Study of Mixing and Augmentation of Natural Convection Heat Transfer by a Forced Jet in a Large Enclosure-Reference-Cited by-同舟云学术

Study of Mixing and Augmentation of Natural Convection Heat Transfer by a Forced Jet in a Large Enclosure

Published:2002-07-16 Issue:4 Volume:124 Page:660-666
ISSN:0022-1481
Container-title:Journal of Heat Transfer
language:en
Short-container-title:

Author:

Kuhn Shine-Zen (Joseph)¹,Kang Hwan Kook²,Peterson Per F.¹

Affiliation:

1. University of California, Berkeley, Department of Nuclear Eng., Berkeley, CA 94720-1730

2. Dae Hong Enterprise Co., 30 Yangpyung-Dong-4ga, Young Deung Po-Gu, Seoul, Korea, 150-104

Abstract

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 RaD1/3, and under strong forced convection, by the jet Reynolds number Rej2/3. 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.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Link

http://asmedigitalcollection.asme.org/heattransfer/article-pdf/124/4/660/5912746/660_1.pdf

Reference17 articles.

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