NICOP - Viscous Dissipation and Heating from Cavitation Bubbles
Abstract
Viscous Dissipation and Heating from Cavitation Bubbles:Technical: Cavitation erosion of polymer coating on propeller is not well understood, especially the erosion due to melting of the coating. The Nanyang Technological University has unique testing facility and expertise in measuring shear stress and associated heat generation due to cavitation bubble explosion. The proposed effort is to study experimentally the heating of polymer-coated surfaces from cavitation bubble dynamics and focus on the following two aspects: (1) recording of the bubble dynamics, pressure emission, and flow field from one and two bubbles between 0.2 and 0.5mm in radius near the compliant surface and (2) measurement of the time-resolved temperature field at the surface during bubble collapse. For all experiments one and two cavitation bubbles are generated with two pulsed lasers. The temperature field is measured through total internal reflection and the intensity from a temperature dependent fluorophore. We will use evanescent wave illumination to ensure the measurement in the liquid domain only. b. Relevance: The proposed state-of-the-art research directly supports the Platform Design and Survivability S&T focus areas. The effort is related to ONR~s cavitation research program, in particular to the research of erosion phenomena of polymer coatings. The experimental work allows to pinpoint the moment and condition of heating during the collapse of a cavitation bubble. Prof. Ali Amirkhizi (U. Massachusetts in Lowell) will provide samples of the polymer coating on suitable substrates and thicknesses. The experimental results will be distributed to ONR partners conducting simulations, in particular to Prof. Eric Johnsen (U. Michigan) and Dr. Georges Chahine (Dynaflow). c. Coordination: Dr. Ki-Han Kim (ONR Code 331) d. Desired Outcome: The expected outcomes include: (1) enhanced understanding of the effects of heating on material deformation and failure of polymeric coatings during the cavitation bubble collapse, (2) a database containing the flow fields and bubble dynamics for different parameters together with the measurement of the surface heating, and (3) one to two refereed journal papers, and presented at an international conference and two ONR Annual Program Review meetings
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 30, 2016
- Source ID
- N629091612139
Entities
People
- Claus-dieter Ohl
Organizations
- Nanyang Technological University
- Office of Naval Research
- United States Navy