天然气液烃输送管道沸腾气泡起飞直径计算模型
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摘要
提出了一种改进的气泡起飞直径计算方法,用以表征天然气液烃在管道输送过程中流动沸腾的气液相间传热传质速率。考虑作用在气泡上的不稳定阻力、剪切升力、浮升力以及管道倾角等因素,基于受力平衡原理和气泡脱离壁面的临界条件,建立了新的气泡起飞直径模型,在此基础上分析了管道倾角对气泡起飞直径的影响情况。结果表明:文中模型计算的水平、垂直管道中气泡起飞直径与实验值的平均相对偏差分别为10. 07%和5. 1%,精度优于目前常用的Fritz,Cole,Kocamustaf,Farajisarir,Golorin,Kirichenko和Borinshansky-Fokin(B-F)模型。该模型还弥补了现有方法不能计算倾斜管道气泡起飞直径的不足。
An improved bubble lift-off diameter calculation method was proposed to represent the boiling heat and mass transfer rate between vapor and liquid phases in natural gas liquids transmission pipelines. With the consideration of many factors including the unstable resistance,shear lift,buoyancy force acting on the bubble,and the pipeline inclination,a new bubble lift-off diameter model was built based on the force-balance principle and the critical condition of the bubble escaping from the wall surface. Also,the effect of the pipe inclination angle on the bubble lift-off diameter was analyzed. The results show that,the average relative deviation between the calculated values and the experimental data for the horizontal pipelines and the vertical pipeline is equal to 10. 07% and5. 1%,respectively,which is more accurate than seven existing models,including Fritz,Cole,Kocamustaf,Farajisarir,Golorin,Kirichenko and Borinshansky-Fokin( B-F) models. Moreover,this model overcomes the shortcomings of existing methods that cannot be applied to calculate bubble lift-off diameters for inclined pipelines.
An improved bubble lift-off diameter calculation method was proposed to represent the boiling heat and mass transfer rate between vapor and liquid phases in natural gas liquids transmission pipelines. With the consideration of many factors including the unstable resistance,shear lift,buoyancy force acting on the bubble,and the pipeline inclination,a new bubble lift-off diameter model was built based on the force-balance principle and the critical condition of the bubble escaping from the wall surface. Also,the effect of the pipe inclination angle on the bubble lift-off diameter was analyzed. The results show that,the average relative deviation between the calculated values and the experimental data for the horizontal pipelines and the vertical pipeline is equal to 10. 07% and5. 1%,respectively,which is more accurate than seven existing models,including Fritz,Cole,Kocamustaf,Farajisarir,Golorin,Kirichenko and Borinshansky-Fokin( B-F) models. Moreover,this model overcomes the shortcomings of existing methods that cannot be applied to calculate bubble lift-off diameters for inclined pipelines.
引文
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[14]CHEN Y,GROLL M,MERTZ R,et al.Bubble dynamics of boiling of propane and iso-butane on smooth and enhanced tubes[J].Experimental Thermal&Fluid Science,2004,28(2/3):171-178.
[15]GONG Maoqiong,WU Yufeng,LI Ding,et al.Visualization study on nucleate pool boiling of ethane,isobutane and their binary mixtures[J].Experimental Thermal and Fluid Science,2013,51:164-173.
[2]王斯民,厉彦忠,文键,等.液氮过冷沸腾空泡份额分布规律的研究[J].化学工程,2009,37(2):15-18.
[3]贾文龙.天然气液烃输送管网仿真理论与技术研究[D].成都:西南石油大学,2014:61.
[4]邵雪锋,李祥东,汪荣顺.竖直环形通道内液氮流动沸腾的数值模拟[J].化学工程,2011,39(10):82-86.
[5]ZUBER N.Hydrodynamic aspects of boiling heat transfer[D].State of California:University of California,1959.
[6]LEE H C,OH B D,BAE S W,et al.Single bubble growth in saturated pool boiling on a constant wall temperature surface[J].International Journal of Multiphase Flow,2003,29(12):1857-1874.
[7]KIM J,KIM M H.On the departure behaviors of bubble at nucleate pool boiling[J].International Journal of Multiphase Flow,2006,32(10/11):1269-1286.
[8]陈汉梽,姚远,公茂琼,等.乙烷池内核态沸腾气泡脱离直径[J].化工学报,2018,69(4):1419-1427.
[9]CHO Y,YUM S,LEE J,et al.Development of bubble departure and lift-off diameter models in low heat flux and low flow velocity conditions[J].International Journal of Heat and Mass Transfer,2011,54(15/16):3234-3244.
[10]COLOMBO M,FAIRWEATHER M.Prediction of bubble departure in forced convection boiling:A mechanistic model[J].International Journal of Heat and Mass Transfer,2015,85:135-146.
[11]SITU R,HIBIKI T,ISHII M,et al.Bubble lift-off size in forced convective subcooled boiling flow[J].International Journal of Heat and Mass Transfer,2005,48(25/26):5536-5548.
[12]KLAUSNER J F,MEI R,BERNHARD D M,et al.Vapor bubble departure in forced convection boiling[J].International Journal of Heat and Mass Transfer,1993,36(3):651-662.
[13]MEI R,KLAUSNER J F.Shear lift force on spherical bubbles[J].International Journal of Heat&Fluid Flow,1994,15(1):62-65.
[14]CHEN Y,GROLL M,MERTZ R,et al.Bubble dynamics of boiling of propane and iso-butane on smooth and enhanced tubes[J].Experimental Thermal&Fluid Science,2004,28(2/3):171-178.
[15]GONG Maoqiong,WU Yufeng,LI Ding,et al.Visualization study on nucleate pool boiling of ethane,isobutane and their binary mixtures[J].Experimental Thermal and Fluid Science,2013,51:164-173.