固体表面湿润性对水平管分层流动湿润角的影响

Effects of Surface Wettabillty on Wetted Angle of Stratified Flow in Horizontal Tube

采用浸渍提拉镀膜法,将高/低表面能物质涂敷在玻璃管内表面,制备具有超亲水、亲水、疏水和超疏水特性的玻璃管。通过可视化方法,研究固体表面湿润性对水平管内气液两相分层流动的影响。研究结果表明,固体表面湿润性对水平管内分层流动特性有十分重要的影响,在相同的气体表观流速和液体质量流量下,分层流动的湿润角随固体表面亲水性的增强而明显增大;当液体表观流速较小时,亲水涂层玻璃管内湿润角随气体表观流速的增加而减小,而疏水涂层玻璃管内湿润角随气体表观流速的增加先增大后减小。

High/low surface energy materials were coated on the surface of the glass tubes,respectively,using dipcoating method,to prepare the glass tubes with superhydrophilic,hydrophilic,hydrophobic and superhydrophobic properties.Visualization searcher was performed to study the influence of surface wettability on the flow.characteristics of gas-liquid two-phase flow in the horizontal glass tubes.The results showed that the surface wettability had a significant effect on the wetted angle of the stratified flow in horizontal tubes,the wetted angle of the hydrophilic coating glass tubes were much larger than that of the hydrophobic coating glass tubes.When the superficial flow velocity of the liquid was small,the wettability angle of the hydrophilic coating glass tube decreased with the increasing of the superficial flow velocity of the gas,but the wettability angle of the hydrophobic coating glass tube first increased and then decreased with the increasing of the superficial flow velocity of the gas.