冰箱毛细管出口气液两相流理论

利用计算流体力学商业软件,建立锥形管内部气液两相流模型,对制冷剂喷射现象进行仿真研究;考察湍流强度、压力和流速沿流动方向的变化情况及流场分布情况。结果表明:喷射流场在进入锥形管20 mm内呈现出较强的湍流现象,其后流场渐趋平稳,锥形管进口段流动呈现出极大的不稳定性;制冷剂在毛细管出口10 mm内压力稍上升,随后迅速下降;建立的计算模型能够较好地预测管内流动状况;由于管截面均匀变化,高速喷射流体冲刷管内低速流体没有引起涡流现象,表明锥形管具有稳定流场的作用。

Theoretical research on gas-liquid two-phase flow at outlet of refrigerator capillary

Based on the CFD business software,a gas-liquid two-phase flow model was set up and an emulation research of the sprayed phenomenon inside the cone tube was carried out.Turbulent intensity,pressure and velocity along with the flow direction were investigated.The results show that turbulence phenomenon of the spray flow field is stronger at 20 mm of the cone tube,and it is gradually stable and thereafter flow in field,where the flow at the inlet of the cone tube still demonstrates the great instability.The pressure of refrigerant rises slightly in the exit of the capillary 10 mm,getting faster to drop afterwards.The computation model can be used to predict the situation of the inside flow.Because of the even change of sectioning,the high speed fluid does not cause the vortex phenomenon.It is obvious that cone tube is useful to the stabilization of the flow.