Natural Convection Heat Transfer in Partially Divided Vertical Enclosures with Adiabatic End Walls.

Shalaby, Mohamed Ali Ibrahim; Shaheen, A. S.; El-Sedeek, A.

doi:10.21608/bfemu.2021.166351

Natural Convection Heat Transfer in Partially Divided Vertical Enclosures with Adiabatic End Walls.

Document Type : Research Studies

Authors

¹ Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansourra., Egypt.

² Physical Science Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

10.21608/bfemu.2021.166351

Abstract

A numerical study has been carried on natural convection, which occurs in building enclosures, with perfectly adiabatic horizontal end wails and finitely adiabatic baffles extending from the ceiling of the enclosures. The results have been obtained for the air-filled (Pr = 0.71) and for water-filled (Pr = 3.7) enclosures with isothermal hot and cold walls. The flow is considered to be two dimensional, laminar and steady. During the couse of this work Rayleigh number has a value varies between 10⁴ to 10⁷ and the aspect ratio of the enclosure has two values (A = 1 and 1/2), and the aperture ratio has three value (A_{p < /sub>}= 3/4, 1/2 and 1/4). The effect of the aspect ratio and the effect of the aperture ratio on the heat transfer and the natural convection flow are discussed. Allow Rayleigh separation bubble increases while the strength of the main flow decreases with the decrease of the aperture ratio. The average Nusselt number for the enclosure is significantly smallar in the presence of the baffles.

Main Subjects