湿空气在泡沫金属内析湿过程的换热与压降特性影响因素分析

实验研究了湿空气在泡沫金属内流动析湿过程的换热和压降特性,分析了不同因素的影响规律。研究结果表明:随着入口空气相对湿度的增大,凝结水增多,使泡沫金属的换热量和压降均增大;当入口相对湿度从50%增大到90%时,换热量和压降最大增加了67%和62%;随着入口空气温度的升高,泡沫金属换热量和压降增大;随着冷却水温度的升高,泡沫金属的换热量和压降均下降;随着孔密度的增大,压降增大,但由于受到凝结水影响,总换热量会先减小后略有增大;泡沫金属的迎风高度越大,总换热量和压降越大。

Analysis of influence factors for heat transfer and pressure drop characteristics of moist air in metal foams during dehumidifying process

The heat transfer and pressure drop characteristics of moist air in metal foam during the flow and dehumidification process were investigated experimentally, and the influence of different factors was analyzed. Heat transfer rate and pressure drop increased with increasing relative humidity as a result of increasing condensate water. When relative humidity increased from 50% to 90%, heat transfer and pressure drop respectively increased by 67% and 62%. With the increase of inlet air temperature, heat transfer rate and pressure drop increased. Heat transfer rate and pressure drop decreased with increasing cooling water temperature, pressure drop increased with increasing pore density, while heat transfer at first decreased slightly and then increased because of the influence of condensate water. Heat transfer rate and pressure drop increased with the increase of windward height of copper foam.