Cavitation behind a circular cylinder is studied with the aid of highly time-resolved images at a constant Reynolds number of 64,000. Apart from recording the overall cavitation activity behind the cylinder, the study also delves into the dynamics of individual cavities. The length of cavity scales with cavitation number and this scaling is similar to the existing results obtained in flow regimes different from that presented here. Dynamics of individual cavities show distinct phases of cavity formation, growth, and collapse. At lower cavitation numbers, cavity collapse was followed by a rebounce. Variation of area normalized by the length of cavity shows self similarity in the growth phase of cavities for different cavitation numbers. Thus, the cavity length is the suitable length scale for dynamics of cavities, at least for the growth phase. The cavity lifetime scales inversely with the square of cavitation number. Dynamics of individual small cavity captured at higher frame rates was found to be similar to that of an isolated bubble. In this case, a rapid collapse follow a more gradual expansion phase, unlike that shown by larger cavities.

References

References
1.
Roshko
,
A.
,
1961
, “
Experiments on the Flow Past a Circular Cylinder at Very High Reynolds Number
,”
J. Fluid Mech.
,
10
(
03
), pp.
345
356
.
2.
Sumer
,
B. M.
, and
Fredsoe
,
J.
,
2006
,
Hydrodynamics Around Cylindrical Structures
,
World Scientific Publishing Ltd.
,
Singapore
.
3.
Sumner
,
D.
, and
Akosile
,
O.
,
2003
, “
On Uniform Planar Shear Flow Around a Circular Cylinder at Subcritical Reynolds Number
,”
J. Fluids Struct.
,
18
(3–4), pp.
441
454
.
4.
Varga
,
J.
, and
Sebestyen
,
G.
,
1965
, “
Experimental Investigations of Some Properties of Cavitating Flow
,”
Period. Polytech.
,
9
(3), pp.
243
254
.
5.
Young
,
J. O.
, and
Hall
,
W. J.
,
1966
, “
Effects of Cavitation on Periodic Wakes Behind Symmetric Wedges
,”
ASME J. Basic Eng.
,
88
(
1
), pp.
163
176
.
6.
Ihara
,
A.
, and
Murai
,
H.
,
1986
, “
Cavitation Inception on a Circular Cylinder at Critical and Supercritical Flow Range
,”
ASME J. Fluids Eng.
,
108
(
4
), pp.
421
427
.
7.
Matsudaira
,
Y.
,
Gomi
,
Y.
, and
Oba
,
R.
,
1992
, “
Characteristics of Bubble-Collapse Pressures in a Karman-Vortex Cavity
,”
JSME Int. J., Ser. II
,
35
(2), pp.
179
185
.
8.
Sato
,
K.
,
Liu
,
Z.
, and
Brennen
,
C. E.
,
1993
, “
The Micro-Bubble Distribution in the Wake of Cavitating Circular Cylinder
,” ASME Cavitation and Multiphase Flow Forum, Vol. FED-153, American Society of Mechanical Engineers, New York, pp. 75–80.
9.
Wykes
,
M. E. P.
,
1978
, “
Experimental Studies of Viscous Effects on Cavitation
,” Ph.D. thesis, St. John's College, University of Oxford, Oxford, UK.
10.
Balachandar
,
R.
, and
Ramamurthy
,
A. S.
,
1999
, “
Pressure Distribution in Cavitating Circular Cylinder Wakes
,”
J. Eng. Mech.
,
125
(
3
), pp.
356
358
.
11.
Kumar
,
T. M. P.
,
2012
, “
Experimental and Numerical Investigation of Non-Cavitating and Cavitating Flows Over s-Shaped Hydrofoil
,” Ph.D. thesis, Indian Institute of Technology, Madras, India.
12.
Kumar
,
T. M. P.
,
Kumar
,
P.
, and
Chatterjee
,
D.
,
2014
, “
Cavitation Characteristics of S-Blade Used in Fully Reversible Pump-Turbine
,”
ASME J. Fluids Eng.
,
136
(
5
), p. 051101.
13.
Moffat
,
R. J.
,
1988
, “
Describing the Uncertainties in Experimental Results
,”
Exp. Therm. Fluid Sci.
,
1
(
1
), pp.
3
17
.
14.
Kumar
,
P.
,
Chatterjee
,
D.
, and
Bakshi
,
S.
,
2017
, “
Experimental Investigation of Cavitating Structure in the Near Wake of a Cylinder
,”
Int. J. Multiphase Flow
,
89
, pp. 207–217.
15.
Bruschi
,
G.
,
Nishioka
,
T.
,
Tsang
,
K.
, and
Rick
,
W. R.
,
2003
, “
A Comparison of Analytical Methods Drag Coefficient of a Cylinder
,” Mechanical and Aerospace Engineering (MAE), University of California, Los Angeles, CA.
You do not currently have access to this content.