Stretching of turbulent eddies generates cavitation near a stagnation point

作者：Lu Yuan; Gopalan Balaji; Celik Emine; Katz Joseph^*; Van Wie David M

来源：Physics of Fluids, 2010, 22(4): 041702.

DOI：10.1063/1.3407661

• bubbles
• cavitation
• flow visualisation
• jets
• stagnation flow
• turbulence

Cavitation inherently occurs in regions with low pressure. However, in recent experiments involving a high-speed bubbly jet impinging on a blunt body, we have observed rapid growth and stretching of bubbles near the stagnation point. The analysis of holographic particle image velocimetry data shows that turbulent eddies which originated from the jet are being stretched by the strain field in the vicinity of the stagnation point to form powerful vortices. Their strength and size along with the local strain rate are sufficient for decreasing the pressure in the vortex core below the vapor pressure, explaining the occurrence of cavitation in this region.

• 出版日期2010-4