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首页> 外文期刊>Journal of thermal analysis and calorimetry >Measuring the thermal conductivity of heat transfer fluids via the modified transient plane source (MTPS)
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Measuring the thermal conductivity of heat transfer fluids via the modified transient plane source (MTPS)

机译：通过改进的瞬态平面源（MTPS）测量传热流体的导热系数

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摘要

Heat transfer fluids are often a critical performance component in industrial processes and system design. Fluids are used in heat dissipation to maintain stable operating temperatures in a variety of applications, such as diesel engines, chemical production, asphalt storage, and high-power electric transformers. A wide range of fluids specific to various applications are available, thus a reliable and accurate thermal conductivity characterization is extremely important. Thermal conductivity analysis of heat transfer fluids with traditional methods is time-consuming and error-prone due to the impact of convection. Convection often distorts effective thermal conductivity measurement as an additional source of heat transfer. The modified transient plane source method implemented in the C-Therm Technologies TCi Analyzer provides an easy way to accurately measure the thermal conductivity and distinguish this form of heat transfer in negating the impact of convection by (a) employing the shortest test time in commercially available sensors (0.8 s), (b) offering a minimal sample volume requirement (1.25 mL), and (c) employing a low-energy power flux to the specimen under test (approximately 2,600 W m~(-2)). This work presents thermal conductivity results generated on three types of heat transfer fluids over a wide temperature range and discusses the significance of the data in relevance to the application.
机译：传热流体通常是工业过程和系统设计中的关键性能组件。流体可用于散热，以在各种应用中保持稳定的工作温度，例如柴油发动机，化工产品，沥青储存和大功率电力变压器。可以使用各种针对各种应用的流体，因此可靠，准确的导热系数表征非常重要。由于对流的影响，使用传统方法进行传热流体的导热系数分析既费时又容易出错。对流经常使有效的热导率测量失真，使之成为额外的热传递源。在C-Therm Technologies TCi分析器中实施的改进的瞬态平面源方法提供了一种简便的方法，可通过以下方法轻松地准确测量热导率并区分这种形式的热传递，从而消除对流的影响：（a）使用市售的最短测试时间传感器（0.8 s），（b）提供最小的样品量要求（1.25 mL）和（c）对被测样品采用低能量的功率通量（约2,600 W m〜（-2））。这项工作介绍了在较宽的温度范围内在三种类型的传热流体上产生的热导率结果，并讨论了与该应用相关的数据的重要性。

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