In this study, splayed effects on the thermal performance of standard cross-cut heat sink (S–CCHS), fixed-array splayed (FAS-CCHS), and full splayed (FS–CCHS) under natural and forced conditions are studied experimentally and numerically. For this purpose, variable parameters such as splayed ratio, different powers of LEDs, natural and forced conditions, and blowing direction have been studied. The results showed that the thermal performance is significantly impacted by the spread position of the fins, blowing direction, natural and forced conditions of the CCHS but is not very sensitive to LEDs' powers. The results show that the full splayed heat sink occupies the highest physical volume, thus, provides the highest thermal performance by efficiently dissipating heat compared to other heat sinks designs. Experimental and numerical results show that the full splayed effect provides 5.46% and 2.59% lower junction temperature in natural and forced, respectively. Also, FS-CCHS achieved a 7.09% reduction in thermal resistance at natural convection 3 W and a 2.62% reduction at 10 W, respectively, compared to the flat fins and the fixed array wide fin heat sink. For this study, while the most suitable flow direction was determined as push, the most suitable orientation was found to be upward, and the splayed impact was also beneficial.

在本研究中，通过实验研究了标准横切散热器 (S-CCHS)、固定阵列张开 (FAS-CCHS) 和全张开 (FS-CCHS) 在自然和强制条件下对热性能的影响，并数字上。为此，研究了诸如张开比、LED 的不同功率、自然和受迫条件以及吹风方向等可变参数。结果表明，散热性能受散热片的展开位置、吹风方向、CCHS 的自然和受迫条件的显着影响，但对 LED 的功率不是很敏感。结果表明，全张开的散热器占据最高的物理体积，因此与其他散热器设计相比，通过有效散热来提供最高的热性能。实验和数值结果表明，在自然和强制下，全张开效应分别使结温降低了 5.46% 和 2.59%。此外，与扁平鳍片和固定阵列宽鳍片散热器相比，FS-CCHS 在自然对流 3 W 下的热阻分别降低了 7.09%，在 10 W 下实现了 2.62% 的降低。在这项研究中，虽然最合适的流动方向被确定为推动，但发现最合适的方向是向上，而且张开的冲击也是有益的。