拉伸表面上非正交停滞点附近混合纳米流体的对流滑移流动

Tanvi Singla, Sapna Sharma, Bhuvaneshvar Kumar
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摘要

本分析涉及混合纳米流体(HNF)在具有速度滑移和对流边界的加热或冷却拉伸片停滞点附近的稳定混合对流。要弄清混合纳米流体(HNF)流动对表面的热影响,就必须了解纳米粒子的分组运动学。该问题的表述包括以水为基础流体的纳米颗粒和铜。常微分方程是利用比例变量从偏微分方程导出的。利用 Runge-Kutta 射线法对支配方程组进行了数值求解。停滞、滑移、辐射、斜度、对流和纳米颗粒的体积分数等参数都是影响总速度以及温度曲线、努塞尔特数和皮肤摩擦系数的关键因素。热传导率随着自由流停滞速度、Biot 数和辐射参数的增加而上升。当纳米颗粒的体积从 2% 增加到 5% 时,传热率从 2.97% 增加到 10.48%。因此,纳米铜粒子的加入改善了热传递特性。此外,正斜度和负斜度的流线型图案方向不同。根据斜度和停滞速度的不同,加热板和冷却板的零剪应力点分别向原点的右侧和左侧移动。
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Convective slip flow of a hybrid nanofluid near a non‐orthogonal stagnation point over a stretching surface
The present analysis deals with a steady mixed convective flow of hybrid nanofluid (HNF) near the stagnation point of a heated or cooled stretching sheet with velocity slip and convective boundaries. The understanding of nanoparticle grouping kinematics is essential to figure out the thermal impact of HNF flow on the surface. This problem formulation consists of and Cu as nanoparticles with water as a base fluid. The ordinary differential equations are derived from partial differential equations using scaling variables. The governing system of equations has been solved numerically by using the shooting method with Runge–Kutta approach. Parameters such as stagnation, slip, radiation, obliqueness, convection, and the volume fraction of nanoparticles all are key factors influencing the overall velocity as well as the temperature profiles, Nusselt number and skin friction coefficient. The heat transfer rate rises with increasing the stagnation velocity of the free stream, Biot number, and radiation parameter. When the volume of nanoparticles increases from 2% to 5%, the heat transfer boosts up from 2.97% to 10.48%. Hence, the addition of copper nanoparticles has improved the heat transmission characteristics. Also, streamlined patterns for positive and negative obliqueness are in different orientations. The point of zero shear stress moves towards the right and left of the origin for heated and cooled sheet, respectively, depending on the obliqueness and stagnation velocity.
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