Static droplet phase transformation model for variable pressure conditions

doi:10.16511/j.cnki.qhdxxb.2016.21.041

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Abstract The steam-water separator is a very important part of steam generators. The steam separator removes small droplets carried by the vapor stream to provide saturated vapor to the steam turbine. The steam-water separator performance then greatly impacts the safety and economy of the nuclear power station. As droplets move through the separator, the pressure decreases due to the flow resistance and structure variation, which may break the liquid-vapor equilibrium, cause the droplets to evaporate and influence the steam-water separator performance. This paper gives a hydrodynamic-kinetic model of static droplet phase transformations when the pressure varies based on physical and mechanist models of droplet evaporation. The model predictions are independent of the time step and the results agree well with existing data with relative errors less than ±5%. This model provides a theoretical reference for further studies of droplet phase transformations to improve the separation performance of steam separators.

Keywords steam-water separation droplet evaporation pressure variation hydrodynamic-kinetic model

ZTFLH:	O359.1
	TK124

Issue Date: 15 July 2016

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	ZHAO Fulong
	BO Hanliang
	LIU Qianfeng

Cite this article:

ZHAO Fulong,BO Hanliang,LIU Qianfeng. Static droplet phase transformation model for variable pressure conditions[J]. Journal of Tsinghua University(Science and Technology), 2016, 56(7): 759-764,771.

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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2016.21.041 OR http://jst.tsinghuajournals.com/EN/Y2016/V56/I7/759

[1] 李嘉, 黄素逸, 王晓墨. 波形板汽-水分离器分离效率的实验研究[J]. 核动力工程, 2007, 28(3):94-97, 124.LI Jia, HUANG Suyi, WANG Xiaomo. Experimental research of separation efficiency on steam-water separator with corrugated plates[J]. Nuclear Power Engineering, 2007, 28(3):94-97, 124. (in Chinese)
[2] Kataoka H, Shinkai Y, Hosokawa S, et al. Swirling annular flow in a steam separator[J]. Journal of Engineering for Gas Turbines and Power, 2009, 131(3), 32904.
[3] Nakao T, Nagase M, Aoyama G, et al. Development of simplified wave-type vane in BWR steam dryer and assessment of vane droplet removal characteristics[J]. Journal of Nuclear Science and Technology, 1999, 36(5):424-432.
[4] Li J, Huang S, Wang X. Numerical study of steam-water separators with wave-type vanes[J]. Chinese Journal of Chemical Engineering, 2007, 15(4):492-498.
[5] Eck M, Schmidt H, Eickhoff M, et al. Field test of water-steam separators for direct steam generation in parabolic troughs[J]. Journal of Solar Energy Engineering, 2008, 130(1):0110021-0110026.
[6] Erbil H Y. Evaporation of pure liquid sessile and spherical suspended drops:A review[J]. Advances in Colloid and Interface Science, 2012, 170(1):67-86.
[7] 马超. 自由液面单气泡破裂产生膜液滴现象实验与理论研究[D]. 北京:清华大学, 2014.MA Chao. The Experimental and Theoretical Research about the Phenomenon of the Film Drops Produced by Bubble Bursting at a Free Water Surface[D]. Beijing:Tsinghua University, 2014. (in Chinese)
[8] 张谨奕. 三维流场中单液滴运动模型和应用研究[D]. 北京:清华大学, 2012.ZHANG Jinyi. Study of Single Droplet Motion Model and Application in Three-Dimensional Flow Field[D]. Beijing:Tsinghua University, 2012. (in Chinese)
[9] 张璜. 多液滴运动和碰撞模型研究[D]. 北京:清华大学, 2015. ZHANG Huang. Motion and Collision Models of Polydispersed Droplets[D]. Beijing:Tsinghua University, 2015. (in Chinese)
[10] 崔成松, 蒋祖龄, 沈军, 等. 雾化过程气体与金属雾滴的三维流动模型[J]. 金属学报, 1994, 30(19):294-300.CUI Chengsong, JIANG Zuling, SHEN Jun, et al. Modelling of three-dimensional flow of atomizing gas and droplets in atomization process[J]. Acta Metallurgica Sinica, 1994, 30(19):294-300. (in Chinese)
[11] Lewis E R. The effect of surface tension (Kelvin effect) on the equilibrium radius of a hygroscopic aqueous aerosol particle[J]. Journal of Aerosol Science, 2006, 37(11):1605-1617.
[12] 徐旭常, 毛健雄, 曹瑞良, 等. 燃烧理论与燃烧设备[M]. 北京:机械工业出版社, 1990:142-150.XU Xuchang, MAO Jianxiong, CAO Ruiliang, et al. Combustion Theory and Combustion Equipment[M]. Beijing:Machinery Industry Press, 1990:142-150. (in Chinese)
[13] Liu L, Bi Q, Liu W, et al. Experimental and theoretical investigation on rapid evaporation of ethanol droplets and kerosene droplets during depressurization[J]. Microgravity Science and Technology, 2011, 23(1):89-97.
[14] 张兆顺, 崔桂香. 流体力学[M]. 北京:清华大学出版社, 2006:229-240.ZHANG Zhaoshun, CUI Guixiang. Fluid dynamics[M]. Beijing:Tsinghua University press, 2006:229-240. (in Chinese)
[15] Zhang T. Study on Surface Tension and Evaporation Rate of Human Saliva, Saline, and Water Droplets[D]. Charlottesville:West Virginia University, 2011.
[16] 波林, 普劳斯尼茨, 奥康奈尔, 等. 气液物性估算手册[M]. 北京:化学工业出版社, 2006:448-472.Poling B E, Prausnitz J M, O'connell J P, et al. The Properties of Gases and Liquids[M]. Beijing:Chemical Industry Press, 2006:448-472. (in Chinese)
[17] Kryukov A P, Levashov V Y, Sazhin S S. Evaporation of diesel fuel droplets:kinetic versus hydrodynamic models[J].International Journal of Heat and Mass Transfer, 2004,47(12):2541-2549.
[18] Marek R, Straub J. Analysis of the evaporation coefficient and the condensation coefficient of water[J].International Journal of Heat and Mass Transfer, 2001,44(1):39-53.
[19] Kristyadi T, Deprédurand V, Castanet G, et al. Monodisperse monocomponent fuel droplet heating and evaporation[J].Fuel, 2010,89(12):3995-4001.
[20] 赵凯璇, 赵建福, 陈淑玲, 等. 液滴真空闪蒸/冻结过程的热动力学研究[J]. 空间科学学报, 2011,31(1):57-62. ZHAO Kaixuan, ZHAO Jianfu, CHEN Shuling, et al. Thermodynamics of flashing/freezing process of a droplet in vacuum[J].Chinese Journal of Space Science, 2011,31(1):57-62. (in Chinese)