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洛巴托IIIA求解器在混合对流纳米流体模型数值处理中的新应用。

A novel application of Lobatto IIIA solver for numerical treatment of mixed convection nanofluidic model.

作者信息

Ahmad Iftikhar, Cheema Tahir Nawaz, Raja Muhammad Asif Zahoor, Awan Saeed Ehsan, Alias Norma Binti, Iqbal Sana, Shoaib Muhammad

机构信息

Department of Mathematics, University of Gujrat, Gujrat, Pakistan.

Future Technology Research Center, National Yunlin University of Science and Technology, 123 University Road, Section 3, Douliou, Yunlin, 64002, Taiwan, R.O.C..

出版信息

Sci Rep. 2021 Feb 24;11(1):4452. doi: 10.1038/s41598-021-83990-8.

Abstract

The objective of the current investigation is to examine the influence of variable viscosity and transverse magnetic field on mixed convection fluid model through stretching sheet based on copper and silver nanoparticles by exploiting the strength of numerical computing via Lobatto IIIA solver. The nonlinear partial differential equations are changed into ordinary differential equations by means of similarity transformations procedure. A renewed finite difference based Lobatto IIIA method is incorporated to solve the fluidic system numerically. Vogel's model is considered to observe the influence of variable viscosity and applied oblique magnetic field with mixed convection along with temperature dependent viscosity. Graphical and numerical illustrations are presented to visualize the behavior of different sundry parameters of interest on velocity and temperature. Outcomes reflect that volumetric fraction of nanoparticles causes to increase the thermal conductivity of the fluid and the temperature enhances due to blade type copper nanoparticles. The convergence analysis on the accuracy to solve the problem is investigated viably though the residual errors with different tolerances to prove the worth of the solver. The temperature of the fluid accelerates due the blade type nanoparticles of copper and skin friction coefficient is reduced due to enhancement of Grashof Number.

摘要

当前研究的目的是通过基于铜和银纳米颗粒的拉伸片,利用Lobatto IIIA求解器的数值计算能力,研究可变粘度和横向磁场对混合对流流体模型的影响。通过相似变换过程将非线性偏微分方程转化为常微分方程。采用一种基于有限差分的更新的Lobatto IIIA方法对流体系统进行数值求解。考虑Vogel模型以观察可变粘度和外加倾斜磁场对混合对流以及与温度相关的粘度的影响。给出了图形和数值说明,以可视化不同感兴趣的各种参数对速度和温度的影响。结果表明,纳米颗粒的体积分数会导致流体的热导率增加,并且由于叶片型铜纳米颗粒,温度会升高。通过具有不同容差的残差误差对求解问题的精度进行了可行的收敛性分析,以证明求解器的价值。由于铜的叶片型纳米颗粒,流体的温度升高,并且由于格拉晓夫数的增加,表面摩擦系数降低。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1bc5/7904794/669272d94f2d/41598_2021_83990_Fig1_HTML.jpg

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