论文部分内容阅读
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。
The fluid volume function model (VOF) was used to simulate the vertical tube air-water mixing flow and the refrigerant R134a steam-liquid mixing flow under constant gravity, partial gravity and microgravity, and the effect of gravity environment on the mixing height , Phase interface stability and interface wave cycle. The comparison with the experimental results shows that the numerical model is reliable. Numerical results show that with the decrease of gravity environment, the interfacial wave height of gas-liquid mixing flow increases, the stability of phase interface increases obviously, and the period of interface waveforms increases. The air-water mixing flow interface wave is significantly different from the R134a steam-liquid mixing flow. Although the inlet velocities of R134a vapor and R134a liquid are small, the interfacial stability of the R134a vapor and the R134a liquid obviously decreases compared with that of the air-water mixed flow, and the formation cycle is shortened. The above results provide an important basis for the research and design of heat transfer equipment under microgravity and partial gravity.