https://doi.org/10.1140/epjp/s13360-024-05861-1
Regular Article
The influence of the position of flat septa placed between isotherm surfaces inside a vertical enclosure on the buoyancy-induced convection current between the surfaces
1
Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran
2
Chemical Engineering Department, Payame Noor University, Tehran, Iran
a
Alimohammad.karami@kut.ac.ir
Received:
2
May
2024
Accepted:
19
November
2024
Published online:
6
December
2024
The suppression of thermal exchange intensity by incorporating geometric rectifications into closed enclosures has gained attentions more and more, owing to its superior advantages in thermal applications. This study is oriented around the influence of the position of flat adiabatic septa placed between the isotherm surfaces inside a vertical closed enclosure, on the buoyancy-induced convection current between the surfaces. The enclosure has two isotherm cold and warm walls whereas, other walls are kept adiabatic. In fact, the influence of the off-center of septa on the steady laminar buoyancy-induced convection current between the isotherm surfaces inside the enclosure is investigated both experimentally and numerically. Indeed, it is specified that, which position for the row of septa leads to the minimum thermal exchange intensity between the isotherm surfaces i.e. closer to the warm surface, closer to the cold surface or placement at the middle of the enclosure. Then, optimized values of a set of parameters including the Rayleigh number (6.5 × 103 ≤ Ra ≤ 1.4 × 104), inclination angle of septa (0° ≤ φ ≤ 180°) together with the off-center of septa (–1.5 mm ≤ S ≤ + 1.5 mm) which results in a minimum thermal exchange intensity, are specified. It was revealed that, except at φ = 0°, a critical value of off-center is observed for the row of septa (Scrit = 0) in which, the thermal exchange intensity reaches it maximum value. At φ = 0°, a reverse behavior is observed. In other words, deviating the septa from the symmetric condition, raises the thermal exchange intensity.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
