Lift Forces On A Circular Cylinder In Cross Flow
Resulting From Heat/mass Transfer
Author(s)
Z. Trávníček, F. Maršík, T. Vít, Z. Broučková & M. Pavelka
Abstract
The well-known Magnus effect is the phenomenon responsible for the curved
streamlines around rotating cylinders or balls. In other words, the phenomenon
causes the curved motion of spinning balls and missiles. A related application is
the Flettner rotor ship, which was designed to use the Magnus effect for
propulsion. More generally, the Kutta-Joukowski theorem determines lift as the
product of upstream velocity, fluid density, and circulation. Flow visualization
experiments of cylinders in a cross flow demonstrate this effect. For comparison
purposes, a classical potential solution is presented with the same parameters
(with the Reynolds number of 920). The present study assumes that similar
effects can be created by means of a non-symmetrical heat/mass transfer from a
section of the bluff body. A theoretical model was derived, based on equations of
momentum, mass, and energy balance. The derivation utilized the terms of the
entropy gradient, and the resulting velocity circulation around the body. A
circular cylinder with a mass transfer surface was suggested. The mass transfer,
namely the evaporation of water, is proposed through a selected 90° segment of
the cylinder surface.
Keywords: cylinder in cross flow, Magnus effect, active flow control.
Keywords
Keywords: cylinder in cross flow, Magnus effect, active flow control.
Related Book
Other papers in this volume
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