润湿模式对翅片表面结霜液滴生长的影响  

Effect of wetting mode on the growth of frosting droplets on fin surface

作　　者：于杰 吴浪 薛圣曦 阳曼秋 於逸飞 汪峰 YU Jie;WU Lang;XUE Shengxi;YANG Manqiu;YU Yifei;WANG Feng(School of Hydraulic,Energy and Power Engineering,Yangzhou University,Yangzhou 225127,China)

机构地区：[1]扬州大学电气与能源动力工程学院,江苏扬州225127

出　　处：《扬州大学学报（自然科学版）》2021年第5期43-48,共6页Journal of Yangzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52006186);江苏省高等学校自然科学研究面上资助项目(19KJB470037);扬州市“绿扬金凤”优秀博士资助项目.

摘　　要：为揭示翅片表面微结构在不同润湿模式下对结霜初期凝结液滴生长的影响,建立了光滑、Wenzel及Cassie润湿模式下翅片表面结霜液滴生长的热阻分析模型及生长速率模型,获得了表面接触角、润湿模式、表面微结构几何尺寸等因素对结霜液滴生长速率的影响规律.结果表明:相比光滑和Wenzel翅片,Cassie翅片表面的传热热阻最大,其液滴导热热阻和翅片结构热阻占总热阻的95%以上;增大表面接触角、减小翅片表面微结构的直径或增大其高度,有利于增大传热热阻.由于热阻较大,Cassie翅片表面的结霜液滴生长最慢,而增大表面接触角、合理优化表面微结构几何尺寸能进一步延缓其液滴生长,进而抑制后续的霜层生长.In order to reveal the influence of fin surface microstructures on the growth of condensation droplets at the initial frosting stage under different wetting modes,the thermal resistance model and growth rate model of frosting droplet on fin surface under smooth,Wenzel and Cassie wetting modes are established.The effects of surface contact angle,different wetting modes,and surface microstructure geometric sizes on the growth rate of frosting droplets are obtained.The results show that,compared with smooth and Wenzel fins,the thermal resistance of Cassie fin surface is the largest,in which the droplet heat conduction thermal resistance and fin structure thermal resistance account for more than 95%of the total thermal resistance.The heat transfer resistance can be increased by increasing the surface contact angle,decreasing the diameter or increasing the height of the fin surface microstructure.Due to the large thermal resistance,the frosting droplet growth on the surface of Cassie fin is the slowest.Increasing the surface contact angle or optimizing the geometric size of surface microstructure can further delay the droplet growth.

关 键 词：翅片 结霜 湿润模式 液滴生长 表面微结构 

分 类 号：TK124[动力工程及工程热物理—工程热物理]