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International Heat Transfer Conference 10

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

FLOW VISUALIZATION AND LAMINAR HEAT TRANSFER IN ROTATING CURVED SQUARE CHANNELS

K. C. Cheng
Department of Mechanical Engineering, University of Alberta Edmonton, Canada

Liqiu Wang
Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta T6G 2G8, CANADA

Abstract

Smoke visualization results for secondary flow phenomena are presented to study the destabilizing effects of Coriolis forces on fully developed laminar flow in rotating curved square channels (cross section = 5.08 × 5.08 cm2, radius of curvature Rc = 25.4 cm) at Reynolds number Re = 1,000 and rotating speeds in the range n = 17 ~ 332 rpm for both positive and negative rotations. Numerical results for secondary flow pattern, and friction factor and Nusselt number distributions along the wall are also presented for laminar forced convection heat transfer in rotating curved square channels for comparison. This study clarifies the basic flow characteristics regarding the interaction of the effect of rotation with centrifugal and viscous effects. The results are useful in assessing the validity of such assumptions as steady flow, flow symmetry and the transition from laminar to turbulent flow in laminar forced convection heat transfer analysis in rotating curved square channels.

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