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LES of spray in crossflow - Effect of droplet distortion

Sinha, Anubhav and Ravikrishna, RV (2017) LES of spray in crossflow - Effect of droplet distortion. In: INTERNATIONAL JOURNAL OF SPRAY AND COMBUSTION DYNAMICS, 9 (1). pp. 55-70.

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Official URL: http://dx.doi.org/10.1177/1756827716652511

Abstract

The present investigation is focused on modeling of spray in crossflow using Large Eddy Simulations (LES). The modeling efforts are supported by experiments which are used both to provide accurate boundary and initial conditions and to evaluate droplet shapes in the near nozzle region. The droplets are modeled as Lagrangian parcels in an Eulerian continuum. Droplets in such configuration have been found to be distorted and not in perfect spherical shape from experimental results of our previous study. Droplet distortion is computed by Taylor-Analogy Breakup (TAB) distortion model. Each droplet is modelled as damped spring-mass system, where surface tension acts as a spring on the mass of the droplet and viscous dissipation provides the damping effect. The effort is to examine the effect of drag law used and the effect of this distortion on the droplet sizes produced in the flow field. Spray wind-ward trajectory and droplet sizes obtained from simulations are compared with the experimental results available. Although computational spray trajectory shows a reasonable match with experimental values, droplet sizes using the standard TAB model are found to be larger than that from experimental observation. To account for this distortion and its role in early breakup of droplets, constants of the TAB model are modified and the droplet sizes are found to be in good agreement with the experimental data.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the SAGE PUBLICATIONS INC, 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 19 May 2017 10:45
Last Modified: 29 Sep 2018 06:37
URI: http://eprints.iisc.ac.in/id/eprint/56686

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