Alsabery Ammar I, Tayebi Tahar, Kadhim Hakim T, Ghalambaz Mohammad, Hashim Ishak, Chamkha Ali J
Refrigeration & Air-conditioning Technical Engineering Department, College of Technical Engineering, The Islamic University, Najaf, Iraq.
Department of Mathematical Sciences, Faculty of Science & Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia.
J Adv Res. 2020 Sep 28;30:63-74. doi: 10.1016/j.jare.2020.09.008. eCollection 2021 May.
Mixed convection flow and heat transfer within various cavities including lid-driven walls has many engineering applications. Investigation of such a problem is important in enhancing the performance of the cooling of electric, electronic and nuclear devices and controlling the fluid flow and heat exchange of the solar thermal operations and thermal storage.
The main aim of this fundamental investigation is to examine the influence of a two-phase hybrid nanofluid approach on mixed convection characteristics including the consequences of varying Richardson number, number of oscillations, nanoparticle volume fraction, and dimensionless length and dimensionless position of the solid obstacle.
The migration of composite hybrid nanoparticles due to the nano-scale forces of the Brownian motion and thermophoresis was taken into account. There is an inner block near the middle of the enclosure, which contributes toward the flow, heat, and mass transfer. The top lid cover wall of the enclosure is allowed to move which induces a mixed convection flow. The impact of the migration of hybrid nanoparticles with regard to heat transfer is also conveyed in the conservation of energy. The governing equations are molded into the non-dimensional pattern and then explained using the finite element technique. The effect of various non-dimensional parameters such as the volume fraction of nanoparticles, the wave number of walls, and the Richardson number on the heat transfer and the concentration distribution of nanoparticles are examined. Various case studies for AlO-Cu/water hybrid nanofluids are performed.
The results reveal that the temperature gradient could induce a notable concentration variation in the enclosure.
The location of the solid block and undulation of surfaces are valuable in the control of the heat transfer and the concentration distribution of the composite nanoparticles.
包括受迫驱动壁面在内的各种腔体中的混合对流流动与传热具有许多工程应用。研究此类问题对于提高电气、电子和核设备的冷却性能以及控制太阳能热操作和蓄热中的流体流动与热交换至关重要。
本基础研究的主要目的是考察两相混合纳米流体方法对混合对流特性的影响，包括理查森数、振荡次数、纳米颗粒体积分数以及固体障碍物的无量纲长度和无量纲位置变化的影响。
考虑了复合混合纳米颗粒由于布朗运动和热泳的纳米尺度力而产生的迁移。在封闭腔中部附近有一个内块，它对流动、热量和质量传递有贡献。封闭腔的顶盖壁面允许移动，从而引发混合对流流动。混合纳米颗粒迁移对传热的影响也在能量守恒中体现。控制方程被转化为无量纲形式，然后使用有限元技术进行求解。研究了各种无量纲参数，如纳米颗粒体积分数、壁面波数和理查森数对传热以及纳米颗粒浓度分布的影响。对AlO-Cu/水混合纳米流体进行了各种案例研究。
结果表明，温度梯度会在封闭腔内引起显著的浓度变化。
固体块的位置和表面的起伏对于控制复合纳米颗粒的传热和浓度分布具有重要价值。
