Published 8 issues per year
ISSN Print: 1065-5131
ISSN Online: 1563-5074
Indexed in
HELICAL VORTICES AND DECAY IN A VERTICAL GAS-LIQUID TWO-PHASE FLOW INDUCED BY A SHORT TWISTED TAPE
ABSTRACT
Twisted tape has been widely used in industry and heat transfer enhancement. However, most research is focused on the single-phase flow induced by the tape; the flow characteristics in the gas-liquid two-phase flow induced by the tape are largely unexplored. In this work, vortex motion and decay characteristics in a gas-liquid two-phase swirl flow induced by a short twisted tape were studied by numerical simulation, and two parameters used to quantitatively describe the decay in a two-phase swirl flow have been proposed. Calculated results show that two corotating helical vortices appear and remain in the swirling flow, and these vortices significantly influence liquid distribution. Two peaks of liquid film thickness appear in the circumferential direction, and the liquid film gradually becomes uniform along the streamwise direction. Low pressure core locates near the region with thick liquid film instead of the vortex center. Two parameters, two-phase absolute vortex flux and swirl number, have been proposed to quantitatively describe the decay in a gas-liquid two-phase swirl flow. The parameters show that swirl decays quickly with increasing gas velocity and decreasing liquid velocity in the two-phase swirl flow. Finally, a correlation has been developed to describe the swirl decay in a gas-liquid two-phase flow. The research results will have an important meaning for heat exchanger and heat transfer enhancement in industry.
-
Abu-Khader, M.M., Further Understanding of Twisted Tape Effects as Tube Insert for Heat Transfer Enhancement, Heat Mass Transf., vol. 43, pp. 123-134,2006.
-
Aidun, C.K. and Parsheh, M., Spatially Periodic Reversing Core in a Twisted Fin Generated Swirling Pipe Flow, Phys. Fluids., vol. 19, no. 6, pp. 1-4,2007.
-
Aydin, O., Avci, M., Markal, B., and Yazici, M.Y., An Experimental Study on the Decaying Swirl Flow in a Tube, Int. Commun. Heat Mass Transf., vol. 55, pp. 22-28,2014.
-
Bergles, A.E. and Manglik, R.M., Enhanced Heat and Mass Transfer in the New Millennium: A Review of the 2001 Literature, J. Enhanced Heat Transf., vol. 11, no. 2, pp. 87-118,2004.
-
Bergles, A.E. and Manglik, R.M., Current Progress and New Developments in Enhanced Heat and Mass Transfer, J. Enhanced Heat Transf., vol. 20, no. 1, pp. 1-15,2013.
-
Bali, T., Modelling of Heat Transfer and Fluid Flow for Decaying Swirl Flow in a Circular Pipe, Int. Commun. Heat Mass Transf., vol. 25, no. 3, pp. 349-358,1998.
-
Boussinesq, J., Essay on the Theory of Flowing Waters, Acad. Sci. Paris Mem, Sci. Math. Phys., vol. 23, pp. 1-680,1877.
-
Cazan, R. and Aidun, C.K., Experimental Investigation of the Swirling Flow and the Helical Vortices Induced by a Twisted Tape inside a Circular Pipe, Phys. Fluids., vol. 21, pp. 1-9,2009.
-
Chen, C.I., Chen, C.K., and Yang, Y.T., Nonlinear Stability Analysis of Thin Condensate Falling Film inside a Rotating Vertical Cylinder, Int. J. Heat Mass Transf., vol. 49, pp. 707-717,2006.
-
Fluent Inc., ANSYS Fluent User's Guide, Lebanon, NH: Fluent Inc., 2003.
-
Gupta, A.K., Lilley, D.G., and Syred, N., Swirl Flows, Kent, UK: Abacus Press, 1984.
-
Hejazi, V., Akhavan-Behabadi, M.A., and Afshari, A., Experimental Investigation of Twisted Tape Inserts Performance on Condensation Heat Transfer Enhancement and Pressure Drop, Int. Commun. Heat Mass Transf., vol. 37, no. 9, pp. 1376-1387,2010.
-
Jensen, M.K., An Evaluation of the Effect of Twisted Tape Swirl Generators in Two-Phase Flow Heat Exchangers, Heat Transf. Eng., vol. 6, no. 4, pp. 19-30,1985.
-
Kreith, F. and Sonju, O.K., The Decay of a Turbulent Swirl in a Pipe, J. Fluid Mech, vol. 22, no. 2, pp. 257-271,1965.
