Mechanical Engineering Department, College of Engineering, Umm Al-Qura University, Makkah 24382, KSA, Saudi Arabia.
Department of Computer Science, Bahria University, Islamabad, 44000, Pakistan.
Nanotechnology. 2023 May 26;34(32). doi: 10.1088/1361-6528/acd38b.
Hybrid nanofluids have become a popular choice for various engineering and industrial applications due to their advanced properties. This study focuses on investigating the consequences of a low oscillating magnetic field on the flow of unsteady mono and hybrid nanofluids over a vertically moving permeable disk. Initially, iron oxide nanoparticles are mixed with water to create a mono nanofluid, which is later transformed into a hybrid nanofluid by adding cobalt nanoparticles. The shape of nanoparticles used is brick-shaped, and an external magnetic field is applied to regulate the flow and heat transfer mechanism using ferromagnetic nanoparticles. Additionally, the nonlinear thermal radiative heat flux is considered for the heat transfer phenomenon. The momentum and rotational motion of the magnetic fluid caused by the rotating disk are formulated using the Shliomis fundamental concept. The numerical analysis of the ordinary differential equations (ODEs) is carried out using the bvp4c technique, and the results are presented in tabular form for the surface drag coefficient and heat transmission at the walls. Moreover, the temperature and velocity distributions are illustrated using graphical representations against relevant parameters. The findings highlight that for a constant negative value for the magnetization parameterϒ<0,the heat transfer rate for hybrid nanofluid is witnessed stronger at a volume fractionϕhnf=0.120,whereas a minimal heat transfer rate is observed for positive values of magnetization parameterϒ>0at the same value of volume fraction.
混合纳米流体因其具有先进的性质而成为各种工程和工业应用的热门选择。本研究重点研究了低频振荡磁场对垂直运动可渗透盘上非稳态单/混合纳米流体流动的影响。首先，将氧化铁纳米粒子混入水中制成单纳米流体，然后通过添加钴纳米粒子将其转化为混合纳米流体。使用的纳米粒子形状为砖形，并施加外部磁场，通过铁磁性纳米粒子来调节流动和传热机制。此外，考虑非线性热辐射热通量对传热现象的影响。通过 Shliomis 基本概念来描述旋转盘引起的磁流体的动量和旋转运动。使用 bvp4c 技术对常微分方程（ODE）进行数值分析，并以表格形式呈现壁面表面曳力系数和传热的结果。此外，还通过图形表示温度和速度分布，以对抗相关参数。研究结果表明，对于磁化参数ϒ<0 的恒定负值，在体积分数ϕhnf=0.120 时，混合纳米流体的传热速率更强，而在相同体积分数时，磁化参数ϒ>0 的正值会观察到最小的传热速率。
