Abstract
Cavitation phenomena occuring in converging-diverging nozzle (Venturi tube) are described in the paper. A closed test circuit with possibility to control both flow rate and pressure level were used. Loss coefficient was evaluated for different sigma numbers resulting in full static characterization of the nozzle. Visualizations of the cavitation pattern development were acquired and matched with evolution of the loss coefficient. Three cavitation regimes are described: partial cavitation, fully developed cavitation, supercavitation.
Highlights
Cavitation occurs in liquids when the local value of the absolute pressure reaches so called saturated vapor pressure
Appearance and structure of the cavitation strongly depends on hydrodynamic characteristics of the flow and geometry of the flow domain
- blockage due to cavitation significantly increases hydraulic losses. This increase is uniform from the cavitation inception up to supercavitating regime
Summary
Cavitation occurs in liquids when the local value of the absolute pressure reaches so called saturated vapor pressure. Supercavitation phenomenon is mostly studied for case of external hydrodynamics when the vapor filled bubble closes behind the body subjected to fast flowing liquid stream. Converging-diverging nozzle has become a popular testcase for development of cavitation models included in CFD softwares [4,5,6] or for visualization of cavitation patterns by non-intrusive techniques [7, 8]. These experiments are based on asymmetric planar CD nozzle with rectangular cross-section. Present paper is directed toward CD nozzle with circular cross-section, which is more common in pipeline systems
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