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Transition Boiling Heat Transfer of Droplet Streams and Sprays

[+] Author Affiliations
John D. Bernardin

Los Alamos National Laboratory

Issam Mudawar

Purdue University

Paper No. IMECE2005-79351, pp. 201-210; 10 pages
doi:10.1115/IMECE2005-79351
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Part B
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4222-3 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

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 was gathered for a continuous stream of monodispersed water droplets striking a polished nickel surface. From this data, empirical correlations were developed to describe the heat transfer rate and heat transfer efficiency for droplet velocities between 1.0 and 7.1 m s−1 , droplet diameters ranging from 0.250 × 10−3 to 1.002 × 10−3 m, and surface temperatures covering 110 to 240°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 (Q′ ≈ 0.5 × 10−3 m3 s−1 m−2 ).

Copyright © 2005 by ASME

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