Factor de Impacto:
Factor de Impacto de 5 años:
ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684
Volumen 29, 2019
Volumen 28, 2018
Volumen 27, 2017
Volumen 26, 2016
Volumen 25, 2015
Volumen 24, 2014
Volumen 23, 2013
Volumen 22, 2012
Volumen 21, 2011
Volumen 20, 2010
Volumen 19, 2009
Volumen 18, 2008
Volumen 17, 2007
Volumen 16, 2006
Volumen 15, 2005
Volumen 14, 2004
Volumen 13, 2003
Volumen 12, 2002
Volumen 11, 2001
Volumen 10, 2000
Volumen 9, 1999
Volumen 8, 1998
Volumen 7, 1997
Volumen 6, 1996
Volumen 5, 1995
Volumen 4, 1994
Volumen 3, 1993
Volumen 2, 1992
Volumen 1, 1991
Atomization and Sprays
INFLUENCE OF ENERGY EXCHANGE BETWEEN AIR AND LIQUID STREAMS ON SPRAY CHARACTERISTICS AND ATOMIZATION EFFICIENCY OF WATER-AIR IMPINGING JETS
School of Engineering, The University of British Columbia, 1137 Alumni Ave,
Kelowna, BC V1V 1V7, Canada
Khalifa University of Science and Technology, Abu Dhabi, United Arab
Department of Mechanical Engineering, Imperial College London London, SW7 2AZ, United Kingdom
Khalifa University of Science and Technology, Abu Dhabi, United Arab
The paper evaluates the interaction between atomization quality and atomization efficiency, of a twin water impinging jets atomizer. Liquid jet breakup length, liquid jets separation distance at the breakup region and spray angles were measured with high speed photography and spatial distributions of mean droplet velocities and diameters and normalized liquid volume flux with phase Doppler particle analyzer (PDPA). The results show that the breakup length decreased and the separation distance of the interacting liquid jets at the geometrical 'impingement' region increased rapidly as air-to-liquid momentum ratio (ALMR) increased and then remained constant for ALMR > 9. Spray angles were different on different planes through the spray and generally decreased with increasing ALMR and were insensitive to liquid jets impingement angle. The spatially-averaged Sauter mean diameter (SMD) of the sprays quantified uniquely the atomization quality and showed, for the first time, that it did not depend on liquid jets impingement angle. The atomization efficiency was quantified from the spatially-averaged SMD, for the first time, according to formalisms of Lefebvre (Lefebvre, A.H., Energy Considerations in Twin-Fluid Atomization, J. Eng. Gas Turbines Power, vol. 114, no. 1, pp. 89-96, 1992) and Pizziol et al. (Pizziol, B, Costa, M., Panao, M.O., and Silva, A., Multiple Impinging Jet Air-Assisted Atomization, Exp. Therm. Fluid Sci., vol. 96, pp. 303-310, 2018). The values of the atomization efficiency of Lefebvre's formalism were around 0.7% of the supplied air kinetic energy, in agreement with the measured energy exchange between the air and liquid streams up to liquid breakup, while the values of Pizziol et al. (2018) were larger.
Ashgriz, N., Impinging Jet Atomization, Handbook of Atomization and Sprays: Theory and Applications, New York: Springer Science and Business Media, pp. 685-707, 2011.
Avulapati, M.M. and Ravikrishna, R.V., Experimental Studies on Air-Assisted Impinging Jet Atomization, Int. J. Multiphase Flow, vol. 57, no. 8, pp. 88-101,2013.
Avulapati, M.M. and Ravikrishna, R.V., Experimental Studies on Air-Assisted Atomization of Jatropha Pure Plant Oil, Atomization Sprays, vol. 25, no. 7, pp. 553-569, 2015.
Beck, J.E., Lefebvre, A.H., and Koblish, T.R., Liquid Sheet Disintegration by Impinging Air Streams, Atomization and Sprays, vol. 1, no. 2, pp. 155-170, 1991.
Boden, J.C., Hardalupas, Y., Krenteras, P., and Taylor, A.M.K.P., Spray Characteristics from Free Impinging Air and Liquid Jets, Proc. of the 15th ILASS-Europe, Toulouse, France, 1999.
Collins, T.J., ImageJ for Microscopy, Biotechniques, vol. 43(1 Suppl), pp. 25-30, 2007.
Cossali, E. and Hardalupas, Y., Comparison between Laser Diffraction and Phase Doppler Velocimeter Techniques in High Turbidity, Small Diameter Sprays, Exp. Fluids, vol. 13, no. 6, pp. 414-422, 1992.
Dombrowski, N. and Hooper, P., A Study of the Sprays Formed by Impinging Jets in Laminar and Turbulent Flow, J. FluidMech, vol. 18, no. 3, pp. 392-400, 1964.
