Evaluation and Countermeasures of Convective Heat Transfer on Thermal Conductivity Measurement Using the Peltier Effect and Application to Supercritical CO2
Evaluation and Countermeasures of Convective Heat Transfer on Thermal Conductivity Measurement Using the Peltier Effect and Application to Supercritical CO2
复制标题
对流换热对珀耳帖效应热导率测量的评价及对策及其在超临界CO2中的应用
DOI：
10.1143/jjap.38.6840
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发表时间：
1999
影响因子：
1.5
通讯作者：
K. Nishikawa
中科院分区：
文献类型：
--
作者：
Zai–hua Chen;K. Tozaki;K. Nishikawa
在上一篇论文中，本作者报道了使用热电模块对流体进行热导率测量的新方法。对于超临界状态的样品来说，它非常简单且有效。但是，针对热扰动的对策不足。在目前的工作中，已经对设备进行了一些改进，以消除热对流。通过改变样品层的温度差来评估对流传热对测量的影响。已经发现，可以通过推断温度差向0来确定关键和超临界流体的无对流电导率。提出了通过改进方法测量的超临界二氧化碳的热导率，包括临界点附近的状态。
In the previous paper, the present authors reported a newly developed method of thermal conductivity measurement for fluids using a thermoelectric module. It was very simple and effective for samples in supercritical states. However, the countermeasures against thermal perturbation were insufficient. In the present work, some improvements have been made on the apparatus to eliminate thermal convection. The convective heat transfer effect on the measurement has been evaluated by varying the temperature difference across the sample layer. It has been found that the convection-free conductivity for critical and supercritical fluids can be determined by extrapolation of the temperature difference to 0. The thermal conductivity of supercritical CO2 measured by the improved method is presented, including the states near the critical point.