The paper presents an experimental study of heat∕mass transfer coefficient in 4:1 aspect ratio smooth channels with nonuniform cross sections. Curved leading and trailing edges are studied for two curvatures of 9.06 (0.23 and 15.11 (0.384 and for two different curvature configurations. One configuration has curved walls with curvature corresponding to the blade profile (positive curvature on both leading and trailing walls) and the other configuration has leading and trailing walls that curve inward into the coolant passage (negative curvature on the leading surface and positive curvature on the trailing surface). A detailed study at Re=10,000 with rotation numbers in the range of 0–0.07 is undertaken for the two different curvature configurations. All experiments are done for a 90 deg passage orientation with respect to the plane of rotation. The experiments are conducted in a rotating two-pass coolant channel facility using the naphthalene sublimation technique. Only the radially outward flow is considered for the present study. The spanwise mass transfer distributions of fully developed regions of the channel walls are also presented. The mass transfer data from the curved wall channels are compared to those from a smooth 4:1 rectangular duct with similar flow parameters. The local mass transfer data are analyzed mainly for the fully developed region, and area-averaged results are presented to delineate the effect of the rotation number. Heat transfer enhancement especially in the leading wall is seen for the lower curvature channels, and there is a subsequent reduction in the higher curvature channel when compared to the 4:1 rectangular smooth channel. This indicates that an optimal channel wall curvature exists for which heat transfer is the highest.
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April 2009
Research Papers
Mass∕Heat Transfer in Rotating, Smooth, High-Aspect Ratio (4:1) Coolant Channels With Curved Walls
Eashwar Sethuraman,
Eashwar Sethuraman
Turbine Innovation and Energy Research (TIER) Center, Mechanical Engineering Department,
Louisiana State University
, Baton Rouge, LA 70803
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Sumanta Acharya,
Sumanta Acharya
Turbine Innovation and Energy Research (TIER) Center, Mechanical Engineering Department,
Louisiana State University
, Baton Rouge, LA 70803
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Dimitris E. Nikitopoulos
Dimitris E. Nikitopoulos
Turbine Innovation and Energy Research (TIER) Center, Mechanical Engineering Department,
Louisiana State University
, Baton Rouge, LA 70803
Search for other works by this author on:
Eashwar Sethuraman
Turbine Innovation and Energy Research (TIER) Center, Mechanical Engineering Department,
Louisiana State University
, Baton Rouge, LA 70803
Sumanta Acharya
Turbine Innovation and Energy Research (TIER) Center, Mechanical Engineering Department,
Louisiana State University
, Baton Rouge, LA 70803
Dimitris E. Nikitopoulos
Turbine Innovation and Energy Research (TIER) Center, Mechanical Engineering Department,
Louisiana State University
, Baton Rouge, LA 70803J. Turbomach. Apr 2009, 131(2): 021002 (9 pages)
Published Online: January 22, 2009
Article history
Received:
July 25, 2006
Revised:
September 18, 2006
Published:
January 22, 2009
Citation
Sethuraman, E., Acharya, S., and Nikitopoulos, D. E. (January 22, 2009). "Mass∕Heat Transfer in Rotating, Smooth, High-Aspect Ratio (4:1) Coolant Channels With Curved Walls." ASME. J. Turbomach. April 2009; 131(2): 021002. https://doi.org/10.1115/1.2812327
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