INDIAN JOURNAL OF SCIENCE AND TECHNOLOGY RESEARECH ARTICLE OPEN ACCESS Received: 14.09.2021 Accepted: 03.12.2021 Published: 27.12.2021 Citation: Moctar M, Ky TSM, Konfé A, Dianda B, Ouédraogo S, Bathiébo DJ (2021) Natural Convection Modeling in a Solar Tower. Indian Journal of Science and Technology 14(48): 3475-3493. https://doi.org/ 10.17485/IJST/v14i48.1357 ∗ Corresponding author. ousmane.m2001@gmail.com Funding: None Competing Interests: None Copyright: © 2021 Moctar et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Published By Indian Society for Education and Environment (iSee) ISSN Print: 0974-6846 Electronic: 0974-5645 Natural Convection Modeling in a Solar Tower Moctar Moctar 1∗ , Thierry Sikoudouin Maurice Ky 2 , Amadou Konfé 2 , Boureima Dianda 3 , Salifou Ouédraogo 2 , Dieudonné Joseph Bathiébo 2 1 University of Agadez, PO BOX 199, Niger 2 Laboratory L.E.T.R.E, University Joseph KIZERBO, PO BOX 7021, Ouagadougou 03, Burkina Faso 3 Institute of Research in Applied Science and Technologies, Ouagadougou 03, PO Box 7047, Burkina Faso Abstract Objectives: We present in this study a modeling of thermal laminar convection airflow in a solar tower. Methods: To formulate with precision, the boundary conditions of the solar chimney model chosen, the Cartesian equations are transformed into hyperbolic coordinates. An orthogonal grid is elaborated. It then makes it possible to draw up the diagrams of physique and calculation fields. The computer code uses the heat equation, the vorticity, and the stream function formalism as the boundary conditions for pressure are difficult to set. We use the Boussinesq approximation, which consists in considering that the density (ρ ) of the fluid varies only in the term of the gravity forces, whose variations with temperature, assumed to be linear, generate natural convec- tion. These variations are then translated into an equation of state which relates density to temperature. The system of dimensionless equations is solved by using an intégro-interpolation method referring to finite differences scheme. Findings: The solutions obtained from the dimensionless equations enabled us to determine the space evolution parameters (temperatures and velocities) in the tower according to the Rayleigh number. The fluid temper- ature and velocity evolution in the collector increase when one moves in the direction of radius decrease. The fluid temperature evolution in the chimney showed that the highest temperature is located at the chimney base while we obtained a parabolic profile of the transverse temperature distribution within the chimney. Finally, the evolution of the fluid velocity in the chimney showed that there was a preferred zone for turbine installation. Novelty : The use of dimensionless geometric parameters is unique and in general, the approach adopted in this paper differs from that encountered in the literature. 1 Introduction Nowadays, the development level of each nation is measured by the rate of access to electricity and its consumption per capita. In our countries, the energy crisis, the deterioration of the environment, and the decline in agricultural yields have negative consequences on the quality of life. Te population growth and development needs have led to an increase in the consumption of traditional energy resources. Indeed, in https://www.indjst.org/ 3475