Rashid Farhan Lafta, Hussein Ahmed Kadhim, Malekshah Emad Hasani, Abderrahmane Aissa, Guedri Kamel, Younis Obai
Petroleum Engineering Department, College of Engineering, University of Kerbala, Karbala 56001, Iraq.
Mechanical Engineering Department, College of Engineering, University of Babylon, Babylon City 51002, Iraq.
Nanomaterials (Basel). 2022 Jul 19;12(14):2481. doi: 10.3390/nano12142481.
Many strategies have been attempted for accomplishing the needed changes in the heat-transfer rate in closed cavities in recent years. Some strategies used include the addition of flexible or hard partitions to the cavities (to split them into various pieces), thickening the borders, providing fins to the cavities, or altering the forms or cavity angles. Each of these methods may be used to increase or decrease heat transmission. Many computational and experimental investigations of heat transport in various cavity shapes have been conducted. The majority of studies focused on improving the thermal efficiency of heat transmission in various cavity containers. This paper introduced a review of experimental, numerical, and analytical studies related to heat transfer analyses in different geometries, such as circular, cylindrical, hexagonal, and rectangular cavities. Results of the evaluated studies indicate that the fin design increased heat transmission and sped up the melting time of the PCM; the optimal wind incidence angle for the maximum loss of combined convective heat depends on the tilt angle of the cavity and wind speed. The Nusselt number graphs behave differently when decreasing the Richardson number. Comparatively, the natural heat transfer process dominates at Ri = 10, but lid motion is absent at Ri = 1. For a given Ri and Pr, the cavity without a block performed better than the cavity with a square or circular block. The heat transfer coefficient at the heating sources has been established as a performance indicator. Hot source fins improve heat transmission and reduce gallium melting time.
近年来，人们尝试了许多策略来实现封闭腔内传热速率所需的变化。所采用的一些策略包括在腔内添加柔性或刚性隔板（将其分成不同部分）、加厚边界、给腔内设置翅片，或改变形状或腔角。这些方法中的每一种都可用于增加或减少热传递。已经对各种腔形状中的热传输进行了许多计算和实验研究。大多数研究集中在提高各种腔容器内热传递的热效率。本文介绍了对与不同几何形状（如圆形、圆柱形、六边形和矩形腔）内热传递分析相关的实验、数值和分析研究的综述。评估研究的结果表明，翅片设计增加了热传递并加快了相变材料的熔化时间；组合对流热损失最大时的最佳风入射角取决于腔的倾斜角度和风速。当降低理查森数时，努塞尔数图的表现有所不同。相比之下，在Ri = 10时自然传热过程占主导，但在Ri = 1时不存在盖子运动。对于给定的Ri和Pr，没有障碍物的腔比有方形或圆形障碍物的腔表现更好。加热源处的传热系数已被确定为一个性能指标。热源翅片可改善热传递并减少镓的熔化时间。
