PIV Measurements Of Laminar Flow Around
A Hemisphere
Author(s)
A. Goharzadeh, L. Khezzar & A. Molki
Abstract
This paper presents an experimental study of laminar flow past a smoothed
hemisphere using the Particle Image Velocimetry technique. The experimental
setup consists of a rectangular channel, through which water flows over a 30-mm
diameter hemisphere mounted on a horizontal surface. From the measured
velocity distribution around the hemisphere a physical insight into the flow is
presented. Vertical and horizontal 2D velocity distributions are obtained for a
constant Reynolds number of Re=800, corresponding to a regime of laminar
flow. Measurements revealed the three dimensional structure of the flow
including a horseshoe vortex surrounding the hemisphere and arch-shaped
vortices in the downstream region. Both instantaneous and average velocity
distribution were studied. The location of the reattachment point, the separation
line, and the reverse flow are identified and discussed.
Keywords: PIV, horseshoe vortex, hemisphere, dome.
1 Introduction
Hemispherical shapes are widely used in many industrial applications such as
domed roofs in civil engineering to cover buildings or above-ground steel tanks
to store fluids. Domes were used in hydraulic channels as a mechanism to
generate and study the shedding of hairpin vortices in their wake [1]. Predicting
the three dimensional structure of flow field around a hemisphere is challenging
for engineers due to the complexity added by the curved surface. Therefore, in
order to ensure proper design of such engineering structures, detailed knowledge
of the flow structure around them is necessary.
Advances in Fluid Mechanics IX 29
Keywords
PIV, horseshoe vortex, hemisphere, dome.
Related Book
Other papers in this volume
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