanisms responsible for heat flow in different materials and at multiple length scales. In transient-based systems, one important but often overlooked parameter is the onset of natural convection. In the first part of this study, the transient effects of natural convection are analyzed numerically for a relatively new transient thermal characterization system (transient hot disk) in order to determine when they begin to affect the calculation of a surrounding fluid's thermal conductivity. A comprehensive analysis of the effect of a fluid's pertinent thermophysical properties, Rayleigh number and Prandtl number on the sensor temperature response during testing is completed. Subsequently, a correlation is developed to determine the onset of natural convection during testing for fluids having a wide range of Prandtl numbers. The solution is verified using experimentation with multiple fluids having known, temperature-dependent volumetric heat capacities. The correlation is used as part of a new method to accurately calculate the thermal conductivity of different Newtonian fluids in Part Ⅱ of this study, which is published separately.
机译：由于液体在确定引起不同材料和多种长度尺度下的热流的精确物理机制方面的相对重要性，最近确定液体导热性的方法受到了越来越多的审查。在基于瞬态的系统中，自然对流是一个重要但经常被忽略的参数。在本研究的第一部分中，对一个相对较新的瞬态热特征系统（瞬态热盘）进行了数值分析，分析了自然对流的瞬态效应，以确定它们何时开始影响周围流体导热系数的计算。在测试过程中，完成了对流体的相关热物理特性，瑞利数和普朗特数对传感器温度响应的影响的综合分析。随后，建立相关性以确定在测试具有宽范围的普朗特数的流体期间自然对流的开始。使用具有已知的，与温度相关的体积热容的多种流体进行实验，可以验证该溶液。相关性是本研究第二部分中精确计算不同牛顿流体热导率的一种新方法的一部分，该方法将另行发布。

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