ISSN Online: 2377-424X
ISBN Print: 978-1-56700-474-8
ISBN Online: 978-1-56700-473-1
International Heat Transfer Conference 16
NUMERICAL STUDY OF 3D TURBULENT FLOW AND LOCAL HEAT TRANSFER NEAR A CYLINDER INTRODUCED INTO THE FREE-CONVECTION BOUNDARY LAYER ON A VERTICAL PLATE
Sinopsis
The contribution covers results of RANS-based numerical simulation of 3D buoyancy-controlled flow and local heat transfer in the vicinity of a long circular adiabatic cylinder normally inserted into the free-convection turbulent boundary layer developing along an isothermal vertical plate. The k-ω SST model is used for turbulence modeling. Computations are performed using a finite-volume second-order accuracy ANSYS Fluent code with grids of different resolution. Assuming flow symmetry with respect to the middle plane, steady-state
solutions have been obtained for different ratio of the cylinder diameter to a characteristic thickness of the
approaching boundary layer. The structure of the flow field and local heat transfer characteristics of the disturbed
boundary layer are analyzed. It has been established that the flow field predicted contains near-wall (inner) horseshoe vortex developing in the cylinder-plate junction. Another (outer) horseshoe vortex forms above the boundary layer facing the cylinder that is an interesting peculiarity of the flow configuration under study. Data of parametric computations discovering the influence of the cylinder diameter on dimensions of the occurring horseshoe vortices and heat transfer augmentation are presented.