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丝网表面液滴撞击行为及气液分离器设计优化 被引量:1

Behavior of a Droplet Impacting on Mesh Screen and Optimal Design of the Gas-Liquid Separator
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摘要 本文通过高速摄影研究锡青铜网表面水滴撞击行为,探讨碰撞速度、角度及丝网浸润性对气液分离的影响。水滴撞击普通锡青铜网后阻尼振荡,最终沉积。撞击速度、丝网倾角越大,沉积液滴与丝网接触角越小,浸润面积越大。沉积液膜撕裂产生二次液滴携带,将严重影响气液分离效果。丝网经超疏水纳米修饰后,液滴撞击发生弹跳,丝网倾斜放置,法向撞击速度相对减小,可缓解弹跳液滴分裂产生子液滴及二次液滴携带,提高丝网气液分离器效率。 In order to understand the effects of drop impact velocity and mesh screen wettability on the gas-liquid separation,the behavior of a droplet impacting on the tin bronze mesh screen was investigated by visualization experiment.After impacting the bare tin bronze mesh screen,the water drop maintains damped oscillation until it deposits in the end.The increase in impact velocity of the droplet or tilt angle of the mesh screen leads to decrease in contact angle between the deposited droplet and the mesh screen,yielding increase in wetting area.The depositing droplets coalesce into liquid film,which can be destroyed by gas blowing during gas-liquid separation.The destruction of liquid film causes re-entrainment problem,rapidly worsening the separator performance.However,droplet rebounds after impacting on the superhydrophobic mesh screen with nanostructure.What is more,normal impact velocity decreases relatively with mesh screen placed in the tilted position.As a result,the numbers of splitting daughter droplets and the phenomenon of re-entrainment is reduced.So it's an optimal method to improve the efficiency of gas-liquid separator by superhydrophobic mesh screen with inclined installation.
作者 谢剑 何孝天 程愉 刘琪 徐进良 XIE Jian,HE Xiao-Tian,CHENG Yu,LIU Qi,XU Jin-Liang (The Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Crade Energy Utilization, North China Electric Power University, Beijing 102206, China)
出处 《工程热物理学报》 EI CAS CSCD 北大核心 2016年第6期1230-1236,共7页 Journal of Engineering Thermophysics
基金 国家自然科学基金重点项目(No.51436004) 国家自然科学基金国际合作与交流项目(No.51210011)
关键词 丝网 液滴撞击 气液分离 超疏水 纳米表面 mesh screen droplet impact gas-liquid separation superhydrophobic surface with nanostructure
作者简介 谢剑(1990-),男,博士研究生,主要从事微纳功能材料与传热强化研究。 通信作者:徐进良,教授,xjl@ncepu.edu.cn
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