管形对水平管降膜圆周膜厚和Nusselt数的影响

doi:10.3969/j.issn.0438-1157.2013.08.008

化工学报 ›› 2013, Vol. 64 ›› Issue (8): 2760-2768.DOI: 10.3969/j.issn.0438-1157.2013.08.008

管形对水平管降膜圆周膜厚和Nusselt数的影响

罗林聪¹, 潘继红¹, 田茂诚¹, 黄涛², 任毓程²

1. 山东大学能源与动力工程学院, 山东济南 250061;
2. 山西汾西热能工程有限公司, 山西太原 030027

收稿日期:2013-02-03 修回日期:2013-04-01 出版日期:2013-08-05 发布日期:2013-08-05
通讯作者: 田茂诚
作者简介:罗林聪(1987- ),男,博士研究生。
基金资助:
山东省科技攻关项目(2008GG10007009);山东科技发展计划项目(2012GGX10421)。

Influence of tube shape on falling water film thickness and Nusselt number outside horizontal tube

LUO Lincong¹, PAN Jihong¹, TIAN Maocheng¹, HUANG Tao², REN Yucheng²

1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China;
2. Shanxi FTEC Engineering Co., Ltd., Taiyuan 030027, Shanxi, China

Received:2013-02-03 Revised:2013-04-01 Online:2013-08-05 Published:2013-08-05
Supported by:
supported by the Key Scientific and Technological Project of Shandong Province(2008GG10007009)and the Science and Technology Development Planning of Shandong Province(2012GGX10421).

摘要/Abstract

摘要： 针对海水淡化系统的水平管降膜蒸发,建立了二维数值模型,分析了光滑圆管和6种不同截面形状的蛋形管外降膜流动及传热特性。采用VOF方法考察了不同管型对管外液膜分布和传热特性的影响。数值结果表明:蛋形管外液体沿周向流动较圆管稍快,且可获得更均匀更薄的液膜;液膜厚度随半轴比ε增大而减小,随周向先逐渐减小后迅速增加,圆管和蛋形管的液膜最小值分别出现在周向相对坐标0.69和0.70~0.84附近。蛋形管的膜内量纲1温度较圆管的小,其热边界层厚度较薄,具有更好的传热性能。拟合数据得到,ε为2.4的蛋形管具有最好的传热性能,其Nusselt数可达0.32,较圆管的高出12.68%。最后,将数值模拟结果与文献中的数据进行了对比,验证了数值模型的可行性和合理性。

关键词: 蛋形管, 降膜流动, 膜厚, Nusselt数

Abstract: The flow and heat transfer characteristics of falling water film outside horizontal tubes in falling film evaporators in seawater desalination were investigated with two-dimensional numerical simulation. Two types of tubes,including a smooth circular tube and six oval-shaped tubes were employed in the simulation.The physical model and mathematical equations for the circular tube and oval-shaped tubes are represented separately.Volume of fluid method is employed to investigate the influence of sectional shape of tube on distribution of film thickness and heat transfer performance.The numerical results indicate that the flow velocity of falling film on the oval-shaped tubes is larger and the film around the oval-shaped tube is more uniform and thinner than that around the circular tube.The film thickness grows with increasing semi-axis ratio,ε,and decreases gradually at first and then increases rapidly along the circumference.The minimum value of the film thickness appears approximately at the circumferential dimensionless position of 0.69 and 0.70-0.84 for the smooth circular tube and oval-shaped tubes,respectively.Compared with the circular tube,the oval-shaped tubes have lower dimensionless temperature and thinner thermal boundary layer,so that heat transfer performance is better.The oval-shaped tube with ε of 2.4 presents the best heat transfer performance with Nu of 0.32,which is 12.68% higher than that of the circular tube.The numerical results correlate well with the experimental and predicted data in literature.

