Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

A Numerical Study on the Impinging Jet Flow Characteristics in the Presence of Applied Magnetic Fields

자기장이 인가된 충돌제트의 유동 특성에 관한 수치적 연구

  • 이현구 (LG전자 에어컨 연구소) ;
  • 윤현식 (부산대학교 첨단조선공학연구센터) ;
  • 홍승도 (부산대학교 대학원 기계공학과) ;
  • 하만영 (부산대학교 기계공학부)
  • Published : 2005.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

The present study numerically investigates two-dimensional fluid flow in the confined jet flow in the presence of applied magnetic field. Numerical simulations to calculate the fluid flow and heat transfer in the confined jet are performed for different Reynolds numbers in the absence and presence of magnetic fields in the range of $0{\le}N{\le}0.05$, where N is the Stuart number (interaction parameter) which is the ratio of electromagnetic force to inertia force. The present study reports the detailed information of flow in the channel at different Stuart numbers. As the intensity of applied magnetic fields increases, the vortex shedding formed in the channel becomes weaker and the oscillating amplitude of impinging jet decreases. The flow fields become the steady state if the Stuart number is greater than a critical value. Thus the pressure coefficients at the stagnation point also vary as a function of Stuart number.

Keywords

References

  1. Sparrow, E.M. and Wong, T.C., 1975, 'Impingement Transfer Coefficients Due to Initially Laminar Slot Jets,' Int. J. Heat Mass Transfer, Vol. 18, pp. 597-605 https://doi.org/10.1016/0017-9310(75)90271-9
  2. Bouainnouche, M., Bourabaa, N. and Desmet, B., 1997, 'Numerical Study of the Wall Shear Stress Produced by the Impingement of a Plane Turbulent Jet on a Plate,' Int. J. Numerical Method for Heat & Fluid Flow, Vol. 7, pp. 548-564 https://doi.org/10.1108/09615539710367297
  3. Chen, M., Chalupa, R., West, A.C. and Modi, V., 2000, 'High Schmidt Mass Transfer in a Laminar Impinging Slot Jet Flow,' Int. J. Heat Mass Transfer, Vol. 43, pp. 3907-3915 https://doi.org/10.1016/S0017-9310(00)00052-1
  4. Beitelmal, A.H., Saad, M.A. and Patel, C.D., 2000, 'The Effect of Inclination on the Heat Transfer Between a Flat Surface and an Impinging Two-Dimensional Air Jet,' Int. J. Heat & Fluid Flow, Vol. 21, pp. 156-163 https://doi.org/10.1016/S0142-727X(99)00080-6
  5. Phares, D.J., Smedley, G.T. and Flagan, R.C., 2000, 'The Wall Shear Stress Produced by the Normal Impingment of a Jet on a Flat Surface,' J. Fluid Mech., Vol. 418, pp. 351-375 https://doi.org/10.1017/S002211200000121X
  6. Chattopadhyay, H. and Saha, S.K., 2001, 'Numerical Investigation of Heat Transfer over a Moving Surface due to Impinging Knife-Jets,' Numerical Heat Transfer, Part A, Vol. 39, pp. 531-549 https://doi.org/10.1080/104077801750111629
  7. Hwang, S. D., Lee, C. H. and Cho, H. H., 2001, 'Heat Transfer and Flow Structures in Axisymmetric Impinging Jet Controlled by Vortex Pairing,' Int. J. of Heat and Fluid Flow, Vol. 22, pp. 293-300 https://doi.org/10.1016/S0142-727X(01)00091-1
  8. Choo, Y. and Kang, B., 2002, 'The Velocity Distribution of the Liquid Sheet Formed by Two Low-Speed Impinging Jets,' Phys. Fluids, Vol. 14, No. 2, pp. 622-627 https://doi.org/10.1063/1.1429250
  9. Aldabbagh, L.B.Y. and Sezai, I., 2002, 'Numerical Simulation of Three-Dimensional Laminar Multiple Impinging Square Jets,' Int. J. Heat Fluid Flow, Vol. 23, pp. 509-518 https://doi.org/10.1016/S0142-727X(02)00141-8
  10. Chiriac, V.C. and Ortega, A., 2002, 'A Numerical Study of the Unsteady Flow and Heat Transfer in a Transitional Confined Slot Jet Impinging on an Isothermal Surface,' Int. J. Heat Mass Transfer, Vol. 45, pp. 1237-1248 https://doi.org/10.1016/S0017-9310(01)00224-1
  11. Chung, Y.M., Luo, K.H. and Sandham, N.D., 2002, 'Numerical Study of Momentum and Heat Transfer in Unsteady Impinging Jets,' Int. J. Heat Fluid Flow, Vol. 23, pp. 592-600 https://doi.org/10.1016/S0142-727X(02)00155-8
  12. Beaubert, F. and Viazzo, S., 2003, 'Large Eddy Simulation of Plane Turbulent Impinging Jets at Moderate Reynolds Numbers,' Int. J. Heat Fluid Flow, Vol. 24, pp. 512-519 https://doi.org/10.1016/S0142-727X(03)00045-6
  13. Chattopadhay, H. and Saha, S.K., 2003, 'Turbulent Flow and Heat Transfer from a Slot Jet Impinging on a Moving Plate,' Int. J. Heat and Fluid Flow, Vol. 24, pp. 685-697 https://doi.org/10.1016/S0142-727X(03)00062-6
  14. Ha, M.Y., Lee, H.G. and Seong, S.H., 2003, 'Numerical Simulation of Three-Dimensional Flow, Heat Transfer and Solidification of Steel in Continuous Casting Mold with Electromagnetic Brake,' J. Material Processing Tech. Vol. 133, pp. 322-339 https://doi.org/10.1016/S0924-0136(02)01009-9
  15. Muck, B., Gunther, C., Muller, U. and Buhler, L., 2000, 'Three-Dimensional MHD Flows in Rectangular Ducts with Internal Obstacles,' J. Fluid Mech. Vol. 418, pp. 265-295 https://doi.org/10.1017/S0022112000001300
  16. Yoon, H.S., Chun, H.H., Ha, M.Y. and Lee, H.G., 2004, 'A Numerical Study on the Fluid Flow and Heat Transfer Around a Circular Cylinder in an Aligned Magnetic Fields,' Int. J. Heat Mass Transfer, Vol. 47, pp. 4075-4087 https://doi.org/10.1016/j.ijheatmasstransfer.2004.05.015
  17. Kim, J. and Moin, P., 1985, 'Application of a Fractional Step Method to Incompressible Navier-Stokes Equations,' Journal of Computational Physics, Vol. 59, pp. 308-323 https://doi.org/10.1016/0021-9991(85)90148-2
  18. Pacheco, P.S., 1997, Parallel programming with MPI, Morgan kaufmann Publishers Inc.