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Journal of Mechanical Science and Technology

, Volume 26, Issue 5, pp 1501–1513 | Cite as

Numerical investigation of effects of buoyancy around a heated circular cylinder in parallel and contra flow

  • Armando A. Soares
  • Nuno D. Couto
  • M. Duarte Naia
  • Norberto J. Gonçalves
  • Abel Rouboa
Article

Abstract

Two-dimensional, steady, incompressible Navier-Stokes and energy equations are expressed in the stream function/vorticity formulation and solved numerically by finite difference method to study effects of buoyancy on fluid flow and heat transfer from a horizontal circular cylinder. The cylinder is exposed to approaching flow stream, for parallel (parallel flow) and opposing (contra flow) directions to the buoyant force. Two different thermal boundary conditions were considered at the cylinder surface: constant temperature (CT) and constant heat flux (CHF). The results elucidating the dependence of the flow and heat transfer characteristics on the Richardson number 0≤ Ri ≤ 2, Prandtl number 0 ≤ Pr ≤ 100 and Reynolds number 0 ≤ Re ≤ 40 are presented. Overall, for parallel flow regime, an increase in the Ri led to a raise in both Nusselt number and drag coefficient. However, for contra flow regime, these trends were reversed. For both regimes, the aforementioned behaviors were more pronounced for CT boundary condition than that for the CHF boundary condition.

Keywords

Finite difference Buoyant effects Nusselt number Richardson number Cylinder 

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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Armando A. Soares
    • 1
    • 2
  • Nuno D. Couto
    • 1
    • 2
  • M. Duarte Naia
    • 1
    • 2
    • 3
  • Norberto J. Gonçalves
    • 1
    • 2
    • 4
  • Abel Rouboa
    • 2
    • 5
  1. 1.Escola de Ciências e TecnologiasUniversidade de Trás-os-Montes e Alto DouroVila RealPortugal
  2. 2.CITAB/UTADQuinta de PradosVila RealPortugal
  3. 3.Dep. Eng. Mecânica — Pinhal de MarrocosCEMUC®CoimbraPortugal
  4. 4.GCEPCentro de Física da Universidade do MinhoBragaPortugal
  5. 5.Department of Mechanical Engineering and Applied MechanicsUniversity of PennsylvaniaPhiladelphiaUSA

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