Metallurgical and Materials Transactions B

, Volume 37, Issue 4, pp 565–570 | Cite as

Heat-transfer enhancement using weakly ionized, atmospheric pressure plasma in metallurgical applications

  • V. Rajamani
  • R. Anand
  • G. S. Reddy
  • J. A. Sekhar
  • M. A. Jog
Article

Abstract

Experimental measurements and computational analysis of heat transfer in atmospheric pressure, midtemperature range (1200 to 1600 K) plasma flow over an aluminum cylinder have been carried out. A comparison of transient temperature measurements for the aluminum cylinder under convective unionized air flow and those with convective plasma flow shows significantly higher heat transfer from plasma flow compared to air flow under identical temperature and flow conditions. A heattransfer problem is computationally modeled by using available experimental measurements of temperature rise in the cylinder to determine the degree of ionization in the plasma flow. The continuity, momentum, and energy conservation equations, as well as conservation equations for electrons and ions, and the Poisson’s equation for self-consistent electric field are solved in the plasma by a finite volume method. The conjugated transient heat transfer in the cylinder and in the plasma is obtained by simultaneous solution of the transient energy conservation equations. It is shown that the enhancement of heat transfer in plasma flow is due to the energy deposited by charged species during recombination reaction at the solid surface. An important finding is that even a small degree of ionization (<1 pct) provides significant enhancement in heat transfer. This enhancement in heat transfer can lead to a productivity increase in metallurgical applications.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    R.W. Smith, D. Wei, and D. Apelian: Plasma Chem. Plasma Processing, 1989, vol. 9, pp. 135–65.CrossRefGoogle Scholar
  2. 2.
    P.S. Ayyaswamy and I.M. Cohen: Annual Review of Heat Transfer—Vol. 12, Hemisphere Publishing, New York, NY, 2002, pp. 27–78.Google Scholar
  3. 3.
    M.I. Boulos, P. Fauchais, and E. Pfender: Thermal Plasmas: Fundamentals and Applications, Plenum Press, New York, NY, 1994, vol. 1, pp. 22–43.Google Scholar
  4. 4.
    S.R. Sheshadri: Fundamentals of Plasma Physics, Elsevier Publishing, New York, NY, 1973, pp. 76–83.Google Scholar
  5. 5.
    M.A. Hader and M.A. Jog: Phys. Plasmas, 1998, vol. 5, pp. 902–09.CrossRefGoogle Scholar
  6. 6.
    M.A. Jog and L. Huang: J. Heat Transfer, 1996, vol. 118, pp. 471–77.Google Scholar
  7. 7.
    Y.P. Chyou and E. Pfender: Plasma Chem. Plasma Proc., 1989, vol. 9, pp. 45–71.CrossRefGoogle Scholar
  8. 8.
    E. Laveroni and E. Pfender: Int. J. Heat Mass Transfer, 1990, vol. 33, pp. 1497–509.CrossRefGoogle Scholar
  9. 9.
    R.M. Young and E. Pfender: Plasma Chem. Plasma Proc., 1987, vol. 7, pp. 211–26.CrossRefGoogle Scholar
  10. 10.
    P. Proulx, J. Mostaghimi, and M. Boulos: Int. J. Heat Mass Transfer, 1985, vol. 28 (7), pp. 1327–36.CrossRefGoogle Scholar
  11. 11.
    X. Chen: J. Phys. D: Appl. Phys., 1997, vol. 30, pp. 1885–92.CrossRefGoogle Scholar
  12. 12.
    A.G. Gnedovets and A.A. Uglov: Plasma Chem. Plasma Proc., 1992, vol. 12, pp. 383–401.CrossRefGoogle Scholar
  13. 13.
    P.M. Chung, L. Talbot, and K.J. Touryan: Electric Probes in Stationary and Flowing Plasmas: Theory and Applications, Spinger, Berlin, 1975, pp. 39–78.Google Scholar
  14. 14.
    S.V. Patankar: Numerical Heat Transfer and Fluid Flow, Hemisphere Publishing, New York, NY, 1980, pp. 79–131.Google Scholar
  15. 15.
    S.C. Brown: Basic Data of Plasma Physics, MIT Press, Cambridge, MA, 1966, pp. 88–89.Google Scholar

Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2006

Authors and Affiliations

  • V. Rajamani
    • 1
  • R. Anand
    • 2
  • G. S. Reddy
    • 3
  • J. A. Sekhar
    • 4
  • M. A. Jog
    • 5
  1. 1.the Department of Mechanical EngineeringUniversity of Cincinnati, is Research Engineer, Saint Gobain R&D CentreNorthborough
  2. 2.Department of Mechanical EngineeringUniversity of Cincinnati, is Design Engineer, Caterpillar CorporationPeoria
  3. 3.M.H.I. Inc.Cincinnati
  4. 4.Department of Chemical and Materials Engineeringthe University of Cincinnati
  5. 5.Mechanical Engineering, Department of Mechanical Engineeringthe University of Cincinnati

Personalised recommendations