Ramzan Muhammad, Shahmir Nazia, Ghazwani Hassan Ali S, Nisar Kottakkaran Sooppy, Alharbi Faizah M, Yahia I S
Department of Computer Science, Bahria University, Islamabad, 44000, Pakistan.
Department of Mechanical Engineering, Faculty of Engineering, Jazan University, Jazan, 45124, Kingdom of Saudi Arabia.
Sci Rep. 2022 Jan 10;12(1):436. doi: 10.1038/s41598-021-04173-z.
Solar thermal systems have low efficiency due to the working fluid's weak thermophysical characteristics. Thermo-physical characteristics of base fluid depend on particle concentration, diameter, and shapes. To assess a nanofluid's thermal performance in a solar collector, it is important to first understand the thermophysical changes that occur when nanoparticles are introduced to the base fluid. The aim of this study is, therefore, to analyze the hydrodynamic and heat characteristics of two different water-based hybrid nanofluids (used as a solar energy absorber) with varied particle shapes in a porous medium. As the heat transfer surface is exposed to the surrounding environment, the convective boundary condition is employed. Additionally, the flow of nanoliquid between two plates (in parallel) is observed influenced by velocity slip, non-uniform heat source-sink, linear thermal radiation. To make two targeted hybrid nanofluids, graphene is added as a cylindrical particle to water to make a nanofluid, and then silver is added as a platelet particle to the graphene/water nanofluid. For the second hybrid nanofluid, CuO spherical shape particles are introduced to the graphene/water nanofluid. The entropy of the system is also assessed. The Tiwari-Das nanofluid model is used. The translated mathematical formulations are then solved numerically. The physical and graphical behavior of significant parameters is studied.
由于工作流体的热物理特性较弱，太阳能热系统效率较低。基础流体的热物理特性取决于颗粒浓度、直径和形状。为了评估纳米流体在太阳能集热器中的热性能，首先了解将纳米颗粒引入基础流体时发生的热物理变化非常重要。因此，本研究的目的是分析两种不同形状颗粒的水基混合纳米流体（用作太阳能吸收器）在多孔介质中的流体动力学和热特性。由于传热表面暴露于周围环境，采用对流边界条件。此外，观察到两平板间（平行）纳米流体的流动受速度滑移、非均匀热源-热汇、线性热辐射的影响。为制备两种目标混合纳米流体，将石墨烯作为圆柱状颗粒添加到水中制成纳米流体，然后将银作为片状颗粒添加到石墨烯/水纳米流体中。对于第二种混合纳米流体，将氧化铜球形颗粒引入石墨烯/水纳米流体中。还评估了系统的熵。使用了蒂瓦里-达斯纳米流体模型。然后对翻译后的数学公式进行数值求解。研究了重要参数的物理和图形行为。
