摘要
采用流体体积函数模型(VOF)对常重力、部分重力和微重力环境下垂直管内空气–水搅混流和制冷剂R134a蒸汽–液体搅混流进行数值模拟,研究重力环境对气液搅混流界面波高度,相界面稳定性及界面波形成周期的影响。与实验结果的对比显示数值模型是可靠的。数值结果表明,随着重力环境的减小,气液搅混流的界面波高度有所增大,相界面稳定性明显增强,界面波形成周期随之延长。空气–水搅混流界面波与R134a蒸汽–液体搅混流相比有显著不同。尽管R134a蒸汽和R134a液体的入口速度较小,但与空气–水搅混流相比,其相界面稳定性明显下降,形成周期缩短。上述结果对微重力和部分重力下换热设备的研究与设计提供了重要依据。
Using volume of fluid （VOF） method, numerical simulation was done to investigate the influence of gravity on gas-liquid （air-water and refrigerant R134a vapor-liquid） chum flow interfacial wave amplitude, interface stability and period of interfacial wave. The model was verified by the experimental data. The simulation results show that the gas-liquid chum flow interracial wave amplitude increases with the decrease of gravity. In addition, the interface stability is enhanced considerably and the period of the interracial wave is also prolonged. Significantly different from air-water chum flow, the interface stability of R134a vapor-liquid chum flow is worse and the period of interfacial wave is shorter, although the flow rates of R134a vapor and R134a liquid are slower. The conclusion provides theory basis for the research and optimization design of heat exchanger under partial gravity and microgravity conditions.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第14期75-81,6,共7页
Proceedings of the CSEE
