Hydrodynamics Of Long Jet Impingement
Author(s)
M. M. Seraj & M. S. Gadala
Abstract
A circular turbulent long jet has been assessed numerically using the
volume-of-fluid method to examine the hydrodynamics of a long jet before
impingement and to inspect the flow structure of a radial thin layer spreading
over a flat plate after impingement. Typical steel mill industrial parameters are
used in the model. Comparative results are shown for laminar and turbulent jets
with different turbulence models. Model results showed good agreement with the
analytical solution available for global parameters and jet behaviour. The film
thickness of the water layer over the plate, for more than 27 jet diameter, was
measured by tracking free-surface. A hydraulic jump was detected and occurred
within the radial zone in different shapes in laminar and turbulent modelling,
respectively.
Keywords: hydrodynamics, long jet, numerical simulation, hydraulic jump.
1 Introduction
Jet impingement is one of the effective means in cooling and heating
applications. Water jet impingement has a distinguished ability to dissipate a
large amount of heat fluxes and has attracted many studies over the past few
decades. Recent reviews may be found in [1–3].
In an axisymmetric jet, the jet thickness decreases as the liquid radially
travels outward. The thickness of the liquid sheet initially decreases with the
radius but, because viscous drag slows the liquid sheet, its thickness begins to
increase at larger radii. The rapid thickness decrease brings the growing
boundary layer into contact with the free-surface of the liquid layer. If the
Reynolds number is large enough, a shift to a turbulent regime could be expected
for the radially spreading thin laminar liquid film. Layer thickening after
thinning marks the radius of transition [3, 4].
Keywords
hydrodynamics, long jet, numerical simulation, hydraulic jump.
Related Book
Other papers in this volume
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