Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
A NUMERICAL STUDY OF THE SIMULTANEOUS NATURAL CONVECTIVE HEAT TRANSFER FROM THE TOP AND BOTTOM SURFACES OF A THIN HORIZONTAL PLATE HAVING A TRAPEZOIDAL WAVY SURFACE
Submission Author:
Santiago del Rio Oliveira , SP
Co-Authors:
Santiago del Rio Oliveira, Mario Cesar Ito, Vicente Luiz Scalon
Presenter: Santiago del Rio Oliveira
doi://10.26678/ABCM.COBEM2019.COB2019-0234
Abstract
A numerical study of natural convective heat transfer from a thin, two-sided, two-dimensional horizontal plate having a uniform surface temperature has been undertaken. The surface shape is wavy, and attention has been given to the case where the surface waves have a trapezoidal shape with a constant height. The temperature of the top and bottom plate surfaces, which are the same, is higher than the temperature of the surrounding fluid. Here, the conditions considered are such that laminar flow, transitional flow, and turbulent flow can occur over the plate. The flow around the entire plate has been considered and the heat transfer from both the top and bottom surfaces of the plate have been studied. The flow has been assumed to be two-dimensional and steady and the Boussinesq approach has been adopted. The k¬-epsilon turbulence model has been used with full account being taken of buoyancy force effects. The commercial CFD solver ANSYS FLUENT© has been used to obtain the solution. The mean heat transfer rates from the top and bottom surfaces of the plate and averaged over both surfaces of the plate has been expressed in terms of Nusselt numbers based on the plate width. Results have been obtained only for a Prandtl number of 0.71, i.e., essentially the value for air. Results for a wide range of dimensionless surface wave heights and ratio between larger base and minor base have been obtained.
Keywords
natural convective heat transfer, wavy surface, trapezoidal waves, Heat transfer enhancement
