Tzanakis, I. and Hadfield, M., 2010. Observations of acoustically generated cavitation bubbles within typical fluids applied to a scroll expander lubrication system. Journal of Hydrodynamics. (Submitted)
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An experimental study using an ultrasonic transducer, submerged into the fluids (water-lubricant-refrigerant), is utilised to produce cavitation bubbles. Images are focused on two critical areas: the lower surface of the horn and across the boundary of the sample. The sample consists of a chromium ball mounted on a Bakelite base and implemented on the bottom of the experimental tank. The results revealed that the lubricant bubbles have a similar behaviour to those produced in water. Refrigerant bubbles have a peculiar performance, especially across the boundary wall where they sustain a continuous oscillatory movement without regularly collapsing. The damage produced by the refrigerant bubbles is smaller than that observed within water and oil lubricant. On the contrary, lubricant bubbles exert a much higher micro-jet impact pressure. A lubrication thickness layer developed across the boundary is observed to provide a cushion, absorbing the jet impact during the implosion of a bubble. Thus the micro-jet impact pressure can significantly be decreased. A thorough investigation of the dynamic behaviour of the bubbles and their cavitation mechanisms is conducted using each of the three liquids respectively.
|Uncontrolled Keywords:||Cavitation, Bubble, Refrigerant, Lubricant, Water, Camera, Jet Impact, Scroll|
|Subjects:||Technology > Engineering > General Engineering|
|Group:||School of Design, Engineering & Computing > Sustainable Design Research Centre|
|Deposited By:||Professor Mark Hadfield|
|Deposited On:||22 Oct 2009 17:44|
|Last Modified:||07 Mar 2013 15:16|
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