Purpose

This paper aims to investigate the flow and heat transfer characteristics of a hybrid nanofluid (Cu-Al₂O₃/water) in the presence of magnetohydrodynamics and thermal radiation over a permeable moving surface.

Design/methodology/approach

By choosing appropriate similarity variables, the partial differential equations are transformed into a system of linear equations which are solved by using the boundary value problem solver (bvp4c) in MATLAB. The implementation of stability analysis verifies the achievable result of the first solution which is considered stable while the second solution is unstable.

Findings

The findings revealed that the presence of a magnetic field and suction slows down the fluid motion because of the synchronism of the magnetic and electric field occurred from the formation of the Lorentz force. Also, the enhancement of the thermal radiation parameter escalates the heat transfer rate of the current study.

Originality/value

The present study is addressing the problem of MHD flow and heat transfer analysis of a hybrid nanofluid towards a permeable moving surface, with the consideration of the thermal radiation effect. The authors show that in both cases of assisting and opposing flow, there exist dual solutions within a specific range of the moving parameters. A stability analysis approved that only one of the solutions are physically relevant.

中文翻译：

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在存在热辐射的情况下，混合纳米流体在可渗透运动表面上的MHD流动和传热

目的

本文旨在研究在磁流体动力学和热辐射在可渗透运动表面上存在的混合纳米流体（Cu-Al ₂ O ₃ /水）的流动和传热特性。

设计/方法/方法

通过选择适当的相似性变量，可以将偏微分方程转换为线性方程组，可以使用MATLAB中的边界值问题求解器（bvp4c）对其进行求解。稳定性分析的实施验证了第一种解决方案的可实现结果，该解决方案被认为是稳定的，而第二种解决方案不稳定。

发现

这些发现表明，由于洛伦兹力的形成会产生磁场和电场的同步，因此磁场和吸力的存在会减慢流体的运动。而且，热辐射参数的增加使当前研究的传热速率升高。

创意/价值

本研究正在解决MHD流动和杂化纳米流体向可渗透运动表面的传热分析问题，同时考虑了热辐射效应。作者表明，在辅助流动和反向流动的情况下，在运动参数的特定范围内都存在双重解决方案。稳定性分析证实，只有一种解决方案在物理上相关。