World Academy of Science, Engineering and Technology
Published August 28, 2012 | Version 13903
Journal article Open

Gas-Liquid Flow on Smooth and Textured Inclined Planes

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Carbon Capture & Storage (CCS) is one of the various methods that can be used to reduce the carbon footprint of the energy sector. This paper focuses on the absorption of CO2 from flue gas using packed columns, whose efficiency is highly dependent on the structure of the liquid films within the column. To study the characteristics of liquid films a CFD solver, OpenFOAM is utilised to solve two-phase, isothermal film flow using the volume-of-fluid (VOF) method. The model was validated using existing experimental data and the Nusselt theory. It was found that smaller plate inclination angles, with respect to the horizontal plane, resulted in larger wetted areas on smooth plates. However, only a slight improvement in the wetted area was observed. Simulations were also performed using a ridged plate and it was observed that these surface textures significantly increase the wetted area of the plate. This was mainly attributed to the channelling effect of the ridges, which helped to oppose the surface tension forces trying to minimise the surface area. Rivulet formations on the ridged plate were also flattened out and spread across a larger proportion of the plate width.

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  • C. D. Ho, H. Chang, H. J. Chen, C. L. Chang, H. H. Li, and Y. Y. Chang, "CFD simulation of the two-phase flow for a falling film microreactor," International Journal of Heat and Mass Transfer, vol. 54, pp. 3740- 3748, 2011.
  • P. Chasanis, A. Lautenschleger, and E. Y. Kenig, "Numerical investigation of carbon dioxide absorption in a falling-film micro-contactor," Chemical Engineering Science, vol. 65, no. 3, pp. 1125-1133, 2010.
  • S. Freguia and G. T. Rochelle, "Modeling of CO2 capture by aqueous monoethanolamine," AIChE Journal, vol. 49, no. 7, pp. 1676-1686, 2003.
  • L. Raynal and A. Royon-Lebeaud, "A multi-scale approach for CFD calculations of gas-liquid flow within large size column equipped with structured packing," Chemical Engineering Science, vol. 62, no. 24, pp. 7196-7204, 2007.
  • M. Kohrt, I. Ausner, G. Wozny, and J. U. Repke, "Texture influence on liquid-side mass transfer," Chemical Engineering Research and Design, vol. 89, pp. 1405-1413, 2011.
  • M. R. Khosravi Nikou, M. R. Ehsani, and M. Davazdah Emami, "CFD Simulation of Hydrodynamics, Heat and Mass Transfer Simultaneously in Structured Packing," International Journal of Chemical Reactor Engineering, vol. 6, p. A91, 2008.
  • J. Chen, C. Liu, X. Yuan, and G. Yu, "CFD simulation of flow and mass transfer in structured packing distillation columns," Chinese Journal of Chemical Engineering, vol. 17, no. 3, pp. 381-388, 2009.
  • Y. Y. Xu, S. Paschke, J. U. Repke, J. Q. Yuan, and G. Wozny, "Computational Approach to Characterize the Mass Transfer between the Counter-Current Gas-Liquid Flow," Chemical Engineering & Technology, vol. 32, no. 8, pp. 1227-1235, 2009.
  • Y. Haroun, D. Legendre, and L. Raynal, "Direct numerical simulation of reactive absorption in gas-liquid flow on structured packing using interface capturing method," Chemical Engineering Science, vol. 65, no. 1, pp. 351-356, 2010. [10] B. Szulczewska, I. Zbicinski, and A. G'orak, "Liquid flow on structured packing: Cfd simulation and experimental study," Chemical engineering & technology, vol. 26, no. 5, pp. 580-584, 2003. [11] H. Lan, J. Wegener, B. Armaly, and J. Drallmeier, "Developing laminar gravity-driven thin liquid film flow down an inclined plane," Journal of Fluids Engineering, vol. 132, p. 081301, 2010. [12] Y. Y. Xu, S. Paschke, J. U. Repke, J. Q. Yuan, and G. Wozny, "Portraying the Countercurrent Flow on Packings by Three-Dimensional Computational Fluid Dynamics Simulations," Chemical Engineering & Technology, vol. 31, no. 10, pp. 1445-1452, 2008. [13] F. Gu, C. J. Liu, X. G. Yuan, and G. C. Yu, "CFD simulation of liquid film flow on inclined plates," Chemical engineering & technology, vol. 27, no. 10, pp. 1099-1104, 2004. [14] P. Valluri, O. K. Matar, G. F. Hewitt, and M. A. Mendes, "Thin film flow over structured packings at moderate Reynolds numbers," Chemical engineering science, vol. 60, no. 7, pp. 1965-1975, 2005. [15] A. Hoffmann, I. Ausner, J. U. Repke, and G. Wozny, "Fluid dynamics in multiphase distillation processes in packed towers," Computers & chemical engineering, vol. 29, no. 6, pp. 1433-1437, 2005. [16] A. Hoffmann, I. Ausner, J. Repke et al., "Detailed investigation of multiphase (gas-liquid and gas-liquid-liquid) flow behaviour on inclined plates," Chemical Engineering Research and Design, vol. 84, no. A2, pp. 147-154, 2006. [17] Y. Iso and X. Chen, "Flow Transition Behavior of the Wetting Flow Between the Film Flow and Rivulet Flow on an Inclined Wall," Journal of Fluids Engineering, vol. 133, p. 091101, 2011. [18] OpenCFD, OpenFOAM: The Open Source CFD Toolbox. User Guide Version 2.0.1. OpenCFD Ltd., Reading UK, 2011. [19] OpenCFD., OpenFOAM: The Open Source CFD Toolbox. Programmer-s Guide Version 2.0.1. OpenCFD Ltd., Reading UK, 2011. [20] C.W. Hirt and B.D. Nichols, "Volume of fluid (VOF) method for the dynamics of free boundaries," Journal of Computational Physics, vol. 39, no. 1, pp. 201 - 225, 1981. [21] H. Rusche, "Computational Fluid Dynamics of Dispersed Two-Phase Flows at High Phase Fractions," Ph.D. dissertation, Imperial College, University of London, Dec 2002. [22] E. Berberovi'c, N. P. van Hinsberg, S. Jakirli'c, I. V. Roisman, and C. Tropea, "Drop impact onto a liquid layer of finite thickness: Dynamics of the cavity evolution," Physical Review E, vol. 79, no. 3, p. 036306, 2009. [23] J. Brackbill, D. Kothe, and C. Zemach, "A continuum method for modeling surface tension," Journal of Computational Physics, vol. 100, no. 2, pp. 335-354, 1992. [24] W. Nusselt, "Die Oberflchenkondensation des Wasserdampfes," Zeitschrift des Vereines Deutscher Ingenieure, vol. 60, pp. 541-546 and 569-575, 1916. [25] C. F. Petre, F. Larachi, I. Iliuta, and B. P. A. Grandjean, "Pressure drop through structured packings: Breakdown into the contributing mechanisms by CFD modeling," Chemical engineering science, vol. 58, no. 1, pp. 163-177, 2003.