Alqahtani Sultan, Rehman Sohail, Alshehery Sultan, Bibi Sehrish
Department of Mathematics & Statistics, The University of Haripur, 22620, Haripur, Pakistan.
College of Engineering, Mechanical Engineering Department, King Khalid University, Abha, Saudi Arabia.
Heliyon. 2023 Sep 12;9(10):e20056. doi: 10.1016/j.heliyon.2023.e20056. eCollection 2023 Oct.
The improved thermal performance of recently discovered hybridized nanofluids has become essential in large scale thermal processes. In fact, this is highly efficient technique to introduce the thermal efficiency of tranditional heat transferring fluids. The behavior of the nanofluid can be significantly impacted by the unsteady heating and magnetic field effects that may be present in many applications. Therefore, the current study investigat the unsteady magnetized flow of hybrid nanofluid with heat transport characteristics subject to thermal radiation and slip at the surface wall. The shrinking/stretching surface is chosen as a flow source, which is frequently occure in polymer technology, which deals with the deformability of elastic sheets, and in metallurgy, where continued strips are cooled. The novel form of shrinking surface flow is fundamentally a reverse flow and exhibits physical characteristics that differ significantly from the channel flow scenario. The distinctive features of this scruinity is the use of empirical relations to approximate the optimum thermophysical attributes of a water hybrid nanofluid in order to model the 2-dimensional flow past a flat shrinking/stretching sheet under the action of radiation, Lorentz forces and realastic boundary condition responses. The governing system of modelled equation are assembled using the Tiwari-Das model in conjunction with a hybrid mass-based nanofluid model. The bvp4c algorithm is employed within the computer MATLAB programme. The hybrid nanofluid flow shows conclusive improvement in the frictional coefficient and heat transport performance. However, the effectiveness the unsteadiness parameter deteriorates the heat transmission. In the contiguity of a suction parameter, multiple outcomes appear to arise for both stretched and shrinking instances. The coefficient of energy transport improves as the magnetic factor is augmented, however the skin coefficient of friction exhibits dual behavior for the second solutions. A time-dependence investigation is undertaken to figure out the reliability of the twin solutions, and it is discovered that merely one of them remains stable and aesthetically credible.
最近发现的混合纳米流体热性能的改善在大规模热过程中变得至关重要。事实上，这是提高传统传热流体热效率的高效技术。纳米流体的行为可能会受到许多应用中可能存在的非稳态加热和磁场效应的显著影响。因此，当前的研究调查了具有热传输特性的混合纳米流体在热辐射和表面壁滑移作用下的非稳态磁化流动。选择收缩/拉伸表面作为流动源，这在处理弹性片材可变形性的聚合物技术以及冷却连续带材的冶金中经常出现。收缩表面流动的新形式从根本上说是一种逆流，并且表现出与通道流动情况显著不同的物理特性。这项研究的独特之处在于使用经验关系来近似水基混合纳米流体的最佳热物理属性，以便对在辐射、洛伦兹力和真实边界条件响应作用下二维流过平坦收缩/拉伸片材的流动进行建模。使用Tiwari-Das模型结合基于混合质量的纳米流体模型来组装建模方程的控制系统。在计算机MATLAB程序中采用bvp4c算法。混合纳米流体流动在摩擦系数和热传输性能方面显示出决定性的改善。然而，非稳态参数的有效性会降低热传递。在存在抽吸参数的情况下，对于拉伸和收缩情况似乎会出现多种结果。随着磁因子的增加，能量传输系数提高，然而对于第二个解，表面摩擦系数表现出双重行为。进行了时间相关性研究以确定双解的可靠性，并且发现其中只有一个保持稳定且在美学上可信。
