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http://dx.doi.org/10.3795/KSME-B.2008.32.3.198

Effective Heat Transfer Using Large Scale Vortices  

Yoon, Dong-Hyeog (인하대학교 대학원)
Choi, Choon-Bum (인하대학교 대학원)
Lee, Kyong-Jun (인하대학교 대학원)
Yang, Kyung-Soo (인하대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.32, no.3, 2008 , pp. 198-206 More about this Journal
Abstract
A numerical study has been carried out to investigate heat transfer enhancement in channel flow using large-scale vortices. A square cylinder, inclined with respect to the main flow direction, is located at the center of the channel flow, generating a separation region and Karman vortices. Two cases are considered; one with a fixed blockage ratio and the other one with a fixed cylinder size. In both cases, the flow characteristics downstream of the cylinder significantly change depending on the inclination angle. As a result, heat transfer from channel wall is significantly enhanced due to increased vertical-velocity fluctuations induced by the large-scale vortices shed from the cylinder. Quantitative results as well as qualitative physical explanation are presented to justify the effectiveness of the inclined square cylinder as a vortex generator to enhance heat transfer from channel wall.
Keywords
Heat Transfer Enhancement; Inclined Square Cylinder; Channel Flow; Immersed Boundary Method;
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