Time-Averaged Heat Transfer and Vortex Shedding of a Singular and Twin Heated Bluff Bodies in Cross Flow

  • Authors

    • A. Etminan
    • A. Sharifian
    • E. Reda
    • Z. Harun
    https://doi.org/10.14419/ijet.v7i3.17.25251
  • Vortex Shedding, Laminar Flow, Heat Transfer, Bluff Body, SIMPELC.

  • Flow characteristics in the onset of vortex shedding and heat transfer pattern over a single and two same-sized square prisms placed in tandem are studied numerically. All simulations are carried out for Reynolds numbers range varying from 1 to 200 and spacing between the prisms in the order of five widths of prism for in tandem configuration. The calculations are done employing a finite volume in-house computer program according to semi-implicit method for pressure linked equations-consistent (SIMPLEC) numerical procedure and non-staggered mesh in 2-dimensional, steady/unsteady and incompressible flow regimes. The instantaneous and time-averaged streamlines as well as iso-therm pattern for different Reynolds numbers are analysed. Furthermore, the influence of Reynolds number and the onset of vortex shedding on the flow pattern are studied in detail. Three distinct patterns namely fully-attached, trailing-edge separation and leading-edge separation were observed.

     

     

  • References

    1. [1] Sharma, A. and Eswaran, V. (2004), Heat and Fluid Flow across a Square Cylinder in the Two Dimensional Laminar Flow Regime. Numerical Heat Transfer, Part A: Application 45, 247-269.

      [2] Sohankar, A., Davidson, L. and Norberg, C. (1995), Numerical Simulation of Unsteady Flow Around a Square 2D Cylinder. The 12th Australasian Fluid Mechanics Conference, Bilger RW (ed.) 517-520.

      [3] Zdravkovich, M.M. (1997), Flow around Circular Cylinders, Oxford University Press, NewYork.

      [4] Zdravkovich, M.M. (1985), Flow-Induced Oscillations of Two Interfering Circular Cylinders. Journal of Sound and Vibration 101, 511-521.

      [5] Günter, S. (2001). Reynolds Number Effects in Flow Around more-or-less Bluff Bodies. Journal of Wind Engineering and Industrial Aerodynamics 89, 1267-1289.

      [6] Sarioglu, M. and Yavuz, T. (2002) Subcritical Flow Around Bluff Bodies. AIAA 40(7), 1257-1268.

      [7] Sohankar, A. (2006) Flow Over a Bluff Body from Moderate to High Reynolds Numbers Using Large Eddy Simulation. Computers and Fluids 35, 1154-1168.

      [8] Bhattacharyya, S., Singh, A. K. (2010) Vortex shedding and heat transfer dependence on effective Reynolds number for mixed convection around a cylinder in cross flow. International Journal of Heat and Mass Transfer 53(15-16), 3202-3212.

      [9] Etminan, A., Harun, Z. and Gharehchahi, H.R. (2014) Determination of Fluid Flow Characteristics and Pattern of Heat Transfer around a Prism at Incidence. Ciência e Técnica Vitivinícola Journal 29 (12), 141-157.

      [10] Amalendu, S. (2009) Hopf Bifurcation in the Wake of a Square Cylinder. Physics of Fluids 21(3), 105-124.

      [11] Amalendu, S. (2010) Hopf Bifurcation in Bluff Body Wakes. The 5th International Symposium on Computational Wind Engineering, Chapel Hill, North Carolina, USA.

      [12] Dipankar, C., Gautam, B. and Sakir, A. (2010), Numerical Simulation of Flow Past Row of Square Cylinders for Various Separation Ratios. Computers and Fluids 39(1), 49-59.

      [13] Dipankar, C., Gautam B, Sakir A. (2012), Mixed Convection Heat Transfer from an In-Line Row of Square Cylinders in Cross-Flow at Low Reynolds Number. Numerical Heat Transfer, Part A: Application 61(12), 891-911.

      [14] Dipankar, C., Bittagopal, M. (2013), Effect of thermal buoyancy on vortex shedding behind a square cylinder in cross flow at low Reynolds numbers. International Journal of Heat and Mass Transfer 54(25-26), 5262-5274.

      [15] Dejong, N.C., Zhang, L.W., Jacobi, A.M., Balachandar, S. and Tafti, D.K. (2010) A Complementary Experimental and Numerical Study of Flow and Heat Transfer in Offset Strip-Fin Heat Exchangers. Journal of Heat Transfer 120, 690-698.

      [16] Harun, Z., Reda, E. and Abdullah, S. (2015), Large Eddy Simulation of the Wind Flow over Skyscrapers, Recent Advances in Mechanics and Mechanical Engineering, 72-79.

      [17] Sohankar, A. and Etminan, A. (2009) Forced-Convection Heat Transfer from Tandem Square Cylinders in Cross Flow at Low Reynolds Numbers. International Journal for Numerical Methods in Fluids 60, 733-751.

      [18] Sohankar, A., Norberg, C. and Davidson, L. (1998) Low-Reynolds-Number Flow Around a Square Cylinder at Incidence: Study of Blockage, Onset of Vortex Shedding and Outlet Boundary Condition. International Journal for Numerical Methods in Fluids 26, 39-56.

      [19] Etminan, A., Moosavi, M. and Ghaedsharafi, N. (2011), Determination of Flow Configurations and Fluid Forces Acting on two Tandem Square Cylinders in Cross Flow and its Wake Patterns. International Journal of Mechanics 5, 63-74.

      [20] Etminan, A. and Barzegar, A. (2012) Instantaneous and Time-Averaged Flow Structure around two Heated Square Cylinders in the Laminar Flow Regime. Applied Mechanics and Materials Journal 110-116: 2898-2902.

      [21] Etminan, A. (2013) Flow and Heat Transfer over two Bluff Bodies from Very Low to High Reynolds Numbers in the Laminar and Turbulent Flow Regimes. International Journal of Advanced Design and Manufacturing Technology 2(6), 61-72.

      [22] Kelkar, K.M.K.M. and Patankar, S.V. (1992), Numerical Prediction of Vortex Shedding behind a Square Cylinder," International Journal of Numerical Methods in Fluids 14, 327-341.

      [23] Sohankar, A., Norberg, C. and Davidson, L. (1997) Numerical Simulation of Unsteady Low- Reynolds Number Flow around Rectangular Cylinders at Incidence. Journal of Wind Engineering and Industrial Aerodynamics 69, 189-201.

      [24] Shimizu, Y. and Tanida, Y. (1978), Fluid Forces Acting on Cylinders of Rectangular Cross Section. Transactions of the Japan Society of Mechanical Engineering 44, 2699-

  • Downloads

  • How to Cite

    Etminan, A., Sharifian, A., Reda, E., & Harun, Z. (2018). Time-Averaged Heat Transfer and Vortex Shedding of a Singular and Twin Heated Bluff Bodies in Cross Flow. International Journal of Engineering & Technology, 7(3.17), 270-276. https://doi.org/10.14419/ijet.v7i3.17.25251