This work presents a numerical investigation on heat transfer and fluid-dynamic 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 average 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 cavity is maximum when the inclination angle is zero even at higher values of Rayleigh 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 average Nusselt number as a function of Rayleigh number, opening ratio and inclination angle.
Bibliographical noteJournals published by TSP are fully open access: research articles, reviews or any other content on this platform is available to everyone free of charge. TSP defines Open Access by the followings: peer-reviewed literature is freely available without subscription or price barriers, literature is immediately released in Open Access format (no embargo period), and published material can be re-used without obtaining permission as long as a correct citation to the original publication is given TSP journals publish articles under the Creative Commons Attribution License and are using the CC BY license.
Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.
- Natural convection
- Finite-volume method
- Average Nusselt number
- Solar cavity
- Rayleigh number