Heat/Mass Transfer Characteristics in A Rotating Duct with $\small{180^{\circ}}$ Turn

Title & Authors
Heat/Mass Transfer Characteristics in A Rotating Duct with $\small{180^{\circ}}$ Turn
Won, Chung-Ho; Lee, Sei-Young; Cho, Hyung-Hee;

Abstract
The present study investigates convective heat/mass transfer and flow characteristics inside a rotating two-pass rectangular duct. A naphthalene sublimation technique is employed to determine the detailed local heat transfer coefficients using the heat and mass transfer analogy. The objective of this study is to determine the effects of turning geometry with rotation for 0.0$\small{\leq}$Ro$\small{\leq}$0.24. The results reveal that the sharp-turn corner has the larger pressure drop and lower heat transfer in the post-turn region than those of the round-turn corner. The strong secondary flow enhances heat transfer for the round-turn corner. Coriolis force induced by the rotation pushes the high momentum core flow toward the trailing wall in the first passage with radially outward flow and toward the leading wall in the second passage with radially inward flow. Consequently, the high heat transfer rates are generated on the trailing surface and the leading surface in the first and second passage, respectively. However, the strong secondary flow due to the turning dominates the flow pattern in the second passage, thus the heat transfer differences between the leading and trailing surfaces are small with the rotation.
Keywords
Turbine Internal Passage;Rotating Duct;Duct Flow;Heat/Mass Transfer;
Language
Korean
Cited by
1.
회전하는 터빈 블레이드 내부 이차냉각유로에서 엇갈린요철과 평행요철이 열/물질전달에 미치는 영향,이세영;이동호;조형희;

대한기계학회논문집B, 2002. vol.26. 9, pp.1249-1259
2.
이차 냉각 유로를 가진 회전덕트에서 열/물질전달 특성 (I) - 요철 설치에 따른 영향 -,김경민;김상인;김윤영;이동호;조형희;

대한기계학회논문집B, 2004. vol.28. 8, pp.910-920
3.
곡관부를 가지는 내부 냉각유로에서 회전수 변화에 따른 열전달 및 유동 특성 ( I ) - 엇갈린 요철배열 덕트 -,김경민;김윤영;이동호;조형희;

대한기계학회논문집B, 2005. vol.29. 6, pp.737-746
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