Abstract
This paper investigates rotational effects on secondary flow in rotating flow passages with sudden expansion or contraction. Consideration is given to laminar flow. The governing boundary-layer equations are discretized by means of a finite-difference technique and numerically solved to determine the distributions of velocity vector under the appropriate boundary conditions. The Reynolds number (Re) and rotation rate are varied to determine their effects on the formation ofsecondary flows. It is disclosed from the study that: (i) when laminar flow is introduced into an axially rotating pipe with expansion, the stretch ofthe secondary flow zone is amplified with an increase in the rotation rate and Re, and (ii) in contrast, for axially rotating pipe flows with contraction, the secondary flow region is somewhat suppressed due to pipe rotation, and the change is slightly affected by the rotation rate and Re. Results may find applications in automotive and rotating hydraulic transmission lines.
Highlights
The convective heat transfer in swirling flows is often encountered in chemical and mechanical mixing and separation devices, electrical and turbo-machinery, combustion chambers, pollution control devices, swirl nozzles, rocketry, and fusion reactors
Consideration is given to the influence of rotation ratio and Reynolds number on the formation of the secondary flows
When laminar flow passes in an axially rotating pipe with expansion, the pipe rotation causes the stretch of the secondary flows formed in the expansion region
Summary
1999, Vol 5, No 2, pp. 117-122 Reprints available directly from the publisher Photocopying permitted by license only (C) 1999 OPA (Overseas Publishers Association) N.V. Published by license under the Gordon and Breach Science Publishers imprint. Printed in Malaysia.
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