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TECHNICAL PAPERS

A Numerical Study of Droplet Evaporation and Combustion in the Presence of an Oscillating Flow

[+] Author and Article Information
M. Y. Ha

School of Mechanical Engineering, Pusan National University, 30 Changjeon-Dong, Kumjeong-Ku, Pusan 609-735, Korea

J. Energy Resour. Technol 119(2), 109-119 (Jun 01, 1997) (11 pages) doi:10.1115/1.2794974 History: Received August 03, 1995; Revised February 01, 1997; Online November 06, 2007

Abstract

The two-dimensional, unsteady, laminar conservation equations for mass, momentum, energy, and species transport in the gas phase are solved numerically in spherical coordinates in order to study heat and mass transfer, and combustion around a single spherical droplet. The droplet mass, momentum, and energy equations are also solved simultaneously with the gas phase equations in order to investigate the effects of droplet entrainment and heating in the oscillating flow with and without a steady velocity. The numerical solution for the case of single droplet combustion gives the droplet diameter and temperature variation as well as the gas phase velocity, temperature, and species concentrations as a function of time. The effects of frequency, amplitude of oscillating flow, and velocity ratio of oscillating flow amplitude to the steady velocity on droplet combustion are also investigated. The droplet burning history is not governed by the d 2 -law in the presence of oscillating flow, unlike the case of quiescent ambient conditions.

Copyright © 1997 by The American Society of Mechanical Engineers
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