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Vish Prasad (open in a new tab) Department of Mechanical Engineering, University of North Texas, Denton, Texas 76207, USA
Yogesh Jaluria (open in a new tab) Department of Mechanical and Aerospace Engineering, Rutgers-New Brunswick, The State University of New Jersey, Piscataway, NJ 08854, USA
Zhuomin M. Zhang (open in a new tab) George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA

ISSN Print: 1049-0787

ISSN Online: 2375-0294

SJR: 0.363 SNIP: 0.21 CiteScore™:: 1.8

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Clarivate CBCI (Books) Scopus Google Scholar CNKI Portico Copyright Clearance Center iThenticate Scientific Literature

UNSTEADY HEAT TRANSFER IN A CHANNEL OBSTRUCTED BY AN IMMERSED BODY

pages 177-206
DOI: 10.1615/AnnualRevHeatTransfer.v5.60
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摘要

Channel flows obstructed by a rod and the related heat transfer were studied numerically and experimentally. From the numerical results, the flow was found to fluctuate in a highly periodic fashion and the Karman vortex formed downstream from the rod exhibited a crisscross motion in the obstructed channel flow. This crisscross motion was confirmed by a flow visualization experiment. From the viewpoint of time variation of instantaneous flow structure, the wavering motion of the separation layer on either side of the rod causes the high vorticity layer near the wall region to be lifted from the channel wall. The tip of this lifted tongue of the wall layer forms an isolated vortex and the circular fluid motion induced by the isolated vortex in the near wall region causes the washing action of the wall. The washing action entrains fresh and cooler fluid from the downstream side between the isolated vortex and the channel wall and is concluded to contribute to the enhancement of the wall heat transfer. From a statistical viewpoint, the presently studied periodic flow is different from turbulent flow in the sense that no irregularity of the flow fluctuation exists. However, this flow is similar to the turbulent flow in another sense that the values of uv and take a nonzero value in some region.

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