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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

DESTABILIZING EFFECT OF HEAT ON COHERENT STRUCTURES

R. N. Kieft
Faculty of Mechanical Engineering Eindhoven University of Technology P.O. Box 513, 5600 MB Eindhoven, the Netherlands

Camilo C. M. Rindt
Eindhoven University of Technology, Department of Mechanical Engineering, P.O.Box 513, 5600MB Eindhoven, The Netherlands

Anton A. van Steenhoven
Faculty of Mechanical Engineering, Energy Technology Section, Den Dolech 2, 5600MB, Eindhoven, The Netherlands

Abstract

The effect of heat on coherent vortex structures shed from a cylinder is investigated numerically and experimentally for ReD ~ 75 and RiD = 0 − 1.2. For the experimental investigation a High Resolution Particle Velocimetry (Hi-Res PV) method is used. For the numerical investigation a Spectral Element Method is used. Both investigations show that for relatively small heat input (RiD < 1) the vortex street deflects in the direction of the gravity force. Besides, subsequently shed structures show a relative rotation around each other, causing an unstable vortex street. For higher heat input the vortex structures itself become unstable. Three-dimensional structures are formed inside vortices shed from the upper half of the cylinder, occasionally leading to an early breakdown of the vortex street.