Selimefendigil Fatih, Ghachem Kaouther, Albalawi Hind, AlShammari Badr M, Labidi Taher, Kolsi Lioua
Department of Mechanical Engineering, College of Engineering, King Faisal University, Al Ahsa 31982, Saudi Arabia.
Department of Mechanical Engineering, Celal Bayar University, 45140 Manisa, Turkey.
Heliyon. 2024 Jan 26;10(3):e25101. doi: 10.1016/j.heliyon.2024.e25101. eCollection 2024 Feb 15.
In this study, convective heat transfer for nanofluid flow over multiple rotating cylinder in a confined space is analyzed under magnetic field while enclosure has one inlet and one outlet port. Three identical circular cylinder are used and the two walls of the cavity are considered to be elastic. The coupled fluid-structure interaction and magneto-convection problem is solved by finite element method. Impacts of rotational Reynolds number (Rew between -100 and 100), Hartmann number (Ha between 0 and 50), cylinder size (R between 0.001H and 0.11H) and Cauchy number (Ca between and ) on the flow and thermal performance features are explored. The flow field and recirculation inside the cavity are significantly affected by the activation of rotation and magnetic field. The vortices are suppressed by increasing the strength of magnetic field and thermal performance is improved. Thermal performance of 56.6% is achieved by activation of magnetic field at the highest strength with rotations of the circular cylinders. When rotations are active, heat transfer rate is reduced while up to 40% reduction is obtained without magnetic field. Cylinder size has the highest impact on the overall thermal performance improvement while up to 132% enhancements are achieved. The contribution of elastic walls on the thermal performance is slight while less than 5% improvements in the average heat transfer is obtained. An optimization study leads to 12.7% higher thermal performance improvements as compared to best case of parametric computational fluid dynamics simulation results while the optimum values of (Rew, Ha, R) is obtained as (-80.66, 50, 0.11H).
在本研究中，分析了在磁场作用下，受限空间内纳米流体流过多个旋转圆柱体时的对流换热情况，该封闭空间有一个入口和一个出口端口。使用了三个相同的圆柱体，并且腔体的两个壁面被视为弹性壁面。采用有限元方法求解流固耦合和磁对流问题。探讨了旋转雷诺数（Rew在-100至100之间）、哈特曼数（Ha在0至50之间）、圆柱体尺寸（R在0.001H至0.11H之间）和柯西数（Ca在[具体数值缺失]和[具体数值缺失]之间）对流动和热性能特征的影响。腔体内部的流场和再循环受到旋转和磁场激活的显著影响。通过增加磁场强度，涡旋受到抑制，热性能得到改善。在圆柱体旋转且磁场强度最高时激活磁场，可实现56.6%的热性能。当旋转起作用时，传热速率降低，在无磁场时最多可降低40%。圆柱体尺寸对整体热性能提升的影响最大，可实现高达132%的提升。弹性壁面对热性能的贡献较小，平均传热的提升不到5%。一项优化研究表明，与参数计算流体动力学模拟结果的最佳情况相比，热性能提升高出12.7%，同时获得了（Rew, Ha, R）的最佳值为（-80.66, 50, 0.11H）。
