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Influence of nonlinear thermal radiation on mixed convective hybrid nanofluid flow about a rotating sphere

机译：非线性热辐射对混合对流混合纳米流体围绕旋转球体流动的影响

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摘要

The present study investigates the mixed convective hybrid nanofluid flow over a rotating sphere under the impact of nonlinear thermal radiation. A model is built to examine the heat transport performance of ferrimagnetic magnetite and copper nanoparticles over a rotating sphere. Nonsimilar transformations are used to nondimensionalize the coupled nonlinear governing equations and the flow model's boundary conditions. Furthermore, the nondimensional governing equations were solved using implicit finite difference approximation and the quasilinearization technique. The impacts of the flow regime on many controlling parameters are then thoroughly addressed. Temperature patterns improve when nonlinear thermal radiation and hybrid nanofluid values increase. The fluid velocity and skin friction coefficient increase in the streamwise direction while decreasing in the rotating direction. The separation of the boundary layer is delayed as the sphere's rotation weakens. The stationary sphere has a larger boundary layer separation than the revolving sphere. The velocity distribution improves with increasing rotation parameter values while decreasing with increasing combined convection parameter values in the rotating direction. An increase in the temperature ratio parameter makes the fluid get hotter, and the Nusselt number goes down simultaneously. Nusselt number and skin friction coefficient in the rotation direction increase, while skin friction coefficient in streamwise direction reduces for increasing values of hybrid nanofluid. The velocity of the fluid enhances in the stream-wise direction while reducing in the rotational direction with the increasing values of the combined convection parameter.
机译：本研究调查的混合对流混合nanofluid流在旋转球体在非线性热的影响辐射。运输亚铁磁性磁铁的性能和铜纳米粒子在一个旋转的球体。Nonsimilar转换使用nondimensionalize耦合的非线性控制方程和流模型的边界条件。控制方程是解决使用隐式有限差分近似的quasilinearization技术。流态在许多控制参数然后彻底解决。当非线性热辐射和改善混合nanofluid值增加。速度和表面摩擦系数增加流向的方向而减少旋转方向。边界层和球体的延迟旋转减弱。边界层分离比旋转球体。改善与提高旋转参数值与增加而减少的总和在旋转对流参数值方向。参数使流体越来越热,同时努塞尔特数下降。数量和皮肤的摩擦系数转动方向增加,而表面摩擦流向方向系数降低增加混合nanofluid值。stream-wise流体的速度提高方向转动的同时减少增加价值的方向结合对流参数。

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