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International Heat Transfer Conference 13

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

HEAT TRANSFER IN RECTANGULAR CHANNELS (AR=4:1) WITH NORMAL TRIPS AT HIGH ROTATION NUMBERS

DOI: 10.1615/IHTC13.p20.230
12 pages

F. Zhou
Mechanical Engineering Department, Louisiana State University, Baton Rouge, Louisiana 70803, USA

Sumanta Acharya
Illinois Institute of Technology

Abstract

Heat transfer measurements are reported for rotating 4:1 aspect ratio (AR) coolant passages with ribs normal to the flow. The study covers Reynolds number (Re) in the range of 10,000-70,000, rotation number (Ro) in the range of 0-0.6, and density ratios (DR) between 0.1-0.2. These measurements are done in a rotating heat transfer rig utilizing segmented foil heated elements and thermocouples, with slip rings providing the interface between the stationary and rotating frames. The results are compared with the data previously published for a square channel (AR=1:1) with same dimensionless rib geometry. The present results are consistent with the 1:1 AR observations, and show that rotation enhances the heat transfer on the destabilized walls (inlet-trailing wall and outlet-leading wall), and decreases the heat transfer ratio on the stabilized walls (inlet-leading wall and outlet-trailing wall). However, the magnitude of the rotational effects in the inlet channel of the 4:1 AR are considerably weaker than the corresponding 1:1 AR case. The rotation effects on the inlet-leading wall in the present study, when Re=10,000 and Re=25,000, is found to be completely different from that observed on the smooth channel with the same AR, where rotation causes heat transfer on the inlet-leading wall to increase with Ro.

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Measurement of fluid temperature with an arrangement of three thermocouples