超亲水微纳复合表面低流率蒸发液膜铺展特性  

Spreading characteristics of evaporating liquid film under low flow rate on super-hydrophilic micro-nano composite surface

作　　者：张羽飞[1] 春江[1] 温荣福[1] 马学虎[1] ZHANG Yu-fei;CHUN Jiang;WEN Rong-fu;MA Xue-hu(Liaoning Key Laboratory of Clean Utilization of Chemical Resource,Institute of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]辽宁省化工资源清洁利用重点实验室,大连理工大学化学工程研究所,辽宁大连116024

出　　处：《高校化学工程学报》2022年第2期184-192,共9页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(51836002)。

摘　　要：薄液膜在微反应器、微接触器等微过程中都有着重要的应用,提升表面毛细性能是实现低流量下液膜铺展的有效方法。制备得到了一种具有内部互连通道的微纳复合表面,对于工质水表面抽吸系数高达16.11 mm×s^(-0.5)。对毛细抽吸过程进行了可视化观测,结果表明微纳复合表面内部互连的微米级间隙作为流体的输运通道,可以大幅降低流动阻力;并发现了表面微结构特征对毛细性能的影响规律。探究了不同蒸发状态和不同供液量对铺展比例的影响,发现微纳复合表面能够在较低流量下实现较高的铺展比例,在0.24 mL×min^(-1)的低供液速率下实现了7 cm^(2)表面的完全润湿。这对于设计高毛细抽吸性能表面和研究低流量下液膜流动铺展特性具有重要的意义。Thin liquid films are widely existed in various areas,such as micro-reactors and micro-contactors.Current research mainly focuses on enhancing interfacial capillary performance to promote liquid film spreading.A super-hydrophilic micro-nano composite surface with internal interconnected channels was prepared,which had a sufficiently high surface wicking coefficient(16.11 mm×s^(-0.5),water).The capillary wicking process was visually observed.The results reveal that the interconnected micro channels are beneficial to the reduction of fluid flow resistance.Liquid film spreading characteristics were studied during evaporation under low flow rate.7 cm^(2) surface was completely wetted under low liquid supply rate of 0.24 mL×min^(-1).The results are helpful for the design of novel materials with high capillary wicking performance at low flow rates.

关 键 词：薄液膜 微观流动 毛细性能 抽吸系数 

分 类 号：TQ013.2[化学工程]