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Effect of Aspect Ratio on Natural Convection in a Cavity with Wavy Walls

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Arici M., Kan M., Karabay H.
Acta Physica Polonica A
|
2015
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vol. 128
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issue 2B
B-197-B-200
EN
In this study, flow characteristics and natural convection in a cavity with two wavy walls is studied numerically. The wavy walls of the cavity are isothermal and at different temperatures while other straight walls are adiabatic. The fluid considered inside the cavity is air having Prandtl number of 0.71. A parametric study is conducted for various aspect ratios (1 ≤ AR ≤ 5), Rayleigh numbers (10³ ≤ Ra_{H} ≤ 10⁶) and inclination angles (0° ≤ θ ≤ 180°). Streamlines, isotherms and local and mean Nusselt numbers are presented to show the effect of the investigated parameters on the flow field and heat transfer.
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Investigation of Heat Insulation Performance of Hollow Clay Bricks Filled with Perlite

100%
Arıcı M., Yılmaz B., Karabay H.
Acta Physica Polonica A
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2016
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vol. 130
|
issue 1
266-268
EN
In this study, the possibility of enhancing heat insulation performance of hollow bricks by filling the cavities with perlite is investigated. A conjugate heat transfer by conduction, convection and radiation in different hollow bricks are analyzed numerically to assess their thermal performance. Calculations are performed for three scenarios for each type of hollow brick: (i) cavities are filled with air, (ii) half of the cavities are filled with perlite while the other half is filled with air, (iii) all cavities are filled with perlite. The benefit of filling cavities with perlite is justified quantitatively for each investigated hollow brick type. It is concluded that the enhancement in insulation performance can be up to 15.6% and 27.5% for half-perlite and full-perlite cases, respectively, depending on the brick type.
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