Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

Basic cavitating flow experiment

In the framework of the PREVERO project, LFDT was in charge of providing experimental and theoretical support for the physical analysis and modeling of cavitation process in a confined geometry. The goal was achieved by slowing down the cavitation process and expanding the bubbles in a specially designed vacuum chamber in order to be able to obtain experimental data on meso- (bubble clouds) as well as on micro-scale (single bubbles).

The experimental results showed strong evolutionary characteristics of cavitating water flow which served for implementation of FIRE code which is now capable to cope with multiscale nature of cavitation process. Two principle experiments were carried out to study cavitation in a confined geometry similar to valve cavitation. The first one has been designed to study a single bubble induced cavitation, while the second experiment enabled to study massive cavitation in the slot region.

Here, the following flow regimes were observed and analysed in terms of structural function, void fraction and bubble number density: so called detachment region where bubble breakup was observed in case of gas cavitation, large scale cavitation region where macroscopic bubbles formed clusters and bubble collapse region where individual bubbles collapsed due to the subcooled conditions. The experimental data served also as a benchmark validation of bulk liquid turbulence CFD model.

Informazioni correlate

Reported by

University of Ljubljana
Askerceva 6
1000 Ljubljana
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