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Access Type

WSU Access

Date of Award

January 2024

Degree Type

Thesis

Degree Name

M.S.

Department

Mechanical Engineering

First Advisor

G. Gilou Agbaglah

Abstract

In this study, we conduct three-dimensional Direct Numerical Simulations (DNS) to explore the breakup of the bag film formed by a droplet in uniform air flows. A comprehensive mesh convergence study is carried out, emphasizing the consistency of the interface shape. We analyze the time evolution of bag dimensions and compare our results with existing experimental and numerical data. Morphological transformations of the deforming droplet are scrutinized, providing insights into the intricate breakup process. Furthermore, we examine the influence of the gas Reynolds number on the droplet breakup, using comparisons between simulation results, experimental data, and outcomes obtained using the Manifold Death (MD) algorithm, a numerical technique for artificially perforating thin liquid films. The impact of the gas dynamics on the liquid film breakup is explored. A crater formation and a localized pressure jump is systematically observed inside the liquid film at the location where perforations will subsequently occur.

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