摘要
本文以空气-水蒸气-水组成的两相流混合物为例,应用两相流及热物理理论,推导了有相变的两相流系统非平衡过程的比定压热容计算式,并对实际的空气-水蒸气-水两相流动的换热过程进行了数值模拟.计算结果揭示了比定压热容的变化明显受到水颗粒相变过程的影响,颗粒的半径越小,比定压热容变化越大。同时,平衡相变过程比定压热容计算的流体温度要高于非平衡相变过程,两者的差异随着颗粒蒸发过程的进行而逐渐增大,且靠近轴线的差异要比靠近壁面处的差异大,颗粒半径越小,两者的差异越小。
In this paper, the air-water-vapor system is taken as an example, and the formula of constant-pressure specific heat during non-equilibrium phase change process in the two-phase flow system is deduced using the theory of two-phase flow and thermophysics; corresponding calculation are employed to the actual two-phase flow process. The results show that the constant-pressure specific heat is obviously affected by the flow and phase change processes, the smaller the particle radius is, the higher the specific heat is. Meanwhile, the constant-pressure specific heat of equilibrium process is higher than that of non-equilibrium process and the difference gradually increases with the marching of evaporation process. Also the difference near the axis is higher than that near the wall, and the smaller the particle radius is, the smaller the difference is.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2008年第6期983-986,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.50676102
No.50536030)
关键词
比定压热容
两相流
非平衡相变
constant-pressure specific heat
two-phase flow
non-equilibrium phase change
