CIESC Journal ›› 2017, Vol. 68 ›› Issue (2): 575-583.doi: 10.11949/j.issn.0438-1157.20160927

Previous Articles     Next Articles

Numerical simulations on sheet region of spray cooling process of pressure-swirl nozzle

PAN Yangmin1, LUO Yiqing1,2, WANG Liwen1, YUAN Xigang1,2,3   

  1. 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
    2. Chemical Engineering Research Center, Tianjin University, Tianjin 300072, China;
    3. State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, China
  • Received:2016-07-04 Revised:2016-12-14 Online:2017-02-05 Published:2016-12-30
  • Supported by:

    supported by the National Natural Science Foundation of China(21676183).

Abstract:

The commercial software Fluent 15.0 is employed to carry out the numerical simulation on the internal and external flow fields of the pressure-swirl nozzle. The axisymmetric 3-D flow field is represented by an equivalent 2-D grid. The VOF multiphase flow model and Reynolds stress model (RSM) are chosen. Numerical simulations on flow fields are performed in two different circumstances:① Gas phase is specified as air and there is no heat and mass transfer between phases; ② Gas phase is saturated steam, heat and mass transfer exists between phases. Lee model, a computational model embedded in Fluent 15.0, is specified as the phase-transition model of heat transfer. Comparisons between CFD simulations and experiment are launched. The internal and external flow fields are analyzed based on simulation datum. Results indicate that an air core forms inside the nozzle due to the helical motion of liquid phase, velocity of which increases sharply at the junction of contraction section and orifice's straight pipe section of the nozzle. Furthermore, comparisons are also performed between circumstance ① and ②. Numerical simulation results indicate that when heat and mass transfer exists between phases (i.e. in case of circumstance ②), (1) pressure of the flow fields is slightly lower and peak velocity is larger; (2) heat transfer coefficient of liquid film decreases gradually along the flow direction; (3)the film is thicker due to the vapor condensation, and liquid film breakup length is larger.

Key words: nozzle, fluid mechanics, numerical simulation, mass transfer, Lee model

CLC Number: 

  • TQ021.3

[1] 陈建民, 杨娜, 罗铭芳, 等. 常减压装置减压深拔技术研究进展[J]. 现代化工, 2010, 6:20-24. CHEN J M, YANG N, LUO M F, et al. Research progress in deep-cut technology in crude oil distillation unit[J]. Modern Chemical Industry, 2010, 6:20-24.
[2] 徐刚.CFD在旋流喷嘴设计中的应用研究[D].上海:上海交通大学, 2008. XU G. Applied research of CFD in the design of pressure-swirl nozzle[D]. Shanghai:Shanghai Jiao Tong University, 2008.
[3] ARUNVIJAY G, SHENBAGA N, MANIVANNAN A. Internal and external flow characteristics of swirl atmizers:a review[J]. Atomization and Sprays, 2015, 25(2):153-188.
[4] ABULLAH A, INGO J, HAL G, et al. Numerical simulation of water spray in natural draft dry cooling towers with a new nozzle representation approach[J]. Applied Thermal Engineering, 2016, 98:924-935.
[5] KIM S, KHIL T, KIM D, et al. Effect of geometric parameters on the liquid film thickness and air core formation in a swirl injector[J]. Measurement Science and Technology, 2010, 21(3):015403.
[6] JENG S M, JOG M A. Computational and experimental study of liquid sheet emanating from simplex fuel nozzle[J]. AIAA, 1998, 36(2):201-207.
[7] BELHADEF A, VALLET A, AMIELH M, et al. Pressure-swirl atomization:modeling and experimental approaches[J]. International Journal of Multiphase Flow, 2012, 39:13-20.
[8] Amini G. Liquid flow in a simplex swirl nozzle[J]. International Journal of Multiphase Flow, 2016, 79:225-235.
[9] WEINBERG S. Heat transfer to low pressure sprays of water in a steam atmosphere[J]. Inst. Mech. Engrs., 1952, 6(1B):240-253.
[10] MAYINGER F, CHAVEZ A. Measurement of direct contact condensation of pure saturated vapor on an injection spray by applying pulsed laser holography[J]. Int. J. Heat Mass Transf., 1992, 35(3):691-702.
[11] LEKIC A, FORD J D. Direct contact condensation of vapour on a spray of subcooled liquid droplets[J]. Int. J. Heat Mass Transfer, 1980, 23:1531-1537.
[12] LEE S Y, TANKIN R S. Study of liquid spray (water) in a condensable environment (steam)[J]. Int. J. Heat Mass Transfer, 1984, 27(3):363-374.
[13] TAKAHASHI M, NAYAK A K, KITAGAWA S I, et al. Heat transfer in direct contact condensation of steam to subcooled water spray[J]. Journal of Heat Transfer, 2001, 123(4):703-710.
[14] MA Z. Investigation on the internal flow characteristics of pressure-swirl atomizer[D]. Cincinnati:University of Cincinnati, 2001.
[15] 王福军. 计算流体动力学分析--CFD软件原理与应用[M]. 北京:清华大学出版社, 2004:7-13. WANG F J. Computational Fluid Dynamics Analysis-the Principle and Application of CFD Software[M]. Beijing:Tsinghua University Press, 2004:7-13.
[16] LEE W H. A Pressure Iteration Scheme for Two-phase Flow Modeling[M]. Washington:Hemishpere Publishing, 1980:50-200.
[17] LIU Z Y, SUNDEN B, YUAN J L. VOF modeling and analysis of filmwise condensation between vertical parallel plates[J]. Heat Transfer Research, 2012, 43(1):47-68.
[18] CHEN S, YANG Z, DUAN Y, et al. Simulation of condensation flow in a rectangular microchannel[J]. Chem. Eng. Process.:Process Intensification, 2014, 76:60-69.
[19] DARIVA E, DELCOL D. Effect of gravity during condensation of R134a in a circular minichannel[J]. Microgravity Sci. Tech., 2011, 23:87-97.
[20] LEE H, KHARANGATE C R, MASCAR ENHAS N, et al. Experimental and computational investigation of vertical downflow condensation[J]. International Journal of Heat and Mass Transfer, 2015, 85:865-879.
[21] KNUDSEN M. Kinetic Theory of Gases:Some Modern Aspects[M]. New York:Wiley Press, 1950:103-160.
[22] HIBIKI T. One-group interfacial area transport of bubbly flows in vertical round tubes[J]. International Journal of Heat and Mass Transfer, 2000, 43:2711-2726.
[23] IBRAHIM A A. Comprehensive study of internal flow field and linear and nonlinear instability of an annular liquid sheet emanating from an atomizer[D]. Cincinnati:University of Cincinnati, 2006.
[24] XIE K C. Numerical simulation of the flow characteristics within a pressure-swirling atomizer[C]//Turbo Expo 2014. Turbine Technical Conference and Exposition. Germany:ASME, 2014:1-5.

