Bubble entrapment during the recoil of an impacting droplet  

作　　者：Thanh-Vinh Nguyen Masaaki Ichiki 

机构地区：[1]Sensing System Research Center,National Institute of Advanced Industrial Science and Technology(AIST),Japan,1-2-1 Namiki,Tsukuba-shi,Ibaraki 305-8564,Japan

出　　处：《Microsystems & Nanoengineering》2020年第1期768-774,共7页微系统与纳米工程（英文）

基　　金：This work was supported by JSPS KAKENHI Grant Number 17H04903.

摘　　要：When a droplet impacts a(super-)hydrophobic surface,there is a range of Weber numbers within which bubble entrapment will occur during droplet recoil due to closure of the air cavity developed when the droplet spreads out during the impact.In this study,we studied bubble entrapment using a microelectromechanical system(MEMS)-based acoustic sensor fabricated on a substrate.We found that bubble entrapment is followed by an acoustic vibration that can be detected by the sensor.Moreover,the frequency of the vibration is inversely proportional to the radius of the droplet,which indicates that this vibration is the resonant oscillation of the bubble.Therefore,the MEMS-based acoustic sensor can be used not only to detect but also to measure the size of the entrapped bubble.Finally,we demonstrated that it is possible to prevent bubble formation by allowing the air to escape to the underside of the droplet contact area.This can be done by creating through-holes on the substrate or decorating the substrate with sufficiently large textures.

关 键 词：BUBBLE RADIUS RESONANT 

分 类 号：O35[理学—流体力学] TP212[理学—力学]