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Heat Transfer from a Cylinder in Cross-Flow of Single and Multiphase Flows
Abstract:In this paper, the average heat transfer characteristics for a cross flow cylinder of 16 mm diameter in a vertical pipe has been studied for single-phase flow (water/oil) and multicomponent (non-boiling) flow (water-air, water-oil, oil-air and water-oil-air). The cylinder is uniformly heated by electrical heater placed at the centre of the element. The results show that the values of average heat transfer coefficients for water are around four times the values for oil flow. Introducing air as a second phase with water has very little effect on heat transfer rate, while the heat transfer increased by 70% in case of oil. For water–oil flow, the heat transfer coefficient values are reflecting the percentage of water up to 50%, but increasing the water more than 50% leads to a sharp increase in the heat transfer coefficients to become close to the values of pure water. The enhancement of heat transfer by mixing two phases may be attributed to the changes in flow structure near to cylinder surface which lead to thinner boundary layer and higher turbulence. For three-phase flow, the heat transfer coefficients for all cases fall within the limit of single-phase flow of water and oil and are very close to pure water values. The net effect of the turbulence augmentation due to the introduction of air and the attenuation due to the introduction of oil leads to a thinner boundary layer of oil over the cylinder surface covered by a mixture of water and air bubbles.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1128873Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1639
 Zukauskas, A. A., 1972, Heat transfer from tubes in cross-flow, Adv. Heat Transfer 8, 93–160.
 Morgan, V. T., 1975, The overall convective heat transfer from smooth circular cylinders, Adv. Heat Transfer 11. 199-264.
 Zukauskas, A. A., Ziugzda, J., 1985, Heat transfer of a cylinder in crossflow, Hemisphere Publishing Corporation,
 Sanitjai, S., Goldstein, R.J., 2004a, Forced convection heat transfer from a circular cylinder in cross-flow to air and liquids, Int. J. Heat Mass Transfer 47, 4785-4794.
 Hoelscher, J. F., 1965, study of heat transfer from heated cylinder in two-phase flow, water-air flow, MSc thesis, Air Force Institute of Technology, Ohio.
 Takahara, E. W., 1966, Experimental study of heat transfer from a heated circular cylinder in two-phase, water-air flow, MSc thesis, Air Force Institute of Technology, Ohio.
 V. P. Bobkov, V. F. Sinyavskii, and N. K. Savanin, Effect of gas phase on heat transfer in turbulent water flow in a model of compact triangular rod bundle, Translated from Inzhenerno-Fizicheskie Zhurnal 44 (1972), pp.362-367.
 Sanitjai, S., Goldstein, R.J., 2004b, Heat transfer from a circular cylinder to mixtures of water and ethylene glycol, Int. J. Heat Mass Transfer 47, 4795-4805.
 Hu, Z., Yang Y., Zhou, F., 2005, Study on the heat transfer of cross flow in vertical upward tubes, Journal of Zhejiang University Science 24, 1128-1131.
 Fand, R. M., 1965, Heat transfer by forced convection from a cylinder to water in cross-flow. Int. J. Heat Mass Transfer 8, 995–1010.
 Whitaker, S., 1972, Forced convection heat transfer calculations for flow in pipes, past flat plate, single cylinder, and for flow in packed beds and tube bundles. AIChE Journal 18, 361–371.
 Theofanous T. G., Sullivan, J., 1982, Turbulence in two-phase dispersed flows”, J. Fluid Mechanics 116, 343-362.
 Wang, S. K., Lee, S. J., Jones, O. C., Lahey, R.T., 1987, 3-D turbulence structure and phase distribution measurements in bubbly two-phase flows”, Int. J. Multiphase Flow 13, 327-343.
 Shawkat, M. E., Ching, C. Y., Shoukri, M., 2007, On the liquid turbulence energy spectra in two-phase bubbly flow in a large diameter vertical pipe, Int. J. Multiphase Flow 33, 300-316.
 Ghisalberti, L., Kondjoyan, A., 1999, Convective heat transfer coefficients between air flow and a short cylinder. Effect of air velocity and turbulence, effect of body shape, dimensions and position in the flow, Journal of Food Engineering 42, 33-44.
 Liu T. J., Bankoff, S.G., 1993, Structure of air-water bubbly flow in vertical pipe-II. void fraction, bubble velocity, and bubble size distribution”, Int. J. Heat and Mass Transfer 36, 1061-1072.
 Zhao, D., Guo, L., Hu, X., Zhang, X., Wang, X, 2006, Experimental study on local characteristics of oil-water dispersed flow in a vertical pipe”, Int. J. Multiphase Flow 32, 1254-1268.
 Hamad, F. H., Dlir A., Ganesan, P. B., 2014, Study of kerosene-water two-phase flow characteristics in vertical and inclined pipes, Can. J. Chem Eng, 92, 905-917.
 Krepper, E., Beyer, M., Frank, T., Lucas, D., Prasser, H., 2009, CFD modelling of polydispersed bubbly two-phase flow around an obstacle, Nuclear Engineering and Design 239, 2372–2381.
 Habeeb, L. J., Al-Turaihi, R. S., 2013, Experimental study and CFD simulation of two-phase flow around multi-shape obstacles in enlarging channel, American Journal of Mechanical Engineering 1, 470-486
 Alagesan V., Sundaram, S., 2012, Two-phase experimental heat transfer studies on a water-diesel system in a shell and tube heat exchanger 29, 275-283.