[1] HU Chenhui, WANG Yifei, BAO Zebin, YU Guangsuo. Effect of solid particles in evaporative hot water tower on bubble movement [J]. CIESC Journal, 2019, 70(1): 39-48.
[2] XIONG Pan, YAN Shuguang, LIU Weiyin. Structure optimization of cyclone based on response surface method [J]. CIESC Journal, 2019, 70(1): 154-160.
[3] LI Jingyan, LIU Zhongliang, ZHOU Yu, LI Yanxia. Study of thermal-hydrologic-mechanical numerical simulation model on CO2 plume geothermal system [J]. CIESC Journal, 2019, 70(1): 72-82.
[4] WANG Li, WU Weidong, HU Kun. Influence of circulating air quantity on cooling system and water producing performance of new household pure water machine [J]. CIESC Journal, 2019, 70(1): 99-106.
[5] SUN Xing, XU Keke, MENG Hua. Supercritical-pressure heat transfer of n-decane with fuel pyrolysis in helical tube [J]. CIESC Journal, 2018, 69(S1): 20-25.
[6] WANG Dongxiang, LING Xiang, CUI Zhengwei, YU Jianfeng. Ligament breakup characteristics of high viscous non-Newtonian thin liquid film in centrifugal atomization process [J]. CIESC Journal, 2018, 69(9): 3799-3805.
[7] LI Bin, ZHANG Shangbin, ZHANG Lei, TENG Zhaoyu, WANG Youtian. Numerical simulation of bubble-particle flow in bubbling bed based on LBM-DEM [J]. CIESC Journal, 2018, 69(9): 3843-3850.
[8] ZHONG Yingjie, HUANG Qi, DENG Kai, ZHAO Chuangyao, SU Yihua. Analysis of flow characteristics in triangular grooved channel by pulsating flow at low Reynolds number [J]. CIESC Journal, 2018, 69(9): 3806-3813.
[9] CHU Tong, YANG Yuesuo, LU Ying, WU Yuhui, CHEN Yu, DU Xinqiang. Thermal enhanced air sparging for oil contamination remediation in shallow groundwater of cold regions [J]. CIESC Journal, 2018, 69(8): 3701-3710.
[10] LIU Bingbing, WANG Mingyu, GAO Hongtao, ZHANG Shaojun. Composite model of heat transfer and phase transition with high gas and liquid density ratio [J]. CIESC Journal, 2018, 69(8): 3418-3427.
[11] SUN Ziwen, CHEN Dailin, ZHONG Wenqi, YU Ai-Bing. MP-PIC simulation of particle clusters in fast fluidized bed risers [J]. CIESC Journal, 2018, 69(8): 3443-3451.
[12] CHEN Guoqi, SUN Jianjun, SUN Dianfeng, MA Chenbo. Performance analysis of double-end self-pumping mechanical seal for main coolant pump of sodium-cooled fast reactor [J]. CIESC Journal, 2018, 69(8): 3565-3576.
[13] ZHOU Chilou, CHEN Guohua. Characterization of rubber O-ring seal in high-pressure gaseous hydrogen [J]. CIESC Journal, 2018, 69(8): 3557-3564.
[14] GU Xin, LUO Yuankun, XIONG Xiaochao, WANG Ke, TAO Zhilin. Influence of twisty flow heat exchanger's structural parameters on flow field and temperature field [J]. CIESC Journal, 2018, 69(8): 3390-3397.
[15] TAO Jinliang, HUANG Jiangang, XIAO Hang, YANG Chao, HUANG Qingshan. Influences of interstage height and superficial gas velocity in multistage internal airlift loop reactor on performance of mixing and mass transfer [J]. CIESC Journal, 2018, 69(7): 2878-2889.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!