Model
Digital Document
Publisher
Florida Atlantic University
Description
The transition of two dimensional flow within a crack
with oscillating wall is studied experimentally to establish
the role of the parameters involved. Multiple instabilities
in the fluid are produced by the motion of the oscillating
wall. For a better understanding of the flow structure and
displaying in the whole flow field at a time, flow
visualization was used. Frequency, amplitude, and crack
width were systematically varied. The present study shows
that, in general, the frequency and crack width play a role
in the transition process at low frequencies of
oscillations. However, amplitude becomes progressively
important at its higher range. Results also show that the
flow changes its character approximately after a Reynolds
number 11420. After that the transition process continues
until the Reynolds number 34322 which is the upper limit of
variation of frequency (Reynolds number) in the present
study.
with oscillating wall is studied experimentally to establish
the role of the parameters involved. Multiple instabilities
in the fluid are produced by the motion of the oscillating
wall. For a better understanding of the flow structure and
displaying in the whole flow field at a time, flow
visualization was used. Frequency, amplitude, and crack
width were systematically varied. The present study shows
that, in general, the frequency and crack width play a role
in the transition process at low frequencies of
oscillations. However, amplitude becomes progressively
important at its higher range. Results also show that the
flow changes its character approximately after a Reynolds
number 11420. After that the transition process continues
until the Reynolds number 34322 which is the upper limit of
variation of frequency (Reynolds number) in the present
study.
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