Recent Developments in Cavitation Mechanisms - 1st Edition - ISBN: 9781782421757, 9781782421764

Recent Developments in Cavitation Mechanisms

1st Edition

A Guide for Scientists and Engineers

Authors: Seiichi Washio
eBook ISBN: 9781782421764
Hardcover ISBN: 9781782421757
Imprint: Woodhead Publishing
Published Date: 25th July 2014
Page Count: 288
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Description

How does cavitation start? Presently, the nucleus theory provides the answer to this fundamental question. However the idea of nuclei contains inaccuracies that cannot be rationalized. Recent Developments in Cavitation Mechanisms discusses the uncertainties surrounding the nucleus theory, and proposes another theory of cavitation mechanism. Characteristically, the new theory is based on recent discoveries of cavity generation phenomena in separating flows. This book consists of chapters that introduce topics such as unsoundness of cavitation nuclei, and phenomena of cavity generation on walls of flow separation in hydraulic oil and water flows. Subsequent chapters cover the mechanism of cavity generation at point of flow separation, nucleation by contact motion between solids in liquid and a proposal of new cavitation mechanism based on flow separation and solid contact. The final chapters present the demonstration of a new mechanism in the hydraulic poppet valve and a concluding summary.

Key Features

  • proposes a new mechanism of cavitation inception in liquid machines
  • describes in detail phenomena of cavity generation at point of flow separation recently discovered by the author
  • discusses peculiar properties of flow separation as cause of cavity generation
  • presents abundant experimental data of incipient cavitation obtained with high resolution of time and space
  • provides supplementary materials of slow motion videos that can help understand the very rapid and minute phenomena of cavity generation which has been discovered by the author and will be still unfamiliar to many

Readership

Scientists and engineers involved with cavitation; students studying cavitation; researchers with an interest in cavitation nuclei in liquid.

Table of Contents

  • List of figures and tables
  • Preface
  • Acknowledgements
  • About the author
  • 1. Review of cavitation nuclei
    • Abstract:
    • 1.1 Traditional pictures of nuclei
    • 1.2 Nuclei in hydraulic mineral oil
    • 1.3 Unsoundness of traditional nuclei models
    • 1.4 Tribonucleation
    • 1.5 Appendix I: Saturated solubility, diffusion coefficient and surface tension
    • 1.6 Appendix II: Effects of bubble on transient wave
    • 1.7 References
  • 2. Experimental methods
    • Abstract:
    • 2.1 Preliminary remarks
    • 2.2 Microscope
    • 2.3 Photography
    • 2.4 Laser beam transmission
    • 2.5 Measurements of physical quantities
    • 2.6 Flows and channels
    • 2.7 Observation of tribonucleation
    • 2.8 References
  • 3. Cavitation inception in separating oil flows
    • Abstract:
    • 3.1 Test channels for observation of cavitation
    • 3.2 Experimental parameters
    • 3.3 Oil flows with separation and reattachment in two-dimensional constriction
    • 3.4 Oil flows separating at a tip of needle projection
    • 3.5 Oil flows separating from smooth surface
    • 3.6 Summary
    • 3.7 References
  • 4. Cavitation inception in separating water flows
    • Abstract:
    • 4.1 Experimental apparatus
    • 4.2 Cavity generation and cavitation in separating water flows
    • 4.3 Pressure dependence of cavity generation
    • 4.4 Choking of water flow in 2-D constriction
    • 4.5 Summary
    • 4.6 References
  • 5. Singular properties of flow separation as a cause of cavitation inception
    • Abstract:
    • 5.1 Tensions at point of flow separation
    • 5.2 Heat generation at point of separation
    • 5.3 PIV inspection of separation flow
    • 5.4 Mechanism of tension and heat generations by flow separation
    • 5.5 Hypothesis of cavity generation mechanism at point of flow separation
    • 5.6 References
  • 6. Tribonucleation by contact motion between solids in liquid
    • Abstract:
    • 6.1 Tribonucleation
    • 6.2 Nucleation by separation of solid walls in liquid
    • 6.3 Nucleation by sliding motion between surfaces contacting in liquid
    • 6.4 Summary
    • 6.5 References
  • 7. Cavity generation by flow separation and solid contact in a hydraulic poppet valve
    • Abstract:
    • 7.1 Preliminary remarks
    • 7.2 Experimental setup
    • 7.3 Cavitation in a poppet valve with fixed clearance
    • 7.4 Cavitation in a poppet valve with variable clearance
    • 7.5 Summary
    • 7.6 Reference
  • Afterword
  • Index

Details

No. of pages:
288
Language:
English
Copyright:
© Woodhead Publishing 2015
Published:
Imprint:
Woodhead Publishing
eBook ISBN:
9781782421764
Hardcover ISBN:
9781782421757

About the Author

Seiichi Washio

Seichi Washio is an emeritus professor of Okayama University, Okayama, Japan.

Affiliations and Expertise

Okayama University, Japan

Ratings and Reviews