Quality Waterjet Newsletter 04/08/2008

Effect of Temperature on Cavitating Jet


Oike and Kobayashi* presented an experiment study on the effect of water temperature on cavitating jets. Here are the highlights of their article.


First of all, their experiments confirmed a known effect of stand-off distance on erosion (as shown to the right). There are two peak erosion points that occurred when the ratios of stand-off distance to nozzle diameter (s/d) are 15X and 55X. The first peak is associated with the erosion pit at the center of impact while the second peak is associated with the outer ring (as shown in the photo).


To study the effect of temperature on erosion, they used 4 sets of injection/surrounding water temperatures, (20ºC, 20ºC), (20ºC, 50ºC), (50ºC, 20ºC), (50ºC, 50ºC), in their experiments. When s/d=15, the higher injection water temperature increased the mass loss by about 3X, regardless surrounding water temperature. When s/d=55, the higher temperatures in both injection and surrounding water increased the mass loss by about 4X. The authors believed that the higher injection water temperature promotes the occurrence of cavitation bubbles in the jet and thus the erosion power. They also believed that increasing both the injection and surrounding temperatures promotes the occurrence of bubbles in the cavitation cloud surrounding the jet.


* Oike, M. and Kobayashi, R. (2006) Influence of water temperatures on cavitating jet, Proceedings of the 8th Pacific Rim International Conference on Water Jet Technology, Oct. 10-12, Qingdao, China, Paper 7.



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