Key words: oval-shaped tube, falling film, film thickness, Nusselt number

中图分类号:

TK124

罗林聪, 潘继红, 田茂诚, 黄涛, 任毓程. 管形对水平管降膜圆周膜厚和Nusselt数的影响[J]. 化工学报, 2013, 64(8): 2760-2768.

LUO Lincong, PAN Jihong, TIAN Maocheng, HUANG Tao, REN Yucheng. Influence of tube shape on falling water film thickness and Nusselt number outside horizontal tube[J]. CIESC Journal, 2013, 64(8): 2760-2768.

参考文献 32

[1]	Roques J F,Thome J R.Falling films on arrays of horizontal tubes with R-134a(Ⅱ):Flow visualization,onset of dryout,and heat transfer predictions[J].Heat Transfer Engineering,2007,28(5):415-434
[2]	He Maogang(何茂刚),Wang Xiaofei(王小飞),Zhang Ying(张颖).Review of prior research and new technology for horizontal-tube falling-film evaporator used in refrigeration[J].Journal of Chemical Industry and Engineering (China)(化工学报),2008,59(S2):23-28
[3]	Li W,Wu X Y,Luo Z,Webb R L.Falling water film evaporation on newly-designed enhanced tube bundles[J].International Journal of Heat and Mass Transfer,2011,54(13/14):2990-2997
[4]	Lü Kai(吕凯),Wang Xiaofei(王小飞),Zhang Ying(张颖),He Maogang(何茂刚).Departure-site spacing for liquid columns falling between horizontal circular tubes[J].CIESC Journal(化工学报),2012,63(3):740-745
[5]	Shen Shengqiang(沈胜强),Liang Gangtao(梁刚涛),Gong Luyuan(龚路远),Mu Xingsen(牟兴森),Liu Rui(刘瑞),Liu Xiaohua(刘晓华).Distribution of heat transfer coefficient in horizontal-tube falling film evaporator[J].CIESC Journal(化工学报),2011,62(12):3381-3385
[6]	Rifert V G,Podberezny V I,Putilin J V,Nikitin J G,et al. Heat transfer in thin film-type evaporator with profile tubes[J].Desalination,1989,74:363-372
[7]	Hu X,Jacobi A M.The intertube falling film (1):Flow characteristics,mode transitions and hysteresis[J].ASME J.Heat Transfer,1996,118:616-625
[8]	Hu X,Jacobi A M.The intertube falling film(2):Mode effects on sensible heat transfer to a falling liquid film[J].ASME J.Heat Transfer,1996,118:626-633
[9]	Jafar F A,Thorpe G R,Turan Ö F.Liquid film falling on horizontal circular cylinders//AFMC 16th Australasian Fluid Mechanics Conference[C].Australia,2007
[10]	Bourouni K,Chaibi M T,Tadrist L.Analytical analysis of heat transfer in liquid film dripping around a horizontal tube[J].Desalination,2001,141(1):7-13
[11]	Raach H,Mitrovic J.Simulation of heat and mass transfer in a multi-effect distillation plant for seawater desalination[J].Desalination,2007,204(1/2/3):416-422
[12]	Ouldhadda D,Idrissi A I,Asbik M.Heat transfer in non-Newtonian falling liquid film on a horizontal circular cylinder[J].Heat and Mass Transfer,2002,38(7):713-721
[13]	Sun F,Xu S,Gao Y.Numerical simulation of liquid falling film on horizontal circular tubes[J].Frontiers of Chemical Science and Engineering,2012:1-7
[14]	He Maogang(何茂刚),Wang Xiaofei(王小飞),Zhang Ying(张颖),Fei Jiyou(费继友).Study of flow regime and numerical simulation of film thickness on horizontal-tube falling film evaporator[J].Journal of Thermal Science and Technology(热科学与技术),2007,6(4):319-325
[15]	Wang Xiaofei(王小飞),He Maogang(何茂刚),Zhang Ying(张颖).Numerical simulation of the flowing outside the tube of the horizontal-tube falling film evaporator[J].Journal of Engineering Thermophysics(工程热物理学报),2008,29(8):1347-1350