-
Kanizawa, F.T., Hernandes, R.S., de Moraes, A.A.U., and Ribatski, G., A New Correlation for Single and Two-Phase Flow Pressure Drop in Round Tubes with Twisted-Tape Inserts, J. Braz. Soc. Mech. Sci. Eng., vol. 33, pp. 243-250,2011.
-
Liu, L., Wang, K., and Bai, B.F., Comparative Investigation of Liquid Film Thickness and Interfacial Wave Properties of Swirling Gas-Liquid Flows, Chem. Eng. Sci., vol. 213, no. 23, p. 115407,2020.
-
Liu, W., Lv, X.F., and Bai, B.F., Axial Development of Air-Water Annular Flow with Swirl in a Vertical Pipe, Int. J. Multiphase Flow, vol. 124, p. 103165,2019.
-
Liu, L. and Bai, B.F., A Mechanistic Model for the Prediction of Swirling Annular Flow Pattern Transition, Chem. Eng. Sci, vol. 199, no. 18, pp. 405-416,2019a.
-
Liu, W. and Bai, B.F., Swirl Decay in the Gas-Liquid Two-Phase Swirling Flow inside a Circular Straight Pipe, Exp. Therm. Fluid Sci, vol. 68, pp. 187-195,2015.
-
Liu, W. and Bai, B.F., A Numerical Study on Helical Vortices Induced by a Short Twisted Tape in a Circular Pipe, Case Stud. Therm. Eng., vol. 5, pp. 134-142,2015a.
-
Lin, Z.M., Sun, D.L., and Wang, L.B., The Relationship between Absolute Vorticity Flux along the Main Flow and Convection Heat Transfer in a Tube Inserting a Twisted Tape, Heat Mass Transf., vol. 45, no. 11, pp. 1351-1363,2009.
-
Molina, R., Wang, S., Gomez, L.E., Mohan, R.S., Shoham, O., and Kouba, G., Wet Gas Separation in Gas-Liquid Cylindrical Cyclone Separator, J. Energy Res. Technol., vol. 130, no. 4, pp. 1-13,2008.
-
Miiller-Steinhagen, H. and Heck, K., A Simple Friction Pressure Drop Correlation for Two-Phase Flow in Pipes, Chem. Process Eng., vol. 20, pp. 297-308,1986.
-
Najafi, A.F., Mousavian, S.M., and Amini, K., Numerical Investigations on Swirl Intensity Decay Rate for Turbulent Swirling Flow in a Fixed Pipe, Int. J. Mech. Sci., vol. 53, no. 10, pp. 801-811,2011.
-
Patankar, S.V. and Spalding, D.B., A Calculation Procedure for Heat, Mass and Momentum Transfer in Three-Dimensional Parabolic Flows, Int. J. Heat Mass Transf., vol. 15, no. 10, pp. 1787-1806,1972.
-
Sheikholeslami, M., Jafaryar, M., Saleem, S., Li, Z., Shafee, A., and Yu, J., Nanofluid Heat Transfer Augmentation and Exergy Loss inside a Pipe Equipped with Innovative Turbulators, Int. J. Heat Mass Transf, vol. 126, pp. 156-163,2018.
-
Vasiliev, L.L., Zhuravlyov, A.S., and Shapovalov, A., Heat Transfer Enhancement in Mini Channels with Micro/Nano Particles Deposited on a Heat-Loaded Wall, J. Enhanced Heat Transf., vol. 19, no. 1, pp. 13-24, 2012.
-
Xu, Z.G., Qu, Z., Zhao, C.Y., and Tao, W.Q., Experimental Study of Pool Boiling Heat Transfer on Metallic Foam Surface with U-Shaped and V-Shaped Grooves, J. Enhanced Heat Transf., vol. 19, no. 6, pp. 549-559,2012.
-
Yin, J., Qian, Y., Ma, Y., and Wang, D., Experimental Study on the Bubble Trajectory in an Axial Gas-Liquid Separator Applied for Tritium Removal for Molten Salt Reactors, Nucl. Eng. Des., vol. 320, no. 15, pp. 133-140,2017.
-
Zhang, C.C., Wang, D.B., and Zhu, Y.J., Numerical Study on Heat Transfer and Flow Characteristics of a Tube Fitted with Double Spiral Spring, Int. J. Therm. Sci, vol. 94, no. 8, pp. 18-27,2015.