Vertical Drop Of Vertical Thin Liquid Membrane Absorption Process Simulation

Theme of desiccant is a common concern in today’s world, it is important in building environment and industrial production and application of the dehumidifying technology has become a more extensive academic research direction. Theme of energy saving is a common concern in today’s world, due to the energy consumption of dehumidification20-40%of the air conditioning energy consumption, but the liquid desiccant is not only relative to the traditional air-conditioning dehumidification technologies is greatly save the energy consumption, also can make full use of solar energy, geothermal energy and natural energy, such as industrial waste heat or low grade energy accessible. Therefore, research in solar, geothermal. or industrial waste heat driven liquid dehumidifying technology has very important practical significance. Liquid desiccant is a complicated heat and mass transfer process, the changing structure of dehumidification by augmenting the fluid contact area, prevent dry spot and enhance the heat transfer and mass transfer coefficient is the key to improve dehumidification performance, therefore the physical process of liquid desiccant to develop green and efficient liquid dehumidifying technology has important theoretical significance.In this paper, on the basis of previous studies, according to the theory of micro scale heat transfer membrane dehumidification micro scale structure is put forward, using theoretical analysis and numerical simulation study of micro scale membrane dehumidification process, exploring the law of heat and mass transfer, analyze the geometric structure, the system physical parameters effect the performance of the desiccant, specific studies are as follows:(1)The process of heat and mass transfer of gas-liquid interface, according to the size of the actual model desiccant dehumidifier as well as the references and boundary conditions, plate dehumidifier model is set up. Dehumidification unit set size to40x200mm, the fluent software for simulation.(2) Simulating the basic condition of dehumidification unit, concluded that lithium bromide solution side mole fraction distribution, the molar concentration of water vapor in the air distribution and temperature distribution of the air and solution after dehumidification, analysising the change trend of each figure and the experiment results in literature.(3) Change air inlet humidity ratio, air inlet temperature, air inlet velocity, solution inlet temperature, inlet concentration and solution obtained air outlet’s moisture content varies with the air inlet humidity ratio, solution inlet temperature and inlet air speed increases, the amount of desiccant air varies with the entrance of the solution concentration and entry decreases with the increasing of the temperature of the air. The curve of the increase or decrease trend consistent with the references.(4) Change between gas and liquid separator porosity, dehumidifying plate plate length, the dehumidification model and to simulate the cooling water system, concludes that increasing separator porosity, gas liquid contact time, take away the dehumidification process of convective heat and latent heat of gasification increases the dehumidifier dehumidification effect...