Motion of a merged drop upon impacting a liquid pool

Abhishek Saha, Yanju Wei, Xiaoyu Tang, Chung K. Law

Research output: Contribution to conferencePaper

Abstract

Drop impact on liquid films is relevant to many natural and industrial processes. Examples include the impact of sprayed fuel droplets on the fuel films formed from previously deposited droplets on the walls and piston head of internal combustion engines, and the impact of rain drops on ocean and wetted soil surfaces. Since the impacted drop can contain liquids with different temperature and chemical species than the impacted film, it is the motion of the merged drop and the associated mixing that initiates many post-merging thermal and chemical processes. In this paper we report an experimental study on the morphological evolution of an impacting drop inside the liquid pool after coalescence, using high speed laser induced fluorescence technique. We shall show that the drop motion can be divided into three stages, where inertia, capillary and viscous effects alternatingly play dominant roles to characteristically modulate the drop penetration. Furthermore, we shall also evaluate the relevant time and length scales of these three stages, and propose a unified description of the drop motion in the impacted liquid. Finally, we will use the experimental data from a wide range of drop diameter and impact speed to validate the proposed scaling.

Original languageEnglish (US)
StatePublished - Jan 1 2018
Event2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018 - State College, United States
Duration: Mar 4 2018Mar 7 2018

Other

Other2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018
CountryUnited States
CityState College
Period3/4/183/7/18

All Science Journal Classification (ASJC) codes

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

Keywords

  • Drop impact
  • Merging

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  • Cite this

    Saha, A., Wei, Y., Tang, X., & Law, C. K. (2018). Motion of a merged drop upon impacting a liquid pool. Paper presented at 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018, State College, United States.