Engelbert, C., Hardalupas, Y., and Whitelaw, J.H., Breakup Phenomena in Coaxial Airblast Atomizers, Proc. R. Soc. London, Ser. A, vol. A451, no. 1941, pp. 189-229, 1995.
Eroglu, H., Chigier, N., and Farago, Z., Coaxial Atomizer Liquid Intact Lengths, Phys. Fluids A, vol. 3, no. 2, pp. 303-308, 1991.
Hardalupas, Y., Taylor, A.M.K.P., and Whitelaw, J.H., Velocity and Particle-Flux Characteristics of Turbulent, Particle-Laden Jets, Proc. R. Soc. London, Ser. A, vol. A426, no. 1870, pp. 31-78, 1989.
Hardalupas, Y., Taylor, A.M.K.P., and Whitelaw, J.H., Mass Flux, Mass Fraction and Concentration of Liquid Fuel in a Swirl-Stabilized Flame, Int. J. Multiphase Flow, vol. 20, no. 6, pp. 233-259, 1994.
Inoue, C., Watanabe, T., Himeno, T., and Uzawa, S., Impinging Atomization Enhanced by Microjet Injection-Effect, Mechanism and Optimization, 49th AIAA/ASME/SAE/ASEE Joint Propul. Conf., p. 3705,2013.
Knoll, K.E. and Sojka, P.E., Flat-Sheet Twin-Fluid Atomization of High Viscosity Fluids, Part I: Newtonian Liquids, Atomization Sprays, vol. 2, no. 1, pp. 17-36, 1992.
Lai, W., Shakal, J., and Troolin, D., Accuracy, Resolution and Repeatability of Powersight PDPA and LDV Systems, TSI Technical Note, p. 5001520 (A4), 2013.
Lasheras, J.C. and Hopfinger, E., Liquid Jet Instability and Atomization in a Coaxial Gas Stream, Annu. Rev. Fluid Mech, vol. 32, no. 1, pp. 275-308,2000.
Lefebvre, A.H., Energy Considerations in Twin-Fluid Atomization, J. Eng. Gas Turbines Power, vol. 114, no. 1,pp. 89-96, 1992.
Leroux, B., Delabroy, O., and Lacas, F., Experimental Study of Coaxial Atomizers Scaling, Part I: Dense Core Zone, Atomization Sprays, vol. 17, no. 5, pp. 381-407,2007.
Panao, M.R.O. and Delgado, J.M.D., Towards the Design of Low Flow-Rate Multijet Impingement Spray Atomizers, Exp. Therm. FluidSci, vol. 58, no. 18, pp. 170-179,2014.
Pizziol, B., Costa, M., Panao, M.O., and Silva, A., Multiple Impinging Jet Air-Assisted Atomization, Exp. Therm. Fluid Sci., vol. 96, pp. 303-310, 2018.
Prabhakaran, P. and Basavanahalli, R., Gas-on-Liquid Impinging Injectors: Some New Results, 49th AIAA/ASME/SAE/ASEE Joint Propul. Conf., p. 3706,2013.
Ramasubramanian, C., Notaro, V., and Lee, J.G., Characterization of Near-Field Spray of Nongelled- and Gelled-Impinging Doublets at High Pressure, J. Propul. Power, vol. 3, no. 6, pp. 1642-1652, 2015.
Sallam, K.A., Aalburg, C., andFaeth, G.M., Breakup of Round Nonturbulent Liquid Jets in Gaseous Cross-flow, AIAA J., vol. 42, no. 12, pp. 2529-2540, 2004.
Schneider, C.A., Rasband, W.S., and Eliceiri, K.W., NIH Image to ImageJ: 25 Years of Image Analysis, Nature Methods, vol. 9, no. 7, p. 671, 2012.
Sommerfeld, M. and Qiu, H.H., Particle Concentration Measurements by Phase-Doppler Anemometry in Complex Dispersed Two-Phase Flows, Exp. Fluids, vol. 18, no. 3, pp. 187-198, 1995.
Spalding, D.B., Combustion and Mass Transfer, 1st ed., Oxford, UK: Pergamon Press, pp. 199-217,1979.
Xia, Y., Khezzar, L., Alshehhi, M., and Hardalupas, Y., Droplet Size and Velocity Characteristics of Water-Air Impinging Jet Atomizer, Int. J. Multiphase Flow, vol. 94, no. 3, pp. 31-43, 2017.
Xia, Y., Alshehhi, M., Hardalupas, Y., and Khezzar, L., Spray Characteristics of Free Air-on-Water Impinging Jets, Int. J. Multiphase Flow, vol. 100, no. 7, pp. 86-103, 2018a.
Xia, Y., Khezzar, L., Alshehhi, M., and Hardalupas, Y., Atomization of Impinging Opposed Water Jets Interacting with Air Jet, Exp. Therm. Fluid Sci., vol. 93, no. 2, pp. 11-22, 2018b.