Gas-Assisted Droplet Impact on a Solid Surface

Author:

Diaz Andres J.1,Ortega Alfonso2

Affiliation:

1. Escuela de Ingenieria Industrial, Facultad de Ingenieria, Universidad Diego Portales, Av. Ejercito 441, Santiago Centro, Chile e-mail:

2. Mechanical Engineering Department, College of Engineering, Villanova University, 800 E. Lancaster Avenue, Villanova, PA 19085 e-mail:

Abstract

An experimental, numerical, and theoretical investigation of the behavior of a gas-assisted liquid droplet impacting on a solid surface is presented with the aim of determining the effects of a carrier gas on the droplet deformation dynamics. Experimentally, droplets were generated within a circular air jet for gas Reynolds numbers Reg = 0–2547. High-speed photography was used to capture the droplet deformation process, whereas the numerical analysis was conducted using the volume of fluid (VOF) model. The numerical and theoretical predictions showed that the contribution of a carrier gas to the droplet spreading becomes significant only at high Weo and when the work done by pressure forces is greater than 10% of the kinetic energy. Theoretical predictions of the maximum spreading diameter agree reasonably well with the experimental and numerical observations.

Publisher

ASME International

Subject

Mechanical Engineering

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