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http://dx.doi.org/10.3795/KSME-B.2004.28.8.910

Detailed Measurement of Heat/Mass Transfer in a Rotating Two-Pass Duct (I) - Effects of Rib Tubulators -  

Kim, Kyung-Min (연세대학교 대학원 기계공학과)
Kim, Sang-In (연세대학교 대학원 기계공학과)
Kim, Yun-Young (연세대학교 대학원 기계공학과)
Rhee, Dong-Ho (연세대학교 대학원 기계공학과)
Cho, Hyung-Hee (연세대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.28, no.8, 2004 , pp. 910-920 More about this Journal
Abstract
The heat/mass transfer characteristics in a rotating two-pass duct with and without rib turbulators are investigated in the present study. The square duct has a hydraulic diameter ($D_h$) of 26.7 mm, and $1.5\;mm{\times}1.5\;mm$ square $90^{\circ}$-rib turbulators are attached on the leading and trailing walls. The pitch-to-rib height ratio (p/e) is 10. The Reynolds number based on the hydraulic diameter is kept constant at 10,000 to exclude the Reynolds effect, and the rotation number is varied from 0.0 to 0.20. In the smooth duct, the curvature of the $180^{\circ}$-turn produces Dean vortices that enhance heat/mass transfer in the post-turn region. When rib turbulators are installed, heat/mass transfer is augmented 2.5 times higher than that of the smooth duct since the main flow is turbulated by reattaching and separating in the vicinity of the duct surfaces. The duct rotation results in heat/mass transfer discrepancy so that Sherwood number ratios are higher on the trailing surface in the first-pass and on the leading surface in the second-pass. In the turning region, Dean vortices shown in the stationary case transform into one large asymmetric vortex cell, and subsequent heat/mass transfer characteristics also change. As the rotation number increases, the heat/mass transfer discrepancy enlarges.
Keywords
Rotating Duct; Rib Turbulator; Heat/Mass Transfer; Dean Vortex; Coriolis Force; Naphthalene Sublimation Technique;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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