液滴碰撞超疏水表面上附着不相溶液滴机理研究  

Mechanism of a drop impact on an another immiscible one sitting on the superhydrophobic surface

作　　者：廖斌[1] 张龙飞 卜洋 李旋旋 林欣 汪超[1] 陈善群[1] LIAO Bin;ZHANG Longfei;BU Yang;LI Xuanxuan;LIN Xin;WANG Chao;CHEN Shanqun(Key Laboratory for Mechanics,Anhui Polytechnic University,Wuhu 241000,China)

机构地区：[1]安徽工程大学力学重点实验室,安徽芜湖241000

出　　处：《振动与冲击》2024年第14期80-90,共11页Journal of Vibration and Shock

基　　金：国家自然科学基金(42102082);安徽省自然科学基金(2308085MA28);安徽省高校优秀拔尖人才培育项目(gxgnfx2022013);安徽工程大学国家自然科学基金预研项目(Xjky2020167);安徽工程大学科研启动基金(2020YQQ072);安徽工程大学校级科研项目(Xjky2022171)。

摘　　要：以数值模拟为主要手段对液滴碰撞超疏水表面上附着不相溶液滴演变过程及内在机理进行了系统性的研究工作。首先,发掘出附着模式、弹开Ⅰ模式以及弹开Ⅱ模式等三种液滴碰撞的典型演变模式;其次,从能量角度揭示了Weber数(We)、Bond数(Bo)以及Ohnesorg数(Oh)等无量纲参数对于液滴碰撞动力学行为的影响规律;最后,建立了液滴碰撞典型演变模式与We、Bo、Oh等无量纲参数的依赖关系图谱。结果表明:碰撞液滴之间的能量传递、转换以及黏性耗散直接影响液滴碰撞的动力学行为;随着Oh的减小、Bo的减小以及We的增大,液滴碰撞典型演变模式出现从附着模式到弹开模式的转捩;We-Oh对液滴碰撞典型演变模式的影响规律与We-Bo近乎一致。The evolution of a drop impact on an another immiscible one sitting on the superhydrophobic surface as well as its intrinsic mechanism were systematically studied.Three typical evolution patterns of drop collision,namely,the attachment mode,bounce-offⅠmode,and bounce-offⅡmode,were verified by the numerical simulations.Based on the energy budget,the influences of Weber number(We),Bond number(Bo),and Ohnesorg number(Oh)on the dynamical behaviors of drop collision were revealed.In addition,the regime maps of typical evolution patterns of drop collision with the above dimensionless parameters were established.It is found that the energy transfer,conversion,and viscous dissipation between the colliding drops directly affect the dynamical behaviors of drop collision.With the decrease of Oh,the decrease of Bo,and the increase of We,the typical evolution pattern of drop collision shows a transition from the attachment mode to the bounce-off mode.The influence of We-Oh on the typical evolution pattern of drop collision is approximately the same as We-Bo.

关 键 词：界面 液滴碰撞 无量纲参数 能量 超疏水表面 

分 类 号：O359[理学—流体力学]