T形微通道内氮气/非牛顿流体两相流相分配

Phase Distribution of Nitrogen/Non-Newtonian Flow at Micro-T-Junction

以氮气作为气相工质,以纯水和浓度分别为0.10wt%、0.25wt%、0.50wt%的PAAm水溶液分别为液相工质,在当量直径为178μm的T形微通道内进行气液两相流相分配的实验。实验结果表明:非牛顿流体的性质对两相流相分配特性有着重要的影响。当液体的有效黏度增加时,弹状流和环状流的液相采出分率增加。通过对弹状流与环状流两种流型的对比,发现环状流的液相采出分率受非牛顿流体性质影响较大,而弹状流受其影响较小。

With air as the gas test fluid and both pure water and PAAm aqueous solution with 0.01wt% , 0.25wt% and 0.50wt% as the test fluid, an experimental investigation into phase distribution of gas-liquid flow through a T-junction with 178μm hydraulic diameter was conducted. The experimental results show that the property of non-Newtonian fluid in micro-T-junction can influence the phase distribution, and the decrease in liquid effective viscosity makes liquid＇ s taking off of both slug and annular flow reduced. Comparing the flow pattern of slug and annular flow shows that the property of non-Newtonian fluid can influence liquid＇ s tak- ing-off much of the annular flow and does little on that of slug flow.