This paper presents an experimental study of gas mixing processes and heat transfer augmentation by a forced jet in a large cylindrical enclosure with an isothermal bottom heating/cooling surface. Cold/hot air was injected at several positions with varying pipe diameters and injection orientations, and was removed from the top of the enclosure. Under natural convection, the mean Nusselt number was correlated by the enclosure Rayleigh number and under strong forced convection, by the jet Reynolds number A combining rule for mixed convection was found for both the stabilizing (cooled surface) and destabilizing (heated surface) density gradients. Using the ratio of forced and free convection Nusselt numbers, this correlation could be further reduced to predict forced-jet augmentation as a function of the Archimedes number, with a correction factor to account for jet orientation and enclosure aspect ratio.
Study of Mixing and Augmentation of Natural Convection Heat Transfer by a Forced Jet in a Large Enclosure
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division July 9, 2001; revision received March 14, 2002. Associate Editor: K. S. Ball.
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Kuhn, S. (., Kang, H. K., and Peterson, P. F. (July 16, 2002). "Study of Mixing and Augmentation of Natural Convection Heat Transfer by a Forced Jet in a Large Enclosure ." ASME. J. Heat Transfer. August 2002; 124(4): 660–666. https://doi.org/10.1115/1.1482081
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