The suppression of thermal exchange intensity by incorporating geometric rectifications into closed enclosures has gainedattentions more and more, owing to its superior advantages in thermal applications. This study is oriented around the influence ofthe position of flat adiabatic septa placed between the isotherm surfaces inside a vertical closed enclosure, on the buoyancy-inducedconvection 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 isothermsurfaces inside the enclosure is investigated both experimentally and numerically. Indeed, it is specified that, which position for therow of septa leads to the minimum thermal exchange intensity between the isotherm surfaces i.e. closer to the warm surface, closerto the cold surface or placement at the middle of the enclosure. Then, optimized values of a set of parameters including the Rayleighnumber (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 criticalvalue 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 thermalexchange intensity.
