| Cavitation, the study of formation, growth, and collapse of cavities, in the coolant jacket adjacent to diesel engine cylinder liners is an area of concern for the transportation industry. Prior experimental work provides insight into parameters that affect liner cavitation, but such work is costly and time consuming. A commonly used 200 hour engine coolant test in the industry can cost around {dollar}35,000 to {dollar}40,000. Therefore, use of mathematical models for sorting out coolants is proposed to be a quick, handy and cost effective tool. The present work is divided into two main parts as a study of a bubble in an infinite medium, and a study of a bubble near a rigid wall.; With the assumption of a bubble remaining spherical at all time in an infinite medium, Rayleigh-Plesset (RP) dynamics is used to quantify the potential for cavitation damage by calculating 'bubble wall velocity' at the time of collapse. The study of bubble behavior near a rigid wall is one step closer to the analysis of liner wall pitting. A model calculating 'jet velocity' at the time of bubble collapse near a finite plate is determined using a commercial boundary element code, 2DynaFS. Testing of the models is achieved by comparing effects of typical coolants such as 100% water, 40, 50, and 60% mixtures of ethylene glycol with water and 40, 50, and 60% mixtures of propylene glycol with water. Potential of cavitation damage correlated to jet velocity showed good agreement with published experimental results.; The need of refinement of boundary element mesh resulted in the development of a particular Green's function for an axisymmetric void of arbitrary shape located between two parallel walls. Numerical results are given to demonstrate the accuracy in the Green's function formulation by comparison with numerical solutions obtained using a commercial finite element code. The present formulation is attractive since numerical implementation only involves unknowns on the surface of the void. |
