On bouncing and absorption of drop impacting liquid film

Xiaoyu Tang, Abhishek Saha, Chung K. Law, Chao Sun

Research output: Contribution to conferencePaper

Abstract

Drop impact on liquid surfaces is ubiquitous in many natural and industrial processes, such as soil erosion through rain drop impact, ink-jet printing, and fuel spray impacting the cylinder walls in direct-injection internal combustion engines. In this study the impact outcome of either bouncing or absorption was first experimentally mapped in the H∗-W e space, where H∗ is the liquid thickness normalized by the drop radius, and W e the drop Weber number. It is observed that there exists a critical W ecr beyond which the drop always merges with the liquid film. However, for smaller values than W ecr, the impact exhibits a nonmonotonic transition with increasing film thickness, from absorption to bouncing to absorption and finally to bouncing again. Using side-view shadowgraphy to observe the penetration process below the liquid surface, and through analysis of surface deformation for both the drop and film, the controlling mechanisms of these nonmonotonic transitions are identified, leading to the derivation of the scaling laws for the transition boundaries. These results provide useful insight into the role of the bottom surface and the film thickness on the impact dynamics and outcome.

Original languageEnglish (US)
StatePublished - Jan 1 2016
Event2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016 - Princeton, United States
Duration: Mar 13 2016Mar 16 2016

Other

Other2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016
CountryUnited States
CityPrinceton
Period3/13/163/16/16

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Chemical Engineering(all)

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    Tang, X., Saha, A., Law, C. K., & Sun, C. (2016). On bouncing and absorption of drop impacting liquid film. Paper presented at 2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016, Princeton, United States.