Forced Convection Heat Transfer from a Finite-Height Cylinder
- 273 Downloads
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.
KeywordsLarge-eddy simulation Heat transfer Forced convection Finite-height cylinder
Unable to display preview. Download preview PDF.
- 6.Denev, J.A., Fröhlich, J., Bockhorn, H.: Large eddy simulation of a swirling transverse jet into a crossflow with investigation of scalar transport. Phys. Fluids 21, 015101 (2009)Google Scholar
- 15.Hinterberger, C.: Dreidimensionale und tiefengemittelte Large-eddy-simulation von flachwasserströmungen. University of Karlsruhe (2004). Ph.D. thesisGoogle Scholar
- 16.Hölscher, N., Niemann, H.J.: Some aspects about the flow around a surface-mounted circular cylinder in a turbulent shear flow. In: Proceedings of 6th Symp. Int. Turbulent Shear Flows, ToulouseGoogle Scholar
- 24.Pierce, C.: Progress-variable approach for large-eddy simulation of turbulent combustion. Stanford University (2001). Ph.D. thesisGoogle Scholar