超声波强化多孔膜蒸发器传热传质研究  

Research on heat and mass transfer in porous membrane evaporator enhanced by ultrasound

作　　者：周晟杰 陈威[1] Zhou Shengjie;Chen Wei(School of Merchant Marine,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]商船学院,上海海事大学,上海201306

出　　处：《低温与超导》2024年第6期81-89,共9页Cryogenics and Superconductivity

基　　金：上海市自然科学基金(23ZR1426300)资助。

摘　　要：本文研究了超声波作用下多孔膜蒸发器传热传质特性变化。运用数值模拟,通过修改流体在超声波近场区域的动量方程向蒸发器内输入超声波,采用局部热非平衡模型描述多孔膜内工质热传递,分析了超声波功率、频率以及入口流量对蒸发器换热能力以及性能评价因子(PEC)的影响。结果表明,超声波功率和频率的增大使得射流速度更快,声涡更大,加强了制冷剂在微通道内的对流换热性能以及在多孔膜内的蒸发量,同时减小压差从而增大PEC。当超声波功率为120 W,频率为60 kHz下,蒸发器移除热量增加5%,PEC可达1.031。Impact on heat and mass transfer of porous membrane evaporator under ultrasound was studied in this paper.Through numerical simulation,the momentum equation of fluid in near-field region of ultrasound was modified to input ultrasonic effect into evaporator,and local thermal non-equilibrium model was adopted to describe the heat transfer of working liquid inside porous membrane.The impacts of ultrasonic power and frequency and mass flow rate at the evaporator inlet on heat transfer capacity and performance evaluation criteria(PEC) were discussed.The results show that with the growth of power and frequency,velocity of jet and size of acoustic vortex is increased.Consequently,the convective heat transfer and evaporation flux are enhanced as well as PEC grows because of lower pressure difference.Heat dissipated by evaporator under ultrasound of 120 W and 60 kHz is increased by 5% and PEC is obtained as 1.031.

关 键 词：强化传热 超声波 微通道 蒸发 多孔介质 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]