RT Journal Article
ID 17c56a7410415cb2
A1 Arun, K.
A1 Prabhu, Santosh V.
T1 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
JF Journal of Enhanced Heat Transfer
JO JEH(T)
YR 2007
FD 2007-06-15
VO 14
IS 1
SP 27
OP 51
AB 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.
PB Begell House
LK https://www.dl.begellhouse.com/journals/4c8f5faa331b09ea,503a09b3663e2c25,17c56a7410415cb2.html