全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

高压环境下垂直管内汽液两相逆流过程数值研究

, PP. 69-74

Keywords: 两相流,淹没,流向反转,流体体积,数值分析

Full-Text   Cite this paper   Add to My Lib

Abstract:

采用流体体积(volumeoffluid,VOF)模型,对0.1、2.03、5.07、10.13MPa环境压力下垂直管内水蒸汽–水逆向流动过程进行数值模拟。研究垂直管内汽液两相逆流流动过程中,环境压力对淹没开始点、全部携带点、流向反转点及淹没消失点的影响。提出了淹没开始点与淹没消失点对应的无量纲汽速、液速间的经验关系式。常压环境下淹没开始点对应的无量纲汽速、液速呈线性分布,但在高压环境下呈二次函数分布,且分布方式与环境压力无关。与常压环境相同,高压环境下的淹没消失也存在滞后现象,且滞后现象的发生范围随环境压力的增大而扩大。有滞后现象的淹没消失点对应的无量纲汽速、液速呈线性关系,直线斜率随压力的升高而增大。高压环境下全部携带点和流向反转点对应的无量纲汽速,均随环境压力的增大而降低,两者均不受液速变化的影响,流向反转点受环境压力的影响相对较小。相同压力条件下,流向反转点所需的汽速低于全部携带点。根据汽液两相流动特性,分析了发生以上现象的原因。

References

[1]  彭云康.回流流动极限实验研究综述[J].核动力工程,1993,14(6):556-559.Peng Yunkang.A summarization of countercurrent flow limitation experiment stuidies[J].Nuclear Power Engineering,1993,14(6):556-559(in Chinese).
[2]  阎昌琪.气液两相流[M].哈尔滨:哈尔滨工程大学出版社,2007:37-39.Yan Changqi.Gas-liquid two phase flow[M].Harbin:Harbin Engineering University Press,2007:37-39(in Chinese).
[3]  Wallis G B,Dobson J E.The onset of slugging in horizontal stratified airwater flow[J].Multiphase Flow,1973,1(1):173-193.
[4]  Shoukri M,Abdul-Razzak A,Yan C Q.Hysteresis effects in countercurrent gas-liquid flow limitations in a vertical tube[J].The Canadian Journal of Chemical Engineering,1994,72(4):576–581.
[5]  阎昌琪,孙中宁.竖直管内两相流逆向流动特性研究[J].核动力工程,2001,22(1):15-18.Yan Changqi,Sun Zhongning.Investigation on countercurrent flow characteristics in vertical tubes [J].Nuclear Power Engineering.2001,22(1):15-18(in Chinese).
[6]  Shearer C J,Davidson J F.The investigation of a standing wave due to gas blowing upwards over a liquid film;its relation to flooding in wetted-wall columns[J].Journal of Fluid Mechanics,1965,22(2):321-335.
[7]  Jameson G J.Cetinbudaklar A.Concurrent gas-liquid flow[M].New York:Plenum Press,1969:57-59.
[8]  Kusuda H,Imura H.Stability of a liquid film in a countercurrent annular two-phase flow[J].Bulletin of JSME,1974,17(4):1613-1618.
[9]  Lmura H,Kusuda H.Flooding velocity in a counter-current annular two-phase flow[J].Chemical Engineering Science,1977,32(1):79-87.
[10]  Grolmes M A,Lambert G A.Flooding in vertical tubes[C]//AIChE Symposium on Multiphase Flow Systems.Glasgow,Scotland:AIChE,1974:46-54.
[11]  Yehuda T,Dvora B.Counter current gas-liquid vertical flow, model for flow pattern and pressure drop [J].International Journal of Multiphase Flow,1984,9(6):637-647.
[12]  Barbosa J,Govan A H,Hewitt G F.Visualisation and modelling studies of churn flow in a vertical pipe[J]. Multiphase Flow,2001,27(12):2105-2127.
[13]  马虎根,涂文静,谢荣建,等.微尺度通道内气液两相流型可视化研究[J].中国电机工程学报,2011,31(29):87-92.Ma Hugen,Tu Wenjing,Xie Rongjian,et al.Visualization on flow pattern with vapor-liquid two-phase flow in micro-channel[J].Proceedings of the CSEE,2011,31(29):87-92(in Chinese).
[14]  Hirt C W,Nichols B D.Volume of fluid (VOF) method for the dynamics of free boundaries[J].Journal of Computational Physics,1981,39(1):201-225.
[15]  Morton K W,Baibnes M J.Numerical methods for fluid dynamics[M].New York:Academic Press,1982:273-274.
[16]  Brackbill J U,Kothe D B,Zemach C.A continuum method for modeling surface tension[J].Computer Physics,1992,100(2):335–354.
[17]  Adamson A W,Gast A P.Physical chemistry of surface[M].New York:John Wiley & Sons,1976:6-8.
[18]  瓦尔特H U.空间流体科学与空间材料科学[M].葛培文,王景涛,译.北京:中国科学技术出版社,1991:14-15.Walter H U.Fluid sciences and materials science in space[M].Ge Peiwen,Wang Jingtao,trans..Beijing:China Science and Technology Press,1991:14-15(in Chinese).
[19]  阎昌琪,孙福泰,孙仲宁.管径和气体入口条件对淹没过程的影响[J].核动力工程,1993,14(3):238-243.Yan Changqi,Sun Futai,Sun Zhongning.Effect of diameter and air inlet on flooding[J].Nuclear Power Engineering,1993,14(3):238-243(in Chinese).
[20]  阎昌琪,黄渭堂,王文祥,等.竖管内淹没及其消失滞后问题的研究[J].核科学与工程,1994,14(1):34-40.Yan Changqi,Huagn Weitang,Wang Wengxiang,et al.Study on flooding and hysteresis of deflooding in vertical tubes[J].Chinese Journal of Nuclear Science and Engineering,1994,14(1):34-40(in Chinese).

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133