Transition Boiling Heat Transfer of Droplet Streams and Sprays

[+] Author and Article Information
John D. Bernardin

Space Sciences and Applications Group, Los Alamos National Laboratory, P.O. Box 1663, MS D466, Los Alamos, NM 87545

Issam Mudawar

Boiling and Two-Phase Flow Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Heat Transfer 129(11), 1605-1610 (Feb 12, 2007) (6 pages) doi:10.1115/1.2764090 History: Received June 22, 2006; Revised February 12, 2007

An experimental study was performed to characterize the transition boiling heat transfer rate from a surface to a stream of impinging water droplets and to extrapolate this information to predict the transition boiling heat transfer of a dilute spray. First, transition boiling heat transfer data were gathered for a continuous stream of monodispersed water droplets striking a polished nickel surface. From these data, empirical correlations were developed to describe the heat transfer rate and heat transfer efficiency for droplet velocities between 1.0ms1 and 7.1ms1, droplet diameters ranging from 0.250×103mto1.002×103m, and surface temperatures covering 110240°C. By properly accounting for the hydrodynamic differences between a spray and a single droplet stream, the empirical single droplet stream heat transfer correlations were effectively extrapolated into a model for predicting the transition boiling heat flux of dilute sprays (Q0.5×103m3s1m2).

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Temperature-time history of a surface during spray quenching with a subcooled liquid

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Figure 2

Droplet heat transfer apparatus

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Figure 3

Empirical data of heat flux from a heated surface to a single stream of droplets with a given diameter and velocity

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Figure 4

Correlation of the single droplet stream transition boiling heat transfer rate data

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Figure 5

Comparison of the spray transition boiling heat flux model to spray heat flux correlations

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Figure 6

Comparison of the spray transition boiling heat flux model, qsp,pred″, to the spray heat flux correlation of Klinzing (10), qtrans″, for various (a) volumetric spray fluxes, (b) droplet diameters, and (c) droplet velocities




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