Modeling on atomization and vaporization process in flash boiling spray |
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| Institution: | 1. Department of Mechanical Engineering, Doshisha University, Kyoto, 610-03 Japan;2. Graduate School, Doshisha University, Kyoto, 610-03 Japan;1. University of Melbourne, Department of Mechanical Engineering, Building 170, Grattan St., Parkville, VIC 3010, Australia;2. RMIT University, Department of Media and Communication, 124 La Trobe St., Melbourne, VIC 3000, Australia;3. Ford Motor Company of Australia, Norlane, VIC 3214, Australia;1. School of Mechanical Engineering, Shanghai Jiao Tong University, National Engineering Laboratory of Electronic Control Technology, Shanghai 200240, China;2. University of Michigan–SJTU Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China;1. School of Mechanical Engineering, Shanghai Jiao Tong University, National Engineering Laboratory of Electronic Control Technology, Shanghai 200240, China;2. University of Michigan – SJTU Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China;1. Advanced System Engineering, Continental Automotive France, Toulouse, France;2. Department of Mechanical Engineering, Capital University of Science and Technology, Islamabad, Pakistan;3. Laboratoire de Mécanique des Fluides et d’Acoustique, CNRS – Ecole Centrale de Lyon INSA Université Claude Bernard Lyon, Ecully, France |
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| Abstract: | This paper presents the model analysis on atomization and vaporization processes in a flash boiling spray based on experimental results obtained from an injection system in the suction manifold of a gasoline engine. Two kinds of liquid fuel, n-Pentane and n-Hexane, are injected into quiescent gaseous atmosphere at room-temperature with low pressure through a pintle type injector. Fuel spray is observed, by taking photographs, with variation of the ambient back pressure. Then, in the flash boiling spray region where the back pressure was below the saturated vapor pressure of fuel, the bubble nucleation process due to flash boiling was modeled by both experimental results and the nucleation rate equation as a parameter of the pressure difference between back pressure and vapor pressure. Further, the fuel vaporization process was assessed by considering growth calculation of cavitation bubbles and fuel evaporation from the film surface due to heat transfer at the gas-liquid interface. Accordingly, we could estimate quantitatively the transient changes in the bubble growth and the vapor mass fraction inside the spray for each back pressure condition. |
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