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Cavitation nuclei in water exposed to transient pressures

Published online by Cambridge University Press:  20 April 2015

Anders Andersen
Affiliation:
Department of Physics and Center for Fluid Dynamics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
Knud Aage Mørch*
Affiliation:
Department of Physics and Center for Fluid Dynamics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
*
Email address for correspondence: [email protected]

Abstract

A model of skin-stabilized interfacial cavitation nuclei and their response to tensile and compressive stressing is presented. The model is evaluated in relation to experimental tensile strength results for water at rest at the bottom of an open water-filled container at atmospheric pressure and room temperature. These results are obtained by recording the initial growth of cavities generated by a short tensile pulse applied to the bottom of the container. It is found that the cavitation nuclei shift their tensile strength depending on their pressure history. Static pressurization for an extended period of time prior to testing is known to increase the tensile strength of water, but little information is available on how it is affected by compression pulses of short duration. This is addressed by imposing compression pulses of approximately 1 ms duration and a peak intensity of a few bar prior to the tension pulse. The observations are interpreted on the basis of the new model.

Type
Papers
Copyright
© 2015 Cambridge University Press 

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Andersen et al. supplementary movie

High-speed video of the CT-pulse cavitation in figure 12. Single-frame cavitation occurs followed by pulsating clusters until they all cease after about 2 ms. After a period with no activity, the T-pulse leads to inception of new as well as earlier observed bubbles in the subsequent frames.

Download Andersen et al. supplementary movie(Video)
Video 3 MB

Andersen et al. supplementary movie

High-speed video of the CT-pulse cavitation in figure 12. Single-frame cavitation occurs followed by pulsating clusters until they all cease after about 2 ms. After a period with no activity, the T-pulse leads to inception of new as well as earlier observed bubbles in the subsequent frames.

Download Andersen et al. supplementary movie(Video)
Video 86.1 KB