The acoustics of cavitation in spool valve with U-notches

Spiral cavity produced by the swirling flow is observed in spool valve with U-notches. Individual bubbles with similar grown-up size appear in the wake of the fixed cavity. Consecutive bubble collapse produces frequency peak in the spectra, which decreases with the cavitation number. Vortex shedding occurs by the ‘break-off’ of the tail of the spiral cavity, the collapse of which affects significantly to those accompanied individual bubbles dynamics and acoustics. Rayleigh prediction to the bubble collapse time is taken, which is a bit smaller than the experimental result. The considerable viscidity effect of the oil medium is assumed as the predominant reason.

[1]  R. Mesler,et al.  A Photographic Study of the Dynamics and Damage Capabilities of Bubbles Collapsing Near Solid Boundaries , 1965 .

[2]  Yasuhiro Saito,et al.  Unstable Cavitation Behavior in a Circular-Cylindrical Orifice Flow , 2002 .

[3]  Donald Roe Ross,et al.  Mechanics of underwater noise , 1976 .

[4]  Keiichi Sato,et al.  Bubble Collapse Propagation and Pressure Wave at Periodic Cloud Cavitation , 2007 .

[5]  A. T. Ellis,et al.  On the Mechanism of Cavitation Damage by Nonhemispherical Cavities Collapsing in Contact With a Solid Boundary , 1961 .

[6]  Masato Ida.  Bubble-bubble interaction: a potential source of cavitation noise. , 2009, Physical review. E, Statistical, nonlinear, and soft matter physics.

[7]  J. Kiesbauer.  Control valves for critical applications , 2001 .

[8]  Luca d'Agostino,et al.  On the Acoustical Dynamics of Bubble Clouds , 1983 .

[9]  C. Brennen.  Cavitation and Bubble Dynamics , 1995 .

[10]  L. Rayleigh.  VIII. On the pressure developed in a liquid during the collapse of a spherical cavity , 1917 .

[11]  Christopher E. Brennen,et al.  Observations of the dynamics and acoustics of travelling bubble cavitation , 1991, Journal of Fluid Mechanics.

[12]  M. Plesset.  The Dynamics of Cavitation Bubbles , 1949 .

[13]  C. Brennen,et al.  Shock Waves and Noise in the Collapse of a Cloud of Cavitation Bubbles , 1995 .

[14]  Timo Koivula,et al.  ON CAVITATION IN FLUID POWER , 2000 .

[15]  Jun Zou,et al.  Cavitating flow in non-circular opening spool valves with U-grooves , 2009 .

[16]  D. Hsieh.  On the Dynamics of Nonspherical Bubbles , 1972 .

[17]  F. Gilmore,et al.  The growth or collapse of a spherical bubble in a viscous compressible liquid , 1952 .

[18]  Robert H. Mellen,et al.  Ultrasonic Spectrum of Cavitation Noise in Water , 1954 .

[19]  Milton S. Plesset,et al.  Collapse of an initially spherical vapour cavity in the neighbourhood of a solid boundary , 1971, Journal of Fluid Mechanics.

[20]  Leon Trilling,et al.  The Collapse and Rebound of a Gas Bubble , 1952 .