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RESEARCH PAPERS

A Three-Dimensional Air-Vapor-Droplet Local Interaction Model for Spray Units

[+] Author and Article Information
S. J. Palaszewski

Bell Laboratories, Whippany Road, Whippany, NJ 07981

L. M. Jiji, S. Weinbaum

The City College of the City University of New York, Department of Mechanical Engineering, Convent Avenue at 138th Street, New York, NY 10031

J. Heat Transfer 103(3), 514-521 (Aug 01, 1981) (8 pages) doi:10.1115/1.3244494 History: Received July 14, 1980; Online October 20, 2009

Abstract

An approximate fully three-dimensional numerical model for predicting the detailed flow and thermal characteristics of spray units is presented. The new model differs from all previous analyses of spray cooling systems in that it determines the local variation in the dry-bulb temperature, absolute humidity and the air streamlines throughout the flow field encompassing the spray umbrella and the effect of this local variation on drop cooling. The conservation equations to determine the local absolute humidity, velocity and dry-bulb temperature of the air-vapor phase are written in Lagrangian form where the droplets are treated as spatially varying sources of mass, momentum and energy. The analysis takes into consideration stable and unstable meteorological conditions, turbulent mixing in the atmospheric surface layer and nonuniform upwind and local air-velocity profiles. The numerical model is of intrinsic interest because it demonstrates the feasibility of computing a three-dimensional, two-phase flow field without the use of excessive computer time. Model predictions of droplet return temperature along the spray centerline were compared with data for the Spraco 1751 nozzle. Good agreement was observed.

Copyright © 1981 by ASME
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