Recent Developments in Cavitation Mechanisms 1st Edition by Seichi Washio ISBN 1782421769 9781782421764

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ISBN 10: 1782421769 
ISBN 13: 9781782421764
Author: Seichi Washio

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.

Recent Developments in Cavitation Mechanisms 1st Table of contents:

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

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Tags: Seichi Washio, Cavitation Mechanisms