[16]	Qiu Qinggang(邱庆刚),Chen Jinbo(陈金波).Influential analysis of tube arrangement and tube spacing on film distributions[J].Journal of Thermal Science and Technology(热科学与技术),2011,10(2):117-122
[17]	Qiu Qinggang(邱庆刚),Chen Jinbo(陈金波).Numerical simulation of film formation on horizontal-tube falling film evaporators[J].Journal of Chinese Society of Power Engineering(动力工程学报),2011,31(5):357-361,374
[18]	Lu Huixia(路慧霞),Ma Xiaojian(马晓建).Experimental on heat transfer of falling film evaporation on horizontal tubes[J].Chemical Industry and Engineering Progress(化工进展),2009,28(2):203-205,221
[19]	Roques J,Dupont V,Thome J.Falling film transitions on plain and enhanced tubes[J].Journal of Heat Transfer,2002,124:491-499
[20]	Chien L H,Tsai Y L.An experimental study of pool boiling and falling film vaporization on horizontal tubes in R-245fa[J].Applied Thermal Engineering,2011,31(17/18):4044-4054
[21]	Qi Chunhua(齐春华),Feng Houjun(冯厚军),Xing Yulei(邢玉雷),Zhao Heli(赵河立).Numerical simulation and experimental studies on falling film outside elliptical tube(Ⅱ):Experimental study[J].Chemical Industry and Engineering(化学工业与工程),2012,29(5):43-47,69
[22]	Qi Chunhua(齐春华),Xu Ke(徐克),Feng Houjun(冯厚军),Lü Qingchun(吕庆春).Numerical simulation and experimental studies on falling film outside elliptical tube(Ⅰ):CFD simulation[J].Chemical Industry and Engineering(化学工业与工程),2012,29(4):74-79
[23]	Asbik M,Ansari O,Zeghmati B.Numerical study of boundary layer transition in flowing film evaporation on horizontal elliptical cylinder[J].Heat and Mass Transfer,2005,41(5):399-410
[24]	Luo Lincong(罗林聪),Zhang Guanmin(张冠敏),Tian Maocheng(田茂诚),Pan Jihong(潘继红).Numerical simulation of liquid film flow on horizontal circular and shaped cylinders for falling film evaporation[J].Journal of Engineering Thermophysics(工程热物理学报),2013,34(4):1-5
[25]	Lei X L,Li H X.Numerical simulation of the behavior of falling films on horizontal plain tubes//AIP Conference Proceedings[C].2010
[26]	Hirt C W,Nichols B D.Volume of fluid(VOF)method for the dynamics of free boundaries[J].Journal of Computational Physics,1981,39:201-225
[27]	Rider W J,Kothe D B.Reconstructing volume tracking[J].Journal of Computational Physics,1998,141(2):112-152
[28]	Brackbill J,Kothe D B,Zemach C.A continuum method for modeling surface tension[J].Journal of Computational Physics,1992,100(2):335-354
[29]	Liu P J P.The evaporating falling film on horizontal tubes[D].Masison:University of Wisconsin-Madison,1975
[30]	Kocamustafaogullari G,Chen I.Falling film heat transfer analysis on a bank of horizontal tube evaporator[J].AIChE Journal,1988,34(9):1539-1549
[31]	Agunaoun A,Daïf A,Grisenti M,Barriol R.Transfert de chaleur dans un film tombant autour d'un cylindre horizontal[J].The Canadian Journal of Chemical Engineering,1994,72(6):961-965
[32]	Chen I Y.Heat transfer analysis of a falling-film horizontal tube evaporator[D].Milwaukee:The University of Wisconsin,1984

管形对水平管降膜圆周膜厚和Nusselt数的影响

Influence of tube shape on falling water film thickness and Nusselt number outside horizontal tube

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