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ISSN: 1065-5131 Print
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DOI: 10.1615/JEnhHeatTransf.v14.i1
Pages: 95
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DOI: 10.1615/JEnhHeatTransf.v14.i1.20
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Article price - $35.00 |
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Effect of Rotation, Aspect Ratio, Channel Orientation, and Rib Pitch-to-Height Ratio on Pressure Drop and Heat Transfer Characteristics in a Rotating Channel with Ribs on One Principal Wall
K. Arun
Department of Mechanical Engineering, Indian Institute of Technology, Bombay Powai, Mumbai — 400 076, India
Santosh V. Prabhu
Department of Mechanical Engineering, Indian Institute of Technology, Bombay Powai, Mumbai – 400 076, India
ABSTRACT
The present investigation involves the study of the effects of rotation, channel aspect ratio, orientation angle, and rib pitch-to-height ratio on the friction factor and heat transfer in a rotating one-wall-ribbed channel. The rib angle with respect to the mainstream flow direction is 90°. Channels of aspect ratio one and two with two rib pitch-to-height ratios (P/e) of 5 and 10 at a constant rib height-to-hydraulic diameter ratio (e/D) of 0.1 are considered. Friction factors are obtained by experimental pressure drop measurements with water as the working fluid and the heat transfer results are obtained by numerical modeling using the v2−f turbulence model with air as the working fluid. Experiments are conducted for the Reynolds number ranging from 13,000 to 17,000 with the rotation number varying from 0−0.38. Orientation angle is varied from 0° to 180° in steps of 30° to change the channel orientation for pressure drop measurements. Friction factor ratios of the rectangular channel are slightly higher (around 3−10%) than those of the square channel for a given rotation number, rib pitch-to-height ratio, and orientation angle. Friction factors of a rib pitch-to-height ratio of 5 are higher than those of 10 in both square and rectangular channels at orientation angles of 45° and 90° under conditions of rotation. Numerical prediction of heat transfer distribution is carried out at a constant Reynolds number of 30,000 with rotation number varying within 0−0.3 and three orientation angles of 0°, 45°, and 90°. Under conditions of rotation, it is observed that the square channels oriented at 0°, with a rib pitch-to-height ratio of 10 results in higher heat transfer augmentation whereas at 45° and 90° orientation angles, rectangular channels with a rib pitch-to-height ratio of 10 results in higher heat transfer.
pages 27-51
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