Abed Azher M, Mouziraji Hosseinali Ramezani, Bakhshi Jafar, Dulaimi Anmar, Mohammed Hayder I, Ibrahem Raed Khalid, Ben Khedher Nidhal, Yaïci Wahiba, Mahdi Jasim M
Air Conditioning and Refrigeration Techniques Engineering Department, Al-Mustaqbal University College, Babylon, Iraq.
Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran.
Front Chem. 2022 Dec 13;10:1057196. doi: 10.3389/fchem.2022.1057196. eCollection 2022.
This study numerically intends to evaluate the effects of arc-shaped fins on the melting capability of a triplex-tube confinement system filled with phase-change materials (PCMs). In contrast to situations with no fins, where PCM exhibits relatively poor heat response, in this study, the thermal performance is modified using novel arc-shaped fins with various circular angles and orientations compared with traditional rectangular fins. Several inline and staggered layouts are also assessed to maximize the fin's efficacy. The effect of the nearby natural convection is further investigated by adding a fin to the bottom of the heat-storage domain. Additionally, the Reynolds number and temperature of the heat-transfer fluid (HTF) are evaluated. The outcomes showed that the arc-shaped fins could greatly enhance the PCMs' melting rate and the associated heat-storage properties. The melting rate is 17% and 93.1% greater for the case fitted with an inline distribution of the fins with a circular angle of 90° and an upward direction, respectively, than the cases with uniform rectangular fins and no fins, which corresponded to the shorter melting time of 14.5% and 50.4%. For the case with arc-shaped fins with a 90° circular angle, the melting rate increases by 9% using a staggered distribution. Compared to the staggered fin distribution, adding an extra fin to the bottom of the domain indicates adverse effects. The charging time reduces by 5.8% and 9.2% when the Reynolds number (Re) rises from 500 to 1000 and 1500, respectively, while the heat-storage rate increases by 6.3% and 10.3%. When the fluid inlet temperature is 55°C or 50°C, compared with 45°C, the overall charging time increases by 98% and 47%, respectively.
本研究旨在通过数值模拟评估弧形翅片对充满相变材料（PCM）的三管约束系统熔化能力的影响。与无翅片时PCM热响应相对较差的情况不同，在本研究中，与传统矩形翅片相比，使用具有不同圆心角和方向的新型弧形翅片来改善热性能。还评估了几种顺排和错排布局，以最大限度地提高翅片的效能。通过在蓄热区域底部添加翅片，进一步研究了附近自然对流的影响。此外，还评估了传热流体（HTF）的雷诺数和温度。结果表明，弧形翅片可显著提高PCM的熔化速率及相关蓄热性能。对于圆心角为90°且方向向上的翅片顺排分布的情况，其熔化速率分别比均匀矩形翅片和无翅片的情况高17%和93.1%，对应的熔化时间缩短了14.5%和50.4%。对于圆心角为90°的弧形翅片，采用错排分布时熔化速率提高了9%。与错排翅片分布相比，在区域底部添加额外的翅片显示出不利影响。当雷诺数（Re）分别从500增加到1000和1500时，充电时间分别减少5.8%和9.2%，而蓄热速率增加6.3%和10.3%。当流体入口温度为55°C或50°C时，与45°C相比，总充电时间分别增加98%和47%。
