矩形截面螺旋细通道内气液两相流液相分布及压降特性  

Two-phase liquid distribution and pressure drop in helical mini-channels with rectangular section

作　　者：林清宇 吴佩霖[1] 冯振飞 艾鑫 LIN Qingyu;WU Peilin;FENG Zhenfei;AI Xin(School of Mechanical Engineering,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学机械工程学院,广西南宁530004 [2]广西大学广西石化资源加工及过程强化技术重点实验室,广西南宁530004

出　　处：《化工科技》2020年第1期41-46,51,共7页Science & Technology in Chemical Industry

基　　金：广西石化资源加工及过程强化技术重点实验室主任基金资助项目(2019Z012);广西高校中青年教师基础能力提升项目资助项目(2019KY0011)

摘　　要：为探究不同操作参数及结构下矩形截面螺旋细通道内气液两相流的液相分布及压降特性,建立了光滑螺旋通道及内置矩形涡发生器的螺旋通道2种模型,在进口速度u in=0.22~0.32 m/s,进口含气率α=0.55~0.59的条件下,以空气-水两相流为工质进行了数值模拟。结果表明,在研究的范围内通道内液体受离心力的影响被甩向螺旋通道外侧,而气体分布于通道内侧。进口含气率的增加会减少通道外壁面的液膜厚度。通道内置的矩形涡发生器可使内部工质产生二次流从而增强混合,有效提升截面含气率。除此之外,进口速度的增大、进口含气率的减小及矩形涡发生器的加入均会使矩形螺旋细通道内两相压降增大。In order to investigate the effects of experimental conditions and structures on two-phase pressure drop and liquid distribution in helical mini-channels with rectangular section,two models of smooth helical mini-channel and helical mini-channel with rectangular vortex generator are established.With air-water as working fluids,the two-phase pressure drop and liquid distribution of two models under the conditions of u in=0.22~0.32 m/s and α=0.55~0.59 are analyzed by numerical simulation.The results show that the liquid is on the outside of the channel and the gas is on the inside due to the effect of centrifugal force.The increase of inlet void fraction will reduce the thickness of liquid film on the outside of channel.The rectangular vortex generator in the helical channel enables the working fluid to generate secondary flows to enhance mixing,which can effectively improve the section void fraction.Moreover,the increase of inlet velocity,the decrease of inlet void fraction and the addition of rectangular vortex generator will increase the two-phase pressure drop in the helical mini-channels with rectangular section.

关 键 词：涡发生器 两相流 螺旋通道 压降 

分 类 号：TK124[动力工程及工程热物理—工程热物理]