A series of numerical simulation of the flow and heat transfer in modeled counterflow heat exchangers with oblique wavy walls has been made toward optimal shape design of recuperators. The effects of oblique angles and amplitudes of the wavy walls are systematically evaluated, and the heat transfer and pressure loss characteristics are investigated. It is found that counter-rotating streamwise vortices are induced by the wavy walls, and the flow field has been drastically modified due to the intense secondary flow. By using the optimum set of oblique angle and wave amplitude, significant heat transfer enhancement has been achieved at the cost of relatively small pressure loss, and the factor becomes much larger than that of straight square duct or conventional compact recuperators. When thermal coupling of hot and cold fluid passages is considered, the heat transfer is found to be strongly dependent on the arrangement of counterflow passages. The total heat transfer surface area required for a given pumping power and heat transfer rate can be reduced by more than 60% if compared to the straight square duct.
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e-mail: kmrmt@se.ritsumei.ac.jp
e-mail: ysuzuki@thtlab.t.u-tokyo.ac.jp
e-mail: kasagi@thtlab.t.u-tokyo.ac.jp
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High Performance Recuperator With Oblique Wavy Walls
Kenichi Morimoto,
Kenichi Morimoto
Mem. ASME
Department of Mechanical Engineering,
e-mail: kmrmt@se.ritsumei.ac.jp
The University of Tokyo
, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan
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Yuji Suzuki,
Yuji Suzuki
Mem. ASME
Department of Mechanical Engineering,
e-mail: ysuzuki@thtlab.t.u-tokyo.ac.jp
The University of Tokyo
, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan
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Nobuhide Kasagi
Nobuhide Kasagi
Fellow ASME
Department of Mechanical Engineering,
e-mail: kasagi@thtlab.t.u-tokyo.ac.jp
The University of Tokyo
, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan
Search for other works by this author on:
Kenichi Morimoto
Mem. ASME
Department of Mechanical Engineering,
The University of Tokyo
, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japane-mail: kmrmt@se.ritsumei.ac.jp
Yuji Suzuki
Mem. ASME
Department of Mechanical Engineering,
The University of Tokyo
, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japane-mail: ysuzuki@thtlab.t.u-tokyo.ac.jp
Nobuhide Kasagi
Fellow ASME
Department of Mechanical Engineering,
The University of Tokyo
, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japane-mail: kasagi@thtlab.t.u-tokyo.ac.jp
J. Heat Transfer. Oct 2008, 130(10): 101801 (10 pages)
Published Online: August 7, 2008
Article history
Received:
September 27, 2006
Revised:
July 22, 2007
Published:
August 7, 2008
Citation
Morimoto, K., Suzuki, Y., and Kasagi, N. (August 7, 2008). "High Performance Recuperator With Oblique Wavy Walls." ASME. J. Heat Transfer. October 2008; 130(10): 101801. https://doi.org/10.1115/1.2884187
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