Investigations on inward flow between two stationary parallel disks

The present study examines the effect of acceleration on flow field. Both experimental and numerical methods have been employed to study the problem. Fluid enters through the peripheral gap between two concentric disks and converges to the center where it discharges axially through a hole in one of the disks. The mean flow governing equations have been solved in the numerical study. A low Reynolds number k-epsilon model has been used to model the Reynolds stresses. The experimental study involves the measurement of velocity field and turbulence intensity with laser Doppler anemometery. Both the studies show the change in flow regime from turbulent to laminar. The numerical study reveals that the acceleration parameter is not the only factor governing turbulent-laminar transition in this flow, the gap ratio also plays a significant role. (C) 1999 Elsevier Science Inc.

Analysis of laminar flow and heat transfer between a stationary and a rotating disk

LAMINAR flow and heat transfer between a stationary and a rotating disk has been analyzed numerically. The fluid enters the domain through a circular opening in the center of the stationary disk and flows radially outward. Unlike most of the earlier analyses, which were of the boundary-layer type, the present study deals with the solution of the complete Navier-Stokes equations and the prediction of the entire recirculating flow. Results show that, in the presence of rotation, the flow is indeed quite complex and is characterized by recirculating zones near the inlet and the exit. © 1985 American Institute of Aeronautics and Astronautics, Inc., All rights reserved