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Forced Convection Heat Transfer from a Finite-Height Cylinder

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Abstract

This paper presents a large eddy simulation of forced convection heat transfer in the flow around a surface-mounted finite-height circular cylinder. The study was carried out for a cylinder with height-to-diameter ratio of 2.5, a Reynolds number based on the cylinder diameter of 44 000 and a Prandtl number of 1. Only the surface of the cylinder is heated while the bottom wall and the inflow are kept at a lower fixed temperature. The approach flow boundary layer had a thickness of about 10% of the cylinder height. Local and averaged heat transfer coefficients are presented. The heat transfer coefficient is strongly affected by the free-end of the cylinder. As a result of the flow over the top being downwashed behind the cylinder, a vortex-shedding process does not occur in the upper part, leading to a lower value of the local heat transfer coefficient in that region. In the lower region, vortex-shedding takes place leading to higher values of the local heat transfer coefficient. The circumferentially averaged heat transfer coefficient is 20 % higher near the ground than near the top of the cylinder. The spreading and dilution of the mean temperature field in the wake of the cylinder are also discussed.

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Authors and Affiliations

  1. Bioingeniería e Ing. Aeroespacial, Univ. Carlos III de Madrid, Leganés, Spain

    Manuel García-Villalba

  2. Departament d’Enginyeria Rural i Agroalimentària,, Universitat Politècnica de València, Valencia, Spain

    Guillermo Palau-Salvador

  3. Inst. Hydromechanics, Karlsruhe Inst. of Technology, Karlsruhe, Germany

    Wolfgang Rodi

  4. King Abdulaziz University, Jeddah, Saudi Arabia

    Wolfgang Rodi

Authors
  1. Manuel García-Villalba
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  2. Guillermo Palau-Salvador
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  3. Wolfgang Rodi
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Correspondence to Manuel García-Villalba.

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García-Villalba, M., Palau-Salvador, G. & Rodi, W. Forced Convection Heat Transfer from a Finite-Height Cylinder. Flow Turbulence Combust 93, 171–187 (2014). https://doi.org/10.1007/s10494-014-9543-7

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  • DOI: https://doi.org/10.1007/s10494-014-9543-7

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