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| Effects of boundary slip on performance of upstream pumping mechanical seal |
| Chen Huilong1, Xu Cheng1, Hu Ji2, Liu Zhibin 1, Zhao Binjuan1, Li Shulin3 |
| 1.School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 3.Nanjing Engineering Institute of Aircraft Systems, AVIC Jincheng, Nanjing, Jiangsu 211100, China |
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Abstract To study effects of boundary slip on performance of upstream pumping mechanical seal, the geometric and computational models of fluid film are built. The Navier-Stokes equations of the fluid film flow are solved in Fluent by employing SIMPLEC algorithm and finite volume method. The boun-dary conditions are modified with the Navier linear slip model and the effects of boundary slip on the film pressure distribution, opening force, friction torque and fluid leakage are analyzed. The results show that the slip velocity has a greater influence than the location of slip occurrence. When the slip velocity is tinier, the results of simulation are almost the same as the data without slip, indicating the non-slip assumption for macro flow of a fluid is reasonable. However, when the slip is larger, the dynamic effect of fluid film is weakened and the opening force, friction torque and fluid leakage are decreased with the increasing slip velocity. Additionally, the reduction in both friction torque and leakage is more significant than that in opening force. If the opening force is smaller, the boundary slip should be avoided. If the opening force is large enough, the boundaries should be made super hydrophobic to introduce boundary slip effect so as to reduce the friction torque, eventually to save energy consumption. The results are useful to the design of an upstream pumping mechanical seal.
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Received: 03 June 2014
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| [1]吴承伟,马国军. 关于流体流动的边界滑移[J]. 力学进展,2008,38(3):265-282. Wu Chengwei,Ma Guojun.Boundary slip on fluid flow[J].Advances in Mechanics,2008,38(3):265-282.(in Chinese)[2]Neto C, Evans D R, Butt H J, et al. Boundary slip in Newtonian liquids: A review of experimental studies[J]. Reports on Progress in Physics,2005,68(12):2859-2897.[3]Navier C L M H.Mémoire sur les lois du mouvement des fluides[J]. Mém l′Acad Roy Sci l′Inst France,1823(6):389-440.[4]Schnell E.Slippage of water over nonwettable surfaces[J].Journal of Applied Physics,1956,27(10):1149-1152.[5]Pit R,Hervet H,Leger L.Direct experimental evidence of slip in hexadecane:Solid interfaces[J].Physical Review Letters,2000,85(5):980-983.[6]Craig V S J,Neto C,Williams D R M.Shear dependent boundary slip in an aqueous newtonian liquid[J].Phy-sical Review Letters,2001,87(5):054504.[7]凌智勇,刘勇,丁建宁,等. 亲水性和疏水性微管道中流动滑移特性的实验研究[J]. 中国机械工程,2006,17(22):2326-2329. Ling Zhiyong,Liu Yong,Ding Jianning,et al.Experimental study on the characteristics of slip in hydrophilic and hydrophobic microchannels[J].China Mechanical Engineering,2006,17(22):2326-2329.(in Chinese)[8]王馨,张向军,孟永钢,等. 微纳米间隙受限液体边界滑移与表面润湿性试验[J]. 清华大学学报:自然科学版,2008,48(8):1302-1305. Wang Xin,Zhang Xiangjun,Meng Yonggang,et al.Experimental study of boundary slip in conf ined liquids in micro/nano scale systems and the effect of interfacial wetting[J].Journal of Tsinghua University:Science and Technology,2008,48(8):1302-1305.(in Chinese)[9]David M H, Christian S, Dominik H,et al. Water slippage versus contact angle: A quasiuniversal relationship[J].Physicai Review Letters,2008,101(22):226101.[10]袁斌,张国贤,吴白羽,等. EMP径向滑动轴承边界滑移现象研究[J]. 润滑与密封,2000(1):29-30,42. Yuan Bin,Zhang Guoxian,Wu Baiyu,et al.Study on then interface slippage of EMP circularslidingbearng[J].Lubrication Engineering,2000(1):29-30,42.(in Chinese)[11]王小静,张国贤,张直明. 弹性金属塑料瓦推力轴承的滑移问题研究[J]. 润滑与密封,1997(4):19-22,35. Wang Xiaojing,Zhang Guoxian,Zhang Zhiming.Slip study of the plastic thrust bearing[J].Lubrication Engineering,1997(4):19-22,35.(in Chinese)[12]张新娇. 水滴与表面修饰类石墨基质相互作用分子动力学研究[D].北京:北京化工大学化工工程学院,2013.[13]付爱萍,冯大诚. 水在石墨面上吸附的理论研究[J]. 山东大学学报:自然科学版,1998,33(2):70-76. Fu Aiping,Feng Dacheng.A Theoretical study of molecular water adsorption on graphite[J].Journal of Shandong University:Science and Technology Edition,1998,33(2):70-76.(in Chinese)[14]文书明.微流边界层理论及其应用[M].北京:冶金工业出版社,2002.[15]彭建,鄢新华,左孝桐,等. 上游泵送密封研究[J]. 流体机械,1998,26(2):3-8. Peng Jian,Yan Xinhua,Zuo Xiaotong,et al.Study of upstream pumping mechanical seal[J].Fluid Machinery,1998,26(2): 3-8.(in Chinese)[16]许鹏先,潘琦,申改章. 基于滑移边界的干气密封的数值模拟[J]. 润滑与密封,2007,32(5):98-101. Xu Pengxian,Pan Qi,Shen Gaizhang.Simulation of the dry gas seal with slip boundary[J].Lubrication Engineering,2007,32(5):98-101.(in Chinese)[17]丁雪兴,苏虹,蒲军军,等. 基于二阶滑移边界的螺旋槽干气密封泄漏量计算与分析[J]. 应用力学学报,2013,30(1):49-53,145. Ding Xuexing, Su Hong, Pu Junjun,et al.Leakage calculation and analysis for the spiral groove dry gas seal based on the second-order slip boundary[J].Chinese Journal of Applied Mechanics,2013,30(1):49-53,145.(in Chinese)[18]陈汇龙,翟晓,赵斌娟,等. 多孔端面机械密封内流场的数值分析[J]. 排灌机械工程学报,2009,27(6):398-402. Chen Huilong,Zhai Xiao,Zhao Binjuan,et al.Numerical analysis on flow field in mechanical seal with porous seal ring face[J].Journal of Drainage and Irrigation Machi-nery Engineering,2009,27(6):398-402.(in Chinese)[19]Noël Brunetière, Bernard Tournerie. Numerical analysis of a surface-textured mechanical seal operating in mixed lubrication regime[J].Tribology International, 2012,49:80-89.[20]王国斌. 微尺度下油膜缝隙流动中的壁面滑移特性研究[D].北京:北京工业大学机械工程与应用电子技术学院,2011.[21]Zhang Jinfeng, Yuan Shouqi, Fu Yonghong, et al. A numerical simulation of 3-D inner flow in up-stream pumping mechanical seal[J]. Journal of Hydrodynamics B, 2006, 18(5):572-577.[22]Watanabe K, Yanuar U H. Drag reduction of Newtonian fluid in a circular pipe with a highly water-repellent wall[J]. Journal of Fluid Mechanics,1999,381:225-238.[23]Watanabe K,Yanuar M H. Slip of Newtonian fluid at slid boundary[J]. Fluids and Thermal Engineering,1999,41(3):525-529. |
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