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http://dx.doi.org/10.3795/KSME-B.2005.29.6.737

Effects of Rotation Speed on Heat Transfer and Flow in a Coolant Passage with Turning Region ( I ) - Cross Ribbed Duct -  

Kim Kyung Min (연세대학교 대학원 기계공학과)
Kim Yun Young (연세대학교 대학원 기계공학과)
Rhee Dong Ho (연세대학교 기계공학과)
Cho Hyung Hee (연세대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.29, no.6, 2005 , pp. 737-746 More about this Journal
Abstract
The present study investigates heat/mass transfer and flow characteristics in a ribbed rotating passage with turning region. The duct has an aspect ratio (W/H) of 0.5 and a hydraulic diameter ($D_h$) of 26.67 mm. Rib turbulators are attached in the cross arrangement on the leading and trailing surfaces of the passage. The ribs have a rectangular cross section of $2\;mm\;(e){\times}\;mm\;(w)$ and an attack angle of $70^{\circ}$. The pitch-to-rib height ratio (p/e) is 7.5, and the rib height-to-hydraulic diameter ratio ($e/D_h$) is 0.075. The rotation number ranges from 0.0 to 0.20 while the Reynolds number is constant at 10,000. To verify the heat/mass transfer augmentation, internal flow structures are calculated for the same conditions using a commercial code FLUENT 6.1. The heat transfer data of the smooth duct for various Ro numbers agree well with not only the McAdams correlation but also the previous studies. The cross-rib turbulators significantly enhance heat/mass transfer in the passage by disturbing the main flow near the surfaces and generating one asymmetric cell of secondary flow skewing along the ribs. Because the secondary flow is induced in the first-pass and turning region, heat/mass transfer discrepancy is observed in the second-pass even for the stationary case. When the passage rotates, heat/mass transfer and flow phenomena change. Especially, the effect of rotation is more dominant than the effect of the ribs at the higher rotation number in the upstream of the second-pass.
Keywords
Coriolis Force; Dean Vortex; Heat/Mass Transfer; Naphthalene Sublimation Technique; Rotating Duct;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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