Numerical Study of Natural Convection in Square Tilted Solar Cavity Considering Extended Domain
No Thumbnail Available
Date
2018
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
This work presents a numerical investigation on heat transfer and fluiddynamic aspects for a solar open cavities in an extended fluid flow domain. The vertical
wall inside the open cavities facing the aperture is assumed to be isothermal while the
other walls are kept insulated. Heat transfer steady laminar natural convection is studied
by solving the non-dimensional governing equations of mass, momentum and energy in
the framework of a finite volume method. The analysis are carried out under Rayleigh
number range of 9.41×105 to 3.76×106, inclination 0° to 90° and opening ratio 0.25, 0.5
and 1. The model results for avaergar Nusselt number evaluation was in good agreement
with other published work for similar configuration. The results show that convective
average Nusselt number decreases by 93% when the inclination angle increased from 0°
to 90°due to the trapped vortices that limit the airflow throughout the cavity. The air
flowing through the cavit is maximum when the the inclination angle is zero even at
higher values of Raylight number. Results show also that decreasing the opening ratio
from 1 to 0.25 leads to a drop in heat loss by 22.79%. A simple correlation has been
developed for calculating the the average Nusselt number as a function of Rayleigh
number, opening ratio and inclination angle.