Abstract
In this work, the wall shear stress and the mass transfer coefficient of the gas–liquid two-phase upward slug flow in a vertical pipe are investigated experimentally, using limiting diffusion current probes and digital high-speed video system. In experiments, the instantaneous and averaged characteristics of wall shear stress and mass transfer coefficient are concerned. The experimental results are compared with the numerical results in previous paper of the authors. Both experiment and numerical simulation show that the superficial gas and liquid velocities have an obvious influence on the instantaneous characteristics of the two profiles. The mass transfer coefficient has characteristics similar to the wall shear stress. The instantaneous wall shear stress and mass transfer coefficient profiles have the periodicity of slug flow. The averaged wall shear stress and mass transfer coefficient increase with increased superficial gas velocity. However, there is inconsistency in the variation trends of the averaged wall shear stress and mass transfer coefficient with superficial liquid velocity between experimental result and numerical simulation result, which can be attributed to the difference in flow condition. Moreover, the Taylor bubble length is also another impacting factor. The experimental and numerical results all shows that the product scale can not be damaged directly by the flow movement of slug flow. In fact, the alternative forces and fluctuations with high frequency acting on the pipe wall due to slug flow is the main cause for the slug flow enhanced CO2 corrosion process.
Similar content being viewed by others
References
Ahmad WR, DeJesus JM, Kawaji M (1998) Falling film hydrodynamics in slug flow[J]. Chem Eng Sci 53(1):123–130
DeJesus JD, Ahmad W, Kawaji M (1995) Experimental study of flow structure in vertical slug flow[C]. Elsevier Science Ltd, Kyoto, pp P9-51–P59-55
Kawaji M, DeJesus JM, Tudose G (1997) Investigation of flow structures in vertical slug flow[J]. Nucl Eng Des 175(1–2):37–48
Polonsky S, Shemer L, Barnea D (1999) The relation between the Taylor bubble motion and the velocity field ahead of it[J]. Int J Multiph Flow 25(6–7):957–975
Van Hout R, Gulitski A, Barnea D et al (2002) Experimental investigation of the velocity field induced by a Taylor bubble rising in stagnant water[J]. Int J Multiph Flow 28(4):579–596
Shemer L, Gulitski A, Barnea D (2005) Experiments on the turbulent structure and void fraction distribution in the Taylor bubble wake[J]. Multiph Sci Technol 17(1–2):103–122
Shemer L, Gulitski A, Barnea D (2007) On the turbulent structure in the wake of Taylor bubbles rising in vertical pipes[J]. Phys Fluids 19:035108
Liu TJ (1997) Investigation of the wall shear stress in vertical bubbly flow under different bubble size conditions[J]. Int J Multiph Flow 23(6):1085–1109
Maley LC, Jepson WP (2000) Wall shear stress and differential pressure in large-diameter horizontal multiphase pipelines[J]. J Energy Resour Technol 122:193–197
Wang H, Vedapuri D, Cai JY et al (2001) Mass transfer coefficient measurement in water/oil/gas multiphase flow[J]. J Energy Resour Technol 123:144
Wang S, Nesic S (2003) On coupling CO2 corrosion and multiphase flow models[J]. CORROSION 2003
Efird KD (2000) Flow-induced corrosion. Uhlig s corrosion handbook, 2nd edn, pp 233–248
Cognet G, Lebouche M, Souhar M (1984) Wall shear measurements by electrochemical probe for gas–liquid two-phase flow in vertical duct[J]. AIChE J 30(2):338–341
Hanratty TJ (1991) Use of the polarographic method to measure wall shear stress[J]. J Appl Electrochem 21(12):1038–1046
Mao ZS, Dukler AE (1989) An experimental study of gas–liquid slug flow[J]. Exp Fluids 8(3):169–182
Zheng D, Che D (2006) Experimental study on hydrodynamic characteristics of upward gas–liquid slug flow[J]. Int J Multiph Flow 32(10–11):1191–1218
Zheng D, Che D (2007) An investigation on near wall transport characteristics in an adiabatic upward gas–liquid two-phase slug flow[J]. Heat Mass Transf 43(10):1019–1036
Mao ZS, Dukler AE (1990) The motion of Taylor bubbles in vertical tubes I. A numerical simulation for the shape and rise velocity of Taylor bubbles in stagnant and flowing liquid[J]. J Comput Phys 91(1):132–160
Mao ZS, Dukler AE (1991) The motion of Taylor bubbles in vertical tubes II. Experimental data and simulations for laminar and turbulent flow[J]. Chem Eng Sci 46(8):2055–2064
Bugg JD, Mack K, Rezkallah KS (1998) A numerical model of Taylor bubbles rising through stagnant liquids in vertical tubes[J]. Int J Multiph Flow 24(2):271–281
Clarke A, Issa RI (1997) A numerical model of slug flow in vertical tubes[J]. Comput Fluids 26:395–415
Taha T, Cui ZF (2006) CFD modelling of slug flow in vertical tubes[J]. Chem Eng Sci 61(2):676–687
Zheng D, He X, Che D (2007) CFD simulations of hydrodynamic characteristics in a gas–liquid vertical upward slug flow[J]. Int J Heat Mass Transf 50(21–22):4151–4165
Yan K, Che D (2011) Hydrodynamic and mass transfer characteristics of slug flow in a vertical pipe with and without dispersed small bubbles[J]. Int J Multiph Flow 37(4):299–325
Yan K, Che D (2010) A coupled model for simulation of the gas–liquid two-phase flow with complex flow patterns[J]. Int J Multiph Flow 36(4):333–348
Fouad MG, Ibl N (1960) Natural convection mass transfer at vertical electrodes under turbulent flow conditions[J]. Electrochim Acta 3(3):233–243
Nakoryakov VE, Kashinsky ON, Kozmenko BK (1986) Experimental study of gas–liquid slug flow in a small-diameter vertical pipe[J]. Int J Multiph Flow 12(3):337–355
Nakoryakov VE, Kashinsky ON, Burdukov AP et al (1981) Local characteristics of upward gas–liquid flows[J]. Int J Multiph Flow 7(1):63–81
Hanratty TJ, Reiss LP (1962) Measurement of instantaneous rate of mass transfer to a small sink on a wall[J]. AIChE J 8:245–250
Reiss LP, Hanratty TJ (1963) An experimental study of the unsteady nature of the viscous sublayer[J]. AIChE J 9(2):154–160
Schmitt G, Gudde T (1995) Local mass transfer coefficients and local wall shear stresses at flow disturbances[C]. CORROSION/1995, NACE, Paper No. 102
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Yan, K., Zhang, Y. & Che, D. Experimental study on near wall transport characteristics of slug flow in a vertical pipe. Heat Mass Transfer 48, 1193–1205 (2012). https://doi.org/10.1007/s00231-012-0969-y
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00231-012-0969-y