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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 Ⅱ: Establishing an accurate and repeatable experimental methodology
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Determining the thermal conductivity of liquids using the transient hot disk method. Part Ⅱ: Establishing an accurate and repeatable experimental methodology

机译：使用瞬态热盘法确定液体的热导率。第二部分：建立准确，可重复的实验方法

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In this study, the accuracy of the conventional method that is employed to determine the thermal conductivity of fluids with the transient plane source (TPS) technique is evaluated experimentally using six different fluids. It was found that the accuracy of this method is insufficient for calculating the thermal conductivity of fluids due to: (1) the technique's inability to resolve the volumetric heat capacity in close proximity to the sensor, leading to highly erroneous calculations of thermal conductivity at early time scales, and (2) the lack of any means to predict whether the onset of natural convection will have an effect during testing. As a result, a new method is developed that utilizes the known volumetric heat capacity of a fluid and the equation used to predict the onset of natural convection that was developed in Part I of this study, which is published separately. Results suggest that this new method yields highly accurate calculations for the thermal conductivity of fluids (within 5.6% of values reported in the literature) over a wide range of Prandtl number (Pr = 0.7-11,000) and temperature.
机译：在这项研究中，使用六种不同的流体通过实验评估了采用瞬态平面源（TPS）技术确定流体导热系数的传统方法的准确性。结果发现，该方法的准确性不足以计算流体的导热系数，原因如下：（1）该技术无法解析传感器附近的体积热容，从而导致早期错误地计算导热系数时间尺度；以及（2）缺乏任何方法来预测自然对流的发生是否会在测试期间产生影响。结果，开发了一种新方法，该方法利用了已知的流体体积热容量和方程式来预测自然对流的发生，该方程式是在本研究的第一部分中开发的，该方法将另行发布。结果表明，这种新方法可以在很宽的Prandtl数（Pr = 0.7-11,000）和温度范围内对流体的热导率（在文献中报道的值的5.6％内）进行高度精确的计算。

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