空气隙膜蒸馏系统热容腔膜面处流场的数值模拟  

The numerical simulation of the flow field near membrane surface of hot-cavity in the air gap membrane distillation

作　　者：韩丽宁 陈永艳[1] 田瑞[1] 杨晓宏[1] 

机构地区：[1]内蒙古工业大学能源与动力工程学院,呼和浩特010051

出　　处：《膜科学与技术》2014年第2期40-44,50,共5页Membrane Science and Technology

基　　金：内蒙古自治区自然科学基金项目(2011MS0711);国家自然科学基金资助项目(51266007)

摘　　要：空气隙式膜蒸馏旋转切向入流利用出水口流体的切向流动对膜面进行冲刷,且不同的结构参数δ、β可加大靠近膜面流体的湍流强度,从而降低靠近膜面的边界层厚度即降低靠近膜面的浓度极化和温度极化现象,进而增大膜通量.利用Fluent软件可以模拟靠近膜面流体的流场、温度场、压力场等流体的流动情况.通过对比几组结构中靠近膜面流场的情况,可以推断出不同的β,δ以改变靠近膜面的浓度极化和温差极化现象.从而得到热容腔的最优结构.In the air gap membrane distillation,the rotary tangential flow of outlet was used to scour the membrane surface,and the structure parameterδandβwere adjusted to increase the turbulence intensity near the membrane surface.As result,the boundary layer thickness near the membrane surface was reduced,the concentration polarization and temperature polarization phenomenon were reduced,and the flux was increased.Fluent software can be used to simulate fluid flow field,temperature field,pressure field and flow state near the membrane surface.The concentration polarization and temperature polarization phenomenon near the membrane surface under differentδ,βcan be deduced by comparing the contrast groups of the flow field.So the optimal structure of the hot-cavity may be obtained.

关 键 词：空气隙膜蒸馏 旋转入流 数值模拟 

分 类 号：TK123[动力工程及工程热物理—工程热物理] TK124[动力工程及工程热物理—热能工程]