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Modelling of Atomization Process in Flash Boiling Spray
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Abstract
This paper presents the analysis of atomization and vaporization processes in a flash boiling spray based on experimental results obtained from injection systems in the suction manifold of a gasoline engine. Two kinds of liquid fuel, n-Pentane and n-Hexane, were injected into quiescent atmosphere at room-temperature and low-pressure through a pintle type injector with electronic control. The spray characteristics of both fuels below various atmospheric pressures were investigated in detail by taking photography. Then, in the region of flash boiling, where the back pressure was below the saturated vapor pressure of fuel, the bubble nucleation process due to the flash boiling was modelled by both the measurement results of bubble and the nucleation rate equation using the degree of superheat of the liquid fuel. Further, the fuel vaporization process was assessed by the bubble growth calculation in vapor cavitation phenomena, the fuel evaporation due to boiling from the liquid film surface and the evaporation process from the film surface owing to heat transfer between the ambient gas and the liquid film. Accordingly, the transient change in the bubble diameter and the vapor mass fraction inside the spray are estimated quantitatively for each back pressure. The calculated results, such as the shape of fuel film jet and the fuel droplet diameter in the spray, agree well with the experimental results.
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Senda, J., Hojyo, Y., and Fujimoto, H., "Modelling of Atomization Process in Flash Boiling Spray," SAE Technical Paper 941925, 1994, https://doi.org/10.4271/941925.Also In
References
- Brown R. York J. L. Spray Formed by Flashing Liquid Jets A. I. Ch. E. J. 8 2 149 153 1962
- Lienhard J. H. James B. D. The Breakup of Superheated Liquid Jets Trans. ASME, J. of Basic Engng. 92 3 515 522 1970
- Sudo H. Iwai N. Tsuruga T. Kim Y. Study of Methanol Engines -Characteristics of Flash Boiling Spray- Trans. JSAE 16 24 29 1978
- Suzuki M. Yamamoto T. Futagami N. Maeda S. Atomization of Superheated Liquid Jet Proc. ICLASS-78 2 2 37 43 August 1978
- Oza R. D. Sinnamon J. F. An Experimental and Analytical Study of Flash-Boiling Fuel Injection SAE Paper, No. 830590
- Senda J. Yamaguchi M. Wakashiro T. Tsukamoto T. Hojyo K. Fujimoto H. Spray Characteristics of Pintle Type Injector under Low-Pressure Field ICLASS-91 96 857 864 1991
- Senda J. Yamaguchi M. Nishikori T. Tsukamoto T. Fujimoto H. Characteristics of Flash Boiling Spray under Low-Pressure Field Proc. Int. Conf. on Multiphase Flows '91-Tsukuba 133 136 1991
- Senda J. Nishikori T. Tsukamoto T. Fujimoto H. Atomization of Spray under Low-Pressure Field from Pintle Type Gasoline Injector SAE Paper, No. 920382
- Sato K. Lee C. Nagai N. Atomization Phenomena of Superheated Liquid Jets Injected from a Single Hole Nozzle Trans. JSME (B) 50 459 2661 2668 1984
- Nakamura K. Someya T. Investigation on the Tensile Strength of Real Liquids Trans. JSME (B) 46 405 910 917 1980
- Suma S. Koizumi M. Internal Boiling Atomization by Rapid Pressure Reduction of Liquids Trans. JSME(B) 43 376 4608 4617 1977
- Cole R. Boiling Phenomena 1 Hemisphere Pub. Washington 83 1979
- Plesset M. S. Cavitation in Real Liquids Amer. Elsevrer Pub. New York 1 1964
- Ida T. Sugiya T. Motion of Air Bubbles in Mineral Oils Subject to Sudden Change in Chamber Pressure (1st. Report, Experimental Analysis for Single bubbles) Trans. JSME (B) 45 399 1650 1657 1979
- Scriven L. E. Dynamics of A Fluid Interface Chem. Engng. Science 12 2 98 108 1960
- Cole R. Boiling Phenomena 1 Hemisphere Pub. Washington 324 1979
- Kobayashi K. A Study on The Evaporation and Combustion of A Single Droplet (2nd. Report: Evaporation Velocity) Trans. JSME 20 100 833 837 1954
- Henley J. J. Hummel R. L. Ind. Eng. Chem. Fundamentals 6 603 1967