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This study aims to design a bank of tube heat exchangers (BOTHE) in the form of a set of tubes immersed in a porous medium (BOTHE) to achieve the highest heat transfer density within natural convection. It is assumed that the air movement is two-dimensional and incompressible. The governing equations are solved numerically using the finite volume method (FVM) with the aid of a commercial CFD package (ANSYS 2022/R2). The range of the cylinder's diameter is D − CY(10, 12.7, 19.05, 25.4, 31.74) mm, while the porosity range is P = 0.36, 0.42, 0.5, 0.36 and 0.72), the diameter of the porous material being (DP = 26 mm), the distance between the tubes is(ST = 60 mm), and the thermal conductivity of (K = 5.84 W/m.C). The Rayleigh numbers ranged from (25*10^9 to 100*10^9.) After analyzing the graphical data, the results indicated that the highest heat flux value was (7422 W/m^2), corresponding to a Rayleigh number of 100*10^9, with a heating element diameter of 10 mm, an improvement of 70%. This analysis revealed that the use of the heating element diameter and porous media plays a significant role in enhancing the performance of BOTHE.

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Natural Convection Heat Transfer Through a Solar Heater Saturated with a Porous Medium

  • 会议论文

  • 发表日期：

    2026年

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  • Omar A. Saleh,
  • Ahmed Hasan Ahmed

摘要

This study aims to design a bank of tube heat exchangers (BOTHE) in the form of a set of tubes immersed in a porous medium (BOTHE) to achieve the highest heat transfer density within natural convection. It is assumed that the air movement is two-dimensional and incompressible. The governing equations are solved numerically using the finite volume method (FVM) with the aid of a commercial CFD package (ANSYS 2022/R2). The range of the cylinder's diameter is D − CY(10, 12.7, 19.05, 25.4, 31.74) mm, while the porosity range is P = 0.36, 0.42, 0.5, 0.36 and 0.72), the diameter of the porous material being (DP = 26 mm), the distance between the tubes is(ST = 60 mm), and the thermal conductivity of (K = 5.84 W/m.C). The Rayleigh numbers ranged from (25*10^9 to 100*10^9.) After analyzing the graphical data, the results indicated that the highest heat flux value was (7422 W/m^2), corresponding to a Rayleigh number of 100*10^9, with a heating element diameter of 10 mm, an improvement of 70%. This analysis revealed that the use of the heating element diameter and porous media plays a significant role in enhancing the performance of BOTHE.