摘要
为提高微重力条件下热线法对熔体导热系数的测量精度,探究电压引线位置、热丝温升变化和样品物性变化等因素对结果的影响,通过建立数学模型研究热丝在腔体内的传热过程,研究陶瓷管内导线发热对热丝端部的影响,分析热丝电阻变化和熔体导热系数增加对测量结果的影响。结果表明:导热系数越大,陶瓷管内导线对端部的传热影响越小;通过比较各监测点温度的一致性,确定电压引线可接在距离端部5~7 mm的位置;热丝温升在4 K以内时,热丝电阻变化引起的导热系数偏差在2%以内;针对所研究的样品,加热功率在8 W以下时,样品导热系数改变对结果的影响在2%以内。
In order to improve the measurement accuracy of the hot wire method for the thermal conductivity of the melt under microgravity conditions,explore the influence of factors such as the position of the voltage lead,the change of the temperature rise of the hot wire and the change of the physical properties of the sample on the results,study the heat transfer process of the hot wire in the cavity by establishing a mathematical model,study the influence of the heating of the wire in the ceramic tube on the end of the hot wire,and analyze the influence of the change of the resistance of the hot wire and the increase of the thermal conductivity of the melt on the measurement results.The results show that the larger the thermal conductivity,the smaller the influence of the conductor on the heat transfer at the end of the ceramic tube.By comparing the temperature consistency of each monitoring point,it is determined that the voltage lead can be connected 5-7 mm from the end.When the temperature rise of hot wire is within 4 K,the thermal conductivity deviation caused by the change of hot wire resistance is within 2%.For the samples studied,when the heating power is below 8 W,the influence of the change of the thermal conductivity of the samples on the results is within 2%.
作者
陈珂
李会东
陶冶
潘秀红
曹成成
杨莉萍
刘杰
CHEN Ke;LI Huidong;TAO Ye;PAN Xiuhong;CAO Chengcheng;YANG Liping;LIU Jie(School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266000,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China)
出处
《中国测试》
CAS
北大核心
2024年第11期40-46,共7页
China Measurement & Test
基金
中国载人航天科技项目(YYMT1201-EXP02)
中国科学院上海硅酸盐研究所青年基础基金项目(2022000305)
上海市无机材料检测技术平台(19DZ2290700)。
关键词
熔体
导热系数
瞬态热线法
数值模拟
melt
thermal conductivity
transient hot wire method
numerical simulation
