摘要
在介绍了热带法测量导热系数原理的基础上,通过fluent软件建立了数理模型,对热带法测量导热系数过程中材料厚度对测试结果的影响进行分析计算。在保证合理温升与可接受误差范围前提下,得到不同导热系数材料对应的最小可测厚度,并结合自行搭建的导热系数测试设备选取不同材料进行实验验证。结果表明:根据预估材料导热系数的大小从而确定其最小可测量厚度的方法有效,既解决了以往测试中所有材料要求同一测量厚度而带来的制样困难,将材料可测厚度从原来25 mm减小到了5 mm,甚至更薄,扩大了可测材料范围,又减小了以往叠加测量带来的接触热阻误差,提高了测试精度。对提升热带法测试技术水平及灵活应用有一定的借鉴意义。
Based on the principle of hot-strip method for measuring thermal conductivity,a mathematical model was established by Fluent for simulating the effect of material thickness on measuring thermal conductivity. Within the reasonable temperature rise and acceptable error range,the minimum measurable thickness for different material were obtained. And the simulated result was experimentally validated by test system designed by authors. The result showed that through rough estimation of thermal conductivity for different material,the minimum measurable thickness can be determined. This method can effectively solve the problem that the sample preparation is difficult because all materials required the same thickness previously. The measurable thickness of the material is decreased from 25 mm to 5 mm or even thinner. It expands the measurable range of materials,reduces the contact thermal resistance error because of sample stacking in previous test,ensures the accuracy of the measurement,improves the level of hot-strip method testing technology and makes its application more flexible.
出处
《实验室研究与探索》
CAS
北大核心
2015年第8期28-31,共4页
Research and Exploration In Laboratory
基金
上海市无机非金属材料分析测试表征专业技术服务平台项目(14DZ2292900)
关键词
导热系数
热带法
最小测量厚度
fluent数值模拟
thermal conductivity hot-strip method minimum measurable thickness fluent numerical simulation
