Study On The Performance Of Heat And Mass Transfer Of Hollow Fiber Memberane Dehumification Under The Condition Of Flow-induced Vibration

With the continuous development of the economy and society,the industrial structure of the entire society is constantly changing.The most significant feature of the industrial society is that the production sites are turned indoors.Therefore,people’s requirements for the indoor environment are becoming more and more stringent.The indoor environment is also required to have a high degree of human comfort.The temperature and humidity of the air are the two main factors that affect the comfort of the indoor environment.In southern China,the wet days in March and April and the rainy season in July and August will cause the humidity to increase sharply.In such environment,the body comfort will be reduced,and at the same time,excessive humidity is very easy to breed various harmful microorganisms.Mold and mold spores will accelerate the reproduction and growth on the furniture walls and may spread into the air,posing a serious threat to human health.Mites are also easier to multiply under this condition,which increases potential allergens for allergic people.Therefore,dehumidification technology has received more and more attention in recent years.Hollow fiber membrane is a new type of membrane dehumidification material.It is made into membrane modules and used in dehumidification systems,because its material has high selective permeability and only water in humid air.Steam can pass through,but the desiccant flows in the fiber cannot penetrate,thus avoiding the pollution of the indoor environment caused by gas and liquid entrainment.When the hollow fiber membrane is working,the hollow fiber membrane is prone to bending and deformation under the combined action of the liquid gravity and the air flow,the vibration of the tube and the change of shape of tube has a very large impact on fluid flow and heat and mass transfer,but there are still insufficient researches on the heat and mass transfer of hollow fiber membrane tubes under vibration and bending.Therefore,this paper establishes a fluid-structure coupling model of tubes under different Reynolds numbers,and the main work is as follows:1.Use arbitrary Lagrangian-Euler method(ALE)to establish a two-way fluid-Structure interaction model,establish a model of a flexible hollow fiber membrane tube after deformation,and build a vibration test bench to measure the hollow fiber membrane tube under the action of fluid The displacement confirms the correctness of the model.2.On the basis of the above fluid-structure interaction model,add energy equation and species transport equation to establish a fluid-induced heat-mass-fluid-structure interaction model of fluid-induced fiber membrane vibration,and study the amplitude of the pulsating fluid and the frequency of the pulsating fluid The influence of the heat and mass transfer performance of hollow fiber membranes is studied by analyzing the flow field,temperature boundary layer and concentration boundary layer near the wall to study the internal mechanism of vibration-enhanced heat and mass transfer of hollow fiber membranes.3.Use two-way fluid-structure coupling to establish a bending model of the hollow fiber membrane under the tube side force to obtain the displacement of each point of the fiber membrane grid in the steady state,and obtain a three-dimensional model of the hollow fiber membrane that is bent under the action of fluid through reverse engineering.Establish a hollow fiber membrane bundle model containing multiple curved tubes and study the velocity field,temperature field,and concentration field of the heat and mass transfer of the hollow fiber membrane tube bundle under different inlet velocity,which are characterized by friction coefficient,Nusselt number and Sherwood number and summarized the law of the influence of the curved tube on heat and mass transfer.