A proposed technique for controlling jet impingement boiling heat transfer involves injection of gas into the liquid jet. This paper reports results from an experimental study of boiling heat transfer during quenching of a cylindrical copper specimen, initially at a uniform temperature exceeding the temperature corresponding to maximum heat flux, by a two-phase (water-air), circular, free-surface jet. The second phase is introduced as small bubbles into the jet upstream of the nozzle exit. Data are presented for single-phase convective heat transfer at the stagnation point, as well as in the form of boiling curves, maximum heat fluxes, and minimum film boiling temperatures at locations extending from the stagnation point to a radius of ten nozzle diameters. For void fractions ranging from 0.0 to 0.4 and liquid-only velocities between 2.0 and 4.0 m/s several significant effects are associated with introduction of the gas bubbles into the jet. As well as enhancing single-phase convective heat transfer by up to a factor of 2.1 in the stagnation region, addition of the bubbles increases the wall superheat in nucleate boiling and eliminates the temperature excursion associated with cessation of boiling. The maximum heat flux is unaffected by changes in the void fraction, while minimum film boiling temperatures increase and film boiling heat transfer decreases with increasing void fraction. A companion paper (Hall et al., 2001) details corresponding results from the single-phase jet.
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Jet Impingement Boiling From a Circular Free-Surface Jet During Quenching: Part 2—Two-Phase Jet
David E. Hall,
David E. Hall
Michelin Americas Research Corporation, 515 Michelin Road, Greenville, SC 29602
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Frank P. Incropera,
Frank P. Incropera
Notre Dame University, South Bend, IN 46556
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Raymond Viskanta
Raymond Viskanta
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
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David E. Hall
Michelin Americas Research Corporation, 515 Michelin Road, Greenville, SC 29602
Frank P. Incropera
Notre Dame University, South Bend, IN 46556
Raymond Viskanta
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division May 27, 1997; revision received March 22, 2001. Associate Editor: M. S. Sohal.
J. Heat Transfer. Oct 2001, 123(5): 911-917 (7 pages)
Published Online: March 22, 2001
Article history
Received:
May 27, 1997
Revised:
March 22, 2001
Citation
Hall, D. E., Incropera, F. P., and Viskanta, R. (March 22, 2001). "Jet Impingement Boiling From a Circular Free-Surface Jet During Quenching: Part 2—Two-Phase Jet ." ASME. J. Heat Transfer. October 2001; 123(5): 911–917. https://doi.org/10.1115/1.1389062
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