Second Law Analysis of Spray Evaporation

[+] Author and Article Information
S. K. Som

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, West Bengal, India

A. K. Mitra, S. P. Sengupta

Department of Chemical Engineering, Indian Institute of Technology, Kharagpur, West Bengal, India

J. Energy Resour. Technol 112(2), 130-135 (Jun 01, 1990) (6 pages) doi:10.1115/1.2905719 History: Received April 20, 1989; Revised March 05, 1990; Online April 16, 2008


A second law analysis has been developed for an evaporative atomized spray in a uniform parallel stream of hot gas. Using a discrete droplet evaporation model, an equation for entropy balance of a drop has been formulated to determine numerically the entropy generation histories of the evaporative spray. For the exergy analysis of the process, the rate of heat transfer and that of associated irreversibilities for complete evaporation of the spray have been calculated. A second law efficiency (η II ), defined as the ratio of the total exergy transferred to the sum of the total exergy transferred and exergy destroyed, is finally evaluated for various values of pertinent input parameters, namely, the initial Reynolds number (Rei = 2ρg V i x i /μ g ) and the ratio of ambient to initial drop temperature (Θ ∞ ′/Θ i ′).

Copyright © 1990 by The American Society of Mechanical Engineers
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