This article aims to simulate optimum thermal convection and minimization in entropy generation in viscous hybrid nanofluid (FeO-MWNTs/HO) flow in thermally cold star shaped enclosure and containing heated cylinder. Shape effect of cylinder in managing associated hydrothermal attributes is also interrogated. Physical aspect of magnetic field making angle of inclination with domain is accounted. Formulation of transport equations is expressed in the form of dimensionless partial differential setup containing the thermophysical relations of induced hybrid nanoparticles. The constructed flow issue has been simulated by using Galerkin finite element method (G-FEM) with appliance of COMSOL Multiphysics®software computer package.Results and grid convergence assessment tests are also executed in the study. Significant impact of flow controlling parameters on velocity, temperature and entropy generation profiles has been presented in graphical and tabular manner. Variation is three different types of entropies namely, viscous, thermal and magnetic are estimated. Quantities of interest like, total entropy, average Nusselt and Bejan numbers are also calculated against the sundry parameters. Ecological coefficient of performance which measures the efficiency of physical systems is interrogated which is important physical quantity in practical problems. It is inferred from the outcomes that induction of hybrid nanoparticles (FeO − MWCNT) produces considerable augmentation of thermal attributes of base fluid. Moreover, it is depicted that average Nusselt number exceeds up to 26.5 % for star shaped inner cylinder in comparison to the square cylinder. Increment up to 6 % in average Nusselt number and 2.19 % decrease in entropy is depicted when hybrid nanoparticles are added in the base fluid () in comparison to the situation when nanoparticles are not induced (.

中文翻译：

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通过在具有导热圆柱体和倾斜磁场方面的星形外壳中采用混合（Fe3O4 + MWNT）纳米液体的协同作用，增强传热和最小化熵产生

本文旨在模拟热冷星形外壳和包含加热圆柱体中的粘性混合纳米流体 (FeO-MWNT/H2O) 流动中的最佳热对流和熵产生最小化。圆柱体在管理相关热液属性中的形状效应也受到质疑。考虑了磁场与磁域的倾斜角的物理方面。输运方程的公式以无量纲偏微分设置的形式表示，其中包含诱导混合纳米粒子的热物理关系。采用伽辽金有限元法（G-FEM）并借助COMSOL Multiphysics®软件包对构造流问题进行了模拟。研究中还进行了结果和网格收敛性评估测试。流量控制参数对速度、温度和熵生成曲线的显着影响已以图形和表格方式呈现。变化是估计三种不同类型的熵，即粘性熵、热熵和磁熵。还根据各种参数计算了诸如总熵、平均努塞尔特数和贝扬数等感兴趣的量。生态绩效系数是实际问题中的重要物理量，它衡量物理系统的效率。从结果推断，混合纳米粒子（FeO - MWCNT）的诱导产生了基液热属性的显着增强。此外，与方形圆柱体相比，星形内圆柱体的平均努塞尔数超过了26.5%。与未诱导纳米颗粒的情况 (.