摘要
超流氦的焦耳-汤姆逊系数在一定条件具有负值,且数值较大。由此产生的负焦耳-汤姆逊效应将会使其输送系统出现显著的温升,这一现象对于输送系统能否成功完成输送任务至关重要。如何确定He的Joule-Thomson系数,是判断He负焦耳-汤姆逊效应程度的前提和基础。文章通过直接状态方程法和热动力学公式法对He的Joule-Thomson系数进行了分析和计算,并在计算结果的基础上,拟合得到了便于工程应用的经验方程。
Generally, the Joule-Thomson coefficients of liquid HeⅡ are always negative and much higher than those of ordinary gases and liquids. The negative Joule-Thomson effect, which caused by negative Joule-Thomson coefficients, will lead to the temperature rise of the HeⅡ transfer system. Calculating the Joule-Thomson coefficients of HeⅡ is the precondition to determine the negative Joule-Thomson effect. In this paper, the calculation and analysis of the Joule-Thomson coefficients of liquid HeⅡ through the equation of state and thermodynamic identity are carried out and an empirical equation is obtained by curve fitting based on the results.
出处
《低温与超导》
CAS
CSCD
北大核心
2004年第4期19-21,10,共4页
Cryogenics and Superconductivity
基金
上海市科委重大项目(面向空间领域的若干科学和关键技术
编号为:03DZ14014)
