Dynamics of the cavitating flow downstream of the orifice plate

Orifices with varying number of holes, but with the same flow cross-sections were tested in a cavitation circuit. Static characteristics, in term of loss coefficients, were measured in a range of non-cavitating and cavitating regimes. Since cavitating flow has very rich dynamics attention was also paid to spectral properties, especially in the cavitating regime. Data evaluated from several pressure transducers placed downstream of the orifice and for different orifice types are presented and discussed. Marked differences in both static and dynamic characteristics are observed between single-hole and multi-hole orifices.Orifices with varying number of holes, but with the same flow cross-sections were tested in a cavitation circuit. Static characteristics, in term of loss coefficients, were measured in a range of non-cavitating and cavitating regimes. Since cavitating flow has very rich dynamics attention was also paid to spectral properties, especially in the cavitating regime. Data evaluated from several pressure transducers placed downstream of the orifice and for different orifice types are presented and discussed. Marked differences in both static and dynamic characteristics are observed between single-hole and multi-hole orifices.

[1]  S. Dash,et al.  Single-Phase and Two-Phase Flow Through Thin and Thick Orifices in Horizontal Pipes , 2012 .

[2]  Parag R. Gogate,et al.  A review of applications of cavitation in biochemical engineering/biotechnology , 2009 .

[3]  S. Harrison,et al.  Disruption of Brewers' yeast by hydrodynamic cavitation: Process variables and their influence on selective release , 2006, Biotechnology and bioengineering.

[4]  Rex B. Thorpe,et al.  Flow regime transitions due to cavitation in the flow through an orifice , 1990 .

[5]  Hedi Hassis,et al.  NOISE CAUSED BY CAVITATING BUTTERFLY AND MONOVAR VALVES , 1999 .

[6]  F. Pochylý,et al.  Experimental investigation of hydrodynamic cavitation through orifices of different geometries , 2017 .

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

[8]  Selective method for cyanobacterial bloom removal: hydraulic jet cavitation experience , 2014, Aquaculture International.

[9]  B. Širok,et al.  Removal of pharmaceuticals from wastewater by biological processes, hydrodynamic cavitation and UV treatment. , 2013, Ultrasonics sonochemistry.

[10]  Milada Kozubková,et al.  Diagnostics of Resistance Coefficients and Cavitation of Flow Control Valve , 2015 .

[11]  Martin Hudec,et al.  Characterization of the cavitating flow in converging-diverging nozzle based on experimental investigations , 2014 .

[12]  Martin Hudec,et al.  EXPERIMENTAL MEASUREMENT AND NUMERICAL MODELING OF CAVITATING FLOW IN CONVERGING-DIVERGING NOZZLE , 2012 .

[13]  A Avraham Hirschberg,et al.  Noise generated by cavitating single-hole and multi-hole orifices in a water pipe , 2007 .