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http://dx.doi.org/10.3795/KSME-B.2005.29.5.590

Experimental Study of Heat/Mass Transfer in Rotating Cooling Passages with Discrete Ribs  

Kim Kyung Min (연세대학교 대학원 기계공학과)
Kim Sang In (연세대학교 대학원 기계공학과)
Lee Dong Ho (연세대학교 기계공학과)
Cho Hyung Hee (연세대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.29, no.5, 2005 , pp. 590-598 More about this Journal
Abstract
The present study has been conducted to investigate the effect of discrete ribs and rotation on heat/mass transfer characteristics in a two-pass square duct with $90^{\circ}-rib$ turbulators. The rib turbulator has a square cross section of 1.5 mm. The rib height-to-hydraulic diameter ratio $({e/D_{h})$ is 0.056, and the rib pitch-to-rib height ratio (p/e) is 10. The gap width is the same as the rib height. The rotation number ranges from 0.0 to 0.2 while Reynolds number is fixed to 10,000. In a stationary duct, the heat/mass transfer on the surfaces with discrete ribs is enhanced because the gap flow promotes local turbulence and flow mixing near the ribbed surface. In a rotating duct, the gap flow affects differently the heat/mass transfer on leading and trailing surfaces with discrete ribs. On the leading surface of the first pass, heat/mass transfer is increased due to the gap flow. On the trailing surface of the first pass, however, heat/mass transfer is decreased because the gap flow disturbs reattachment of main flow. The phenomenon, that is, the difference of heat transfer between the leading and the trailing surfaces is distinctly presented by rotation.
Keywords
Coriolis Force; Discrete Rib; Heat/Mass Transfer; Naphthalene Sublimation Technique; Rib Turbutator;
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