Detailed heat transfer distributions in two-pass square channels with rib turbulators

Detailed Nusselt number distributions are presented for a two-pass square channel with one ribbed wall. This wall of the channel is sprayed with thermochromic liquid crystals, and a transient test is run to obtain the local heat transfer coefficients. Results are presented for Reynolds numbers ranging from 6000 to 60 000. The rib height-to-hydraulic diameter ratio is 0.125; the rib pitch-to-height ratio is 10; and the rib configurations are 90° parallel, 60° parallel, 60° V, and 60° broken V. Detailed measurements are presented in the first pass, before the 180° turn, in the turn region, after the turn, and further downstream in the second pass. The detailed distributions provide a clear understanding of the secondary flows induced by the 180° turn and the rib turbulators. © 1997 Elsevier Science Ltd. All rights reserved.

Detailed heat transfer distributions in two-pass square channels with rib turbulators Academic Article