The present work aims to investigate the heat transfer characteristics of heated cylindrical pins within an air-filled rectangular enclosure experimentally in a natural convection dominated regime. The experiments are performed to analyze the effects of fin spacing (25 mm ≤ S ≤ 100 mm) and Rayleigh number (248,659 ≤ Ra ≤ 578,395) as key factors at constant pin height (l = 25 mm) and pin diameter (d = 10 mm) values. The results confirm the existence of optimum fin spacing providing maximum heat transfer enhancement. The investigation is extended further to quantify the effects of the presence of cylindrical porous pins with the uniform diameter (d_p = 15 mm), pin length (l_p = 20 mm) and calculated porosity of 19.3% by volume on the thermal performance of the system. The results reveal the improved system performance due to the presence of a porous medium for all tested system configurations. Some new empirical correlations predicting system performance are also proposed those demonstrate the satisfactory qualitative behavior of system performance.

本工作的目的是在自然对流占主导地位的实验中研究充气矩形外壳内加热的圆柱销的传热特性。该实验以分析翅片间距的影响（25毫米≤ 小号 ≤100mm）上和瑞利数（248659≤ 太阳神 ≤578395），其在恒定的销高度（关键因素升 = 25毫米），针直径（d  = 10 （mm）值。结果证实了最佳翅片间距的存在，可以最大程度地提高热传递。进一步扩展了研究以量化具有均匀直径（d _p  = 15 mm），针长（l_p  = 20 mm），计算得出的系统孔隙率按体积计为19.3％。结果表明，由于存在用于所有测试系统配置的多孔介质，因此系统性能得到了改善。还提出了一些新的经验相关性来预测系统性能，这些相关性证明了系统性能令人满意的定性行为。