NICOP -MEASUREMENTS AND COMPUTATIONS OF THE TEMPERATURE VARIATIONS DURING THE COLLAPSE OF CAVITATION BUBBLES
Abstract
MEASUREMENTS AND COMPUTATIONS OF THE TEMPERATURE VARIATIONS DURING THE COLLAPSE OF CAVITATION BUBBLES:. Technical: Material erosion due to collapse of vapor bubbles is a major limitation in the lifetime of rotating machinery operating in cavitating conditions. Erosion is believed to be result of the extreme conditions that occur during the collapse of the vapor bubbles. Historically it was attributed to shock waves and micro-jets generated by the collapse of bubbles. Recent studies now suggest that generation of very short-lived local hot spots resulting from the bubble collapse certainly plays a role in the erosion mechanism. On the other hand, these very local hot spots can be used to positively influence a variety of chemical, physical, and biological processes. Precise measurements of these local temperature peaks, and thus a more thorough quantitative characterization of thermodynamic aspects of cavitating flows, are yet to be performed. This NICOP proposal presents a novel method for measuring fine-scale temperature fields in a cavitating flow and development of a space and time averaged temperature variation model for analysis of macro-scale features of such flows. b. Relevance: NICOP is in response to N00014-16-R-BA001and will assist understanding of the physics of flow around propulsors and their interactions to improve propulsor design capability that would result in improved mobility, efficiency, and affordability.c. ONR Code 33 (Ki-Han Kim) is the lead for this proposal.d. Desired Outcome(s): Predictive capability of cavitation effects on marine propulsors and appendages.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 23, 2016
- Source ID
- N629091612116
Entities
People
- Olivier Coutier-delgosha
Organizations
- Office of Naval Research
- United States Navy