Drop Drag And Spray Models

Abstract

This paper reviews and critiques the published work of Liu et al, “On modeling the effect of drop drag and breakup on Fuel Sprays”. A dynamic drop drag model (DDM) has been coupled to the (TAB) and (KH) spray models. The interaction the (DDM) with these models provides insight into the phenomenon of drop drag and the atomization process. Due to the interaction of the parent drop during interaction with the spray, it is shown that the KH model must be adjusted to account for drag. The (TAB) model, however, remains unaffected by drag given the formulation of its breakup mechanism. The (DDM) also shows that the standard drag model underestimates drop size. And lastly, a critique of the ineffectualness of drop drag on penetration is presented.

Introduction

Recent studies estimate that twenty-five percent of the world’s energy comes from fuel spray combustion [4]. Given the impact of sprays on the energy industry, spray optimization is crucial to supply the growing demand for energy.
Spray and atomization science developed from the ideas prominent scientist like Rayleigh, Kelvin and Helmholtz who were studying liquid jet break-up mechanisms. All modern models incorporate their work in some way. The field is a conglomerate of studies and insights built on break-up mechanisms, drop dynamics, and spray characteristics but a unified theory of atomization still escapes scientist and research engineers. An often neglected phenomenon is drag. Drag is often negligible or neglected in order to simplify theories. Is drag neglected in fuel sprays? What is the influence of drag on fuel spray models? These questions lead to a review of the, “Modeling the Effect of Drop Drag and breakup on Fuel Sprays,” published by Lui et al which answers these questions.

Method

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