Cavitation onset caused by acceleration.

Autor:	Pan Z; Department of Mechanical and Aerospace Engineering, Utah State University, Logan, UT 84322., Kiyama A; Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, 184-8588 Tokyo, Japan., Tagawa Y; Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, 184-8588 Tokyo, Japan; tagawayo@cc.tuat.ac.jp taddtruscott@gmail.com., Daily DJ; Naval Undersea Warfare Center, Newport, RI 02841., Thomson SL; Department of Mechanical Engineering, Brigham Young University, Provo, UT 84602., Hurd R; Department of Mechanical and Aerospace Engineering, Utah State University, Logan, UT 84322., Truscott TT; Department of Mechanical and Aerospace Engineering, Utah State University, Logan, UT 84322; tagawayo@cc.tuat.ac.jp taddtruscott@gmail.com.
Jazyk:	angličtina
Zdroj:	Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2017 Aug 08; Vol. 114 (32), pp. 8470-8474. Date of Electronic Publication: 2017 Jul 24.
DOI:	10.1073/pnas.1702502114
Abstrakt:	Striking the top of a liquid-filled bottle can shatter the bottom. An intuitive interpretation of this event might label an impulsive force as the culprit in this fracturing phenomenon. However, high-speed photography reveals the formation and collapse of tiny bubbles near the bottom before fracture. This observation indicates that the damaging phenomenon of cavitation is at fault. Cavitation is well known for causing damage in various applications including pipes and ship propellers, making accurate prediction of cavitation onset vital in several industries. However, the conventional cavitation number as a function of velocity incorrectly predicts the cavitation onset caused by acceleration. This unexplained discrepancy leads to the derivation of an alternative dimensionless term from the equation of motion, predicting cavitation as a function of acceleration and fluid depth rather than velocity. Two independent research groups in different countries have tested this theory; separate series of experiments confirm that an alternative cavitation number, presented in this paper, defines the universal criteria for the onset of acceleration-induced cavitation. Competing Interests: The authors declare no conflict of interest.
Databáze:	MEDLINE
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