The Cavermod device, as described in the companion paper (Filali et al., 1999), allows us to produce the axial collapse of a cavitating vortex at high velocities. From a global point of view, we can consider that it produces a high momentum in the axial direction. Large forces, concentrated on a small area and able to produce erosion pits on hard materials, result from the sudden momentum stopping against a solid wall. In this paper, the results of the forces measurements are given. Four different measurements devices are used to analyze the Cavermod performance in both cases of long and short vortex: dislocations in MgO (Magnesium Oxide) single crystal, two special piezoelectric ceramic transducers and a PVDF film transducer. Special attention is given to the PVDF film response which is found twice the response of other devices. In addition, an attempt is made to interpret the temporal force signal given by a ceramic transducer in terms of local erosive pressure.

Issue Section:
Research Papers
Topics:
Ceramics, Collapse, Crystals, Dislocations, Erosion, Force measurement, Hard materials, Magnesium (Metal), Momentum, Piezoelectric ceramics, Pressure, Signals, Transducers, Vortices
1.
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2.
Dominguez-Cortazar
M. A.
,
Franc
J. P.
, and
Michel
J. M.
,
1997
, “
The Erosive Axial Collapse of a Cavitating Vortex: an Experimental Study
,”
ASME JOURNAL OF FLUIDS ENGINEERING
, Vol.
119
, pp.
686
–
691
.
3.
Dufrane
K. F.
, and
Glaeser
W. A.
,
1976
, “
Rolling-Contact Deformation of MgO Single Crystals
,”
Wear
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37
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21
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32
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4.
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5.
Filali
E. G.
, and
Michel
J. M.
,
1999
, “
The Cavermod Device: Hydrodynamic Aspects and Erosion Tests
,”
ASME JOURNAL OF FLUIDS ENGINEERING
, Vol.
121
, published in this issue pp.
305
–
311
.
6.
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P.
,
Alloncle
A. P.
, and
Dufresne
D.
,
1990
, “
Collective Effects of Cavitation: Experimental Study of Bubble-Bubble and Bubble-Shock Wave Interactions
,”
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S.
,
Miyoshi
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Buckley
D. H.
, and
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T.
,
1988
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Plastic Deformation of Magnesium Oxide {001} Surface Produced by Cavitation
,”
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8.
Jones
I. R.
, and
Edwards
D. H.
,
1960
, “
An Experimental Study of the Forces Generated by the Collapse of Transient Cavities in Water
,”
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9.
Nguyen, T. H., 1994, “De´veloppement et validation d’une me´thode analytique de pre´vision de l’e´rosion de cavitation,” P.H.D. thesis, INPG, Grenoble, France.
10.
Okada, T., Hattori, S., and Shimizu, M., 1994, “A Fundamental Study of Cavitation Erosion using a Magnesium Oxide Single Crystal: Dislocations and Surface Roughness,” Proceedings of the 2nd International Symposium on Cavitation, Tokyo, pp. 185–190.
11.
Soyama, et al., 1999, paper accepted for publication in the ASME JOURNAL OF FLUIDS ENGINEERING.
12.
Tomita
Y.
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Shima
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Mechanism of Impulsive Pressure Generation and Damage Pit Formation by Bubble Collapse
,”
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