Author:
SHEEN H. J.,CHEN W. J.,WU J. S.
Abstract
In this paper, an experimental investigation is described for a
concentric annular
flow over an axisymmetric sudden expansion by using both flow visualization
and
laser-Doppler anemometry (LDA) techniques. Depending upon the value of
the
Reynolds number and whether the Reynolds number was increased or decreased,
four typical flow patterns were classified according to the characteristics
of the
central and corner recirculation zones. The flow patterns are open annular
flow,
closed annular flow, vortex shedding, and stable central flow. Bifurcation
for this
flow occurred when 230 < Re < 440, which was verified by
observing the variation
of the reattachment length. The spatial growth of velocity fluctuations
from the
measurements demonstrated a tendency that shedding vortices behind the
centrebody
more strongly affect the reattachment length than flows without a centrebody.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
23 articles.
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