Jumping droplets  

作　　者：Jonathan B.Boreyko 

机构地区：[1]Department of Mechanical Engineering,Virginia Tech,Blacksburg,Virginia,USA

出　　处：《Droplet》2024年第2期3-33,共31页液滴（英文）

摘　　要：When microdroplets with quasi-spherical contact angles coalesce together on a low-adhesion substrate,the capillary-inertial expansion of the liquid bridge induces a dramatic out-of-plane jumping event due to symmetry breaking.From the onset of merging,droplet jumping initiates after a capillary-inertial time scale of t_(ci)∼1–100μs with characteristic jumping speeds of order v_(j)∼0.1m/s.This coalescenceinduced jumping-droplet effect is most commonly observed among a population of growing dew droplets on a superhydrophobic condenser,but can also occur by colliding deposited droplets together or during droplet sliding on fog harvesters.In this review,we cover the historical development of capillary-inertial jumping droplets,summarize the decade-long effort to rationalize the ultra-low energy conversion efficiency and critical droplet size of the phenomenon,and then present 15 variations on a theme of jumping.Capillary-inertial jumping droplets are not only a visceral illustration of the surprising power of surface tension at the microscale but they also have the potential to enhance phase-change heat transfer,enable selfcleaning surfaces,combat frost formation,harvest energy,and govern the rate of disease spread for wheat crops.

关 键 词：CAPILLARY ILLUSTRATION RATIONAL 

分 类 号：O35[理学—流体力学]