作者：江楠竹1, 潘江1, 王玉刚1, 王清平2
作者单位：1. 中国计量大学计量测试工程学院, 浙江 杭州 310018;
2. 中石油塔里木油田分公司质量检测中心, 新疆 库尔勒 841000
关键词：导热系数;瞬态平面热源法;仿真分析;空气间隙
摘要：
通过对Hot Disk热物性分析仪的探头建立完善的二维仿真模型,将三维实体简化,数值模拟测量TPS(瞬态平面热源)法导热系数,再使用模拟温升进行计算。将模拟计算值与Hot Disk不锈钢标样导热系数测量值进行对比,证明模拟计算结果符合TPS法原理准确度要求。并对铜及气凝胶的导热系数测量进行模拟分析,考察实际测量过程中可能存在的各种因素如空气间隙、空气对流及样品微小形变对测量结果的影响。结果表明:实际测量时应保证样品与探头紧密接触以减小空气间隙,维持测试环境稳定以降低空气对流,而样品的微小形变对测量影响可忽略不计。
Simulation and analysis of thermal conductivity measurement with TPS method
JIANG Nanzhu1, PAN Jiang1, WANG Yugang1, WANG Qingping2
1. College of Metrology and Measurement, China Jiliang University, Hangzhou 310018, China;
2. Measurement Center for Quality, Tarim Oilfield Company, Petro China, Korla 841000, China
Abstract: An optimized two-dimensional simulation model which simplifying three-dimension entity for the probe of Hot Disk thermal constants analyzer was built to simulate thermal conductivity measurement with TPS (transient plane source) method. The thermal conductivity was calculated by using simulated temperature rise curve. Compared with test results of Hot Disk stainless steel guide sample thermal conductivity measurement, it shows that simulation results are in conformity with the accuracy requirements of TPS method. Some other materials such as copper and aerogel were used to analysis the thermal conductivity measurement, so as to survey the effect of air layer, air convection and minute sample deformation on measurement results during measurement. The results showed that the effect of air layer should be decreased by closely contacting the probe with the sample. A stable environment is recommended to reduce the air convection, and the effect of minute deformation could be ignored.
Keywords: thermal conductivity;transient plane source;simulation analysis;air layer
2016, 42(6): 122-126 收稿日期: 2015-10-06;收到修改稿日期: 2015-12-25
基金项目: 国家自然科学基金项目(51176177);浙江省教育厅科研项目(20070682)
作者简介: 江楠竹(1991-),男,河南信阳市人,硕士研究生,专业方向为仪器仪表工程。
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