Buoyancy-Driven Flow Reversal Phenomena in Radially Rotating Serpentine Ducts-Reference-Cited by-同舟云学术

Buoyancy-Driven Flow Reversal Phenomena in Radially Rotating Serpentine Ducts

Published:1999-10-01 Issue:1 Volume:122 Page:179-183
ISSN:0022-1481
Container-title:Journal of Heat Transfer
language:en
Short-container-title:

Author:

Hwang J. J.¹,Wang W.-J.¹,Chen Cha’o Kuang¹

Affiliation:

1. Department of Mechanical Engineering, Chung-Hua University, Hsinchu, Taiwan 300, Republic of China

Abstract

Convective characteristics are analyzed numerically in a rotating multipass square duct connecting with 180-deg sharp returns. Isoflux is applied to each duct wall and periodic conditions are used between the entrance and exit of a typical two-pass module. Emphasis is placed on the phenomenon of buoyancy-driven reversed flow in the serpentine duct. Predictions reveal that the radial distance from the rotational axis to the location of flow separation in the radial-outward duct decreases with increasing the Richardson number. In addition, the local buoyancy that is required to yield the radial flow reversal increases with increasing the rotation number. This buoyancy-driven reversed flow in the radial-outward duct always results in local hot spots in the cooling channels. The critical buoyancy for the initiation of flow reversal is therefore concluded for the design purpose. [S0022-1481(00)01101-4]

Publisher

ASME International

Subject

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

Link

http://asmedigitalcollection.asme.org/heattransfer/article-pdf/122/1/179/5911741/171_1.pdf

Reference10 articles.

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2. Wagner, J. H., Johnson, B. V., and Kopper, F. C., 1991, “Heat Transfer in Rotating Serpentine Passages With Smooth Walls,” Trans. ASME J. Turbomachinery, 113, pp. 321–330.

3. Hwang, J. J., and Lai, D. Y., 1998, “Three Dimensional Mixed Convection in a Rotating Multiple-Pass Square Channel,” Int. J. Heat Mass Transf., 41, pp. 979–991.

4. Prakash, C. V., and Zerkle, R., 1992, “Prediction of Turbulent Flow and Heat Transfer in a Radially Rotating Square Duct,” Trans. ASME J. Turbomachinery, 114, pp. 835–846.

5. Dutta, S., Andrews, M. J., and Han, J. C., 1996, “On Flow Separation With Adverse Rotational Buoyancy,” Trans. ASME, Ser. C: J. Heat Transfer, 118, pp. 977–979.

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