Seminar Details

Cavitation and supercavitation

Date

14/05/2015

Lecturers

Dr. Alon Gany - Faculty of Aerospace Engineering, Technion

Abstract

The talk will discuss the cavitation and supercavitation phenomena. Cavitation refers to the formation of vapor bubbles (“cavities”) resulting from the existence of local low pressures (below the vapor pressure) over a body moving in liquid (usually water). It often happens in propellers and pumps, causing damage to the surfaces when the bubbles collapse. Elaboration on cavitation phenomena in mechanical devices as well as in marine animals (dolphins, sharks) will be made. A special aspect of cavitation is supercavitation, where elongated cavitation bubble is formed, covering the entire body during its underwater motion. It causes dramatic reduction of the drag, enabling movement at speeds of hundreds km per hour. This phenomenon has been used for the development of the ultra-fast torpedo Shkval.

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