Luminescence intensity of vortex cavitation in a Venturi tube changing with cavitation number
| Autor: | Hitoshi Soyama |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Luminescence Acoustics and Ultrasonics Vapor pressure Sound velocity lcsh:QC221-246 02 engineering and technology 010402 general chemistry 01 natural sciences Inorganic Chemistry lcsh:Chemistry Pressure Chemical Engineering (miscellaneous) Environmental Chemistry Radiology Nuclear Medicine and imaging Original Research Article ComputingMethodologies_COMPUTERGRAPHICS Hydrodynamic cavitation Organic Chemistry Mechanics 021001 nanoscience & nanotechnology Flow field 0104 chemical sciences Vortex Upstream pressure lcsh:QD1-999 Cavitation Venturi effect lcsh:Acoustics. Sound 0210 nano-technology Intensity (heat transfer) |
| Zdroj: | Ultrasonics Sonochemistry, Vol 71, Iss, Pp 105389-(2021) Ultrasonics Sonochemistry |
| ISSN: | 1350-4177 |
| Popis: | Graphical abstract Highlights • Vortex cavitation is important phenomenon in luminescence of hydrodynamic cavitation. • Pressure wave induced by collapse of vortex cavitation is visualized. • Sound velocity in cavitating flow field is evaluated by observing the pressure wave. • The sound velocity is key factor of luminescence intensity. • Luminescence intensity is enhanced by optimizing pressure where bubble collapse. Hydrodynamic cavitation in a Venturi tube produces luminescence, and the luminescence intensity reaches a maximum at a certain cavitation number, which is defined by upstream pressure, downstream pressure, and vapor pressure. The luminescence intensity of hydrodynamic cavitation can be enhanced by optimizing the downstream pressure at a constant upstream pressure condition. However, the reason why the luminescence intensity increases and then decreases with an increase in the downstream pressure remains unclear. In the present study, to clarify the mechanism of the change in the luminescence intensity with cavitation number, the luminescence produced by the hydrodynamic cavitation in a Venturi tube was measured, and the hydrodynamic cavitation was precisely observed using high-speed photography. The sound velocity in the cavitating flow field, which affects the aggressive intensity of the cavitation, was evaluated. The collapse of vortex cavitation was found to be closely related to the luminescence intensity of the hydrodynamic cavitation. A method to estimate the luminescence intensity of the hydrodynamic cavitation considering the sound velocity was developed, and it was demonstrated that the estimated luminescence intensity agrees well with the measured luminescence intensity. |
| Databáze: | OpenAIRE |
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