고압에서의 액적의 증발현상에 관한 연구
Investigation of Droplet Vaporizatio Phenomena in High Pressure Environments
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초록
The spray combustion and spray cooling depends on droplet evaporation. So, evaporation model for spray has been requested and lots of investigation has been done and various reliable models have been developed also for last few decades. In the present study, One dimensional quasi-steady spherically symmetric droplet evaporation model for micro-gravity is developed. The gas phase was assumed as steady state and the thermophysical properties are calculated as a function of temperature, pressure and composition and the properties used in the model was validated by NIST web data and overall evaporation history results was compared with experimental results by Nomura and Qasim and gave satisfactory agreements. Through this model, diverse phenomenon was investigated, especially regarding the effects of ambient pressure and temperature. The effects of pressure for the droplet evaporation time were studied. The high pressure increased the droplet surface temperature and made effect on the evaporation time depend on atmospheric temperature. The role of the ambient temperature was investigated and explained. The basic investigation for the evaporation process according to variation of droplet diameter and surface temperature were also investigated and the well-known phenomena, like D-square-law, were reported, too.
Abstract
The spray combustion and spray cooling depends on droplet evaporation. So, evaporation model for spray has been requested and lots of investigation has been done and various reliable models have been developed also for last few decades. In the present study, One dimensional quasi-steady spherically symmetric droplet evaporation model for micro-gravity is developed. The gas phase was assumed as steady state and the thermophysical properties are calculated as a function of temperature, pressure and composition and the properties used in the model was validated by NIST web data and overall evaporation history results was compared with experimental results by Nomura and Qasim and gave satisfactory agreements. Through this model, diverse phenomenon was investigated, especially regarding the effects of ambient pressure and temperature. The effects of pressure for the droplet evaporation time were studied. The high pressure increased the droplet surface temperature and made effect on the evaporation time depend on atmospheric temperature. The role of the ambient temperature was investigated and explained. The basic investigation for the evaporation process according to variation of droplet diameter and surface temperature were also investigated and the well-known phenomena, like D-square-law, were reported, too.
참고문헌 (11)
- Zhu, G. S., "Transient Supercritical Droplet Evaporation with Emphasis on the Effects of Equation of State", International Journal of Heat and Mass Transfer, 43(7), pp.1157~1171 (2000)
- Yan, C., "A High-Pressure Droplet Model for Spray Simulations", Journal of Engineering for Gas Turbines and Power, 128(3), pp.482~492 (2006)
- Jia, H., "High Pressure Droplet Vaporization; Effects of Liquid-Phase Gas Solubility", International Journal of Heat and Mass Transfer, 36(18), pp.4419~4431 (1993)
- Nomura, Hiroshi, "Experimental study on high-pressure droplet evaporation using microgravity conditions", Twenty-Sixth Symposium (International) on Combustion, pp.1267~1273 (1996)
- H.Ghassemmi, "Experimental Study on Binary Droplet Evaporation at Elevated pressure and Temperature", Combustion Science and Technology, 9, pp.1669~1684 (2006)
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- Peng, D., "A new two-constant equation of state", Industrial and Engineering Chemistry Fundamentals, 15(1), pp.59~64 (1976)
- Reid, R. C., "the Properties of Gases and Liquids (4th Edn)" (1987), McGraw-Hill
- Oxtoby, "현대일반화학 제5판" (2003), 자유아카데미
- 강상훈, "고압에서의 액적의 증발 및 연소현상에 관한 연구", 석사, pp.2000
- T.E.Daubert, "Physical and Thermodynamic Properties of Pure Chemicals" (1988), Hemisphere Publishing Corporation