This paper describes experimental efforts aimed at examining the effect of vapor bubble sliding on forced convection boiling heat transfer. Flow boiling experiments using FC-87 were conducted for vertical upflow and downflow configurations. Both slightly subcooled single-phase and saturated annular flow boiling were considered. Significantly higher heat transfer rates were measured for vertical upflow than for downflow with the same wall superheat and slightly subcooled single-phase inlet conditions. This increase in heat transfer is directly attributable to sliding vapor bubbles, which remain attached to the wall during upflow and lift off the wall during downflow. Differences in the measured upflow and downflow heat transfer rates are not as significant for annular flow boiling, which is due in part to the similar vapor bubble dynamics which have been observed for upflow and downflow. Heat transfer experiments in single-phase subcooled upflow with air bubble injection at the heating surface suggest that sliding bubbles enhance the bulk liquid turbulence at the wall, which contributes significantly to the macroscale heat transfer. It is concluded from this work that vapor bubble sliding heat transport can be a significant heat transfer mechanism, and should be considered in the development of mechanistic flow boiling heat transfer models.
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The Influence of Vapor Bubble Sliding on Forced Convection Boiling Heat Transfer
G. E. Thorncroft,
G. E. Thorncroft
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611
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J. F. Klausner
J. F. Klausner
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611
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G. E. Thorncroft
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611
J. F. Klausner
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611
J. Heat Transfer. Feb 1999, 121(1): 73-79 (7 pages)
Published Online: February 1, 1999
Article history
Received:
July 14, 1997
Revised:
July 30, 1998
Online:
December 5, 2007
Citation
Thorncroft, G. E., and Klausner, J. F. (February 1, 1999). "The Influence of Vapor Bubble Sliding on Forced Convection Boiling Heat Transfer." ASME. J. Heat Transfer. February 1999; 121(1): 73–79. https://doi.org/10.1115/1.2825969
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