利用倾斜磁场蠕动的混合纳米流体的熵产生分析

S. Kazmi, F. Abbasi, S. A. Shehzad
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摘要

本研究的目的是分析由蠕动调动的混合纳米流体的熵产生。混合纳米流体是铜[式:见正文]和氧化铁[式:见正文]纳米粒子在水中的悬浮液。计算了磁场、焦耳热、混合对流、热源/散热和粘性耗散的影响。利用润滑方法简化了控制方程组。对得到的微分方程系进行数值求解。特别注意分析混合纳米材料、哈特曼数和格拉肖夫数对熵生成、贝扬数、轴向速度、温度、壁面热传导率、压力梯度、表皮摩擦、努塞尔特数的影响。流动行为通过流线可视化。研究表明,固体纳米材料的体积分数越大,速度和温度就越低。格拉肖夫数和哈特曼数越高,速度和温度越高。哈特曼数越高,传热性能越好。[公式:见正文]和[公式:见正文]提高了熵生成和贝扬数。哈特曼数越高,压力梯度越小。纳米颗粒浓度的增加可降低表皮摩擦。高流速会增加捕集现象。
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Entropy generation analysis for hybrid nanofluid mobilized by peristalsis with an inclined magnetic field
The purpose of the present study is to analyse the entropy generation for the hybrid nanofluid mobilised by peristalsis. The hybrid nanoliquid is suspension of copper [Formula: see text] and iron-oxide [Formula: see text] nanoparticles in water. Impacts of magnetic field, Joule heating, mixed convection, heat source/sink and viscous dissipation are reckoned. Governing set of equations are simplified by using lubrication approach. Obtained system of differential equations are solved numerically. Special attention is paid to analyse the effects of hybrid nanomaterial, Hartman and Grashoff numbers on entropy generation, Bejan number, axial velocity, temperature, heat transmission rate at walls, pressure gradient, skin friction, Nusselt number. Flow behaviour is visualised through streamlines. The study reveals that velocity and temperature decrease on increasing the volume fraction of solid nanomaterials. Higher Grashoff and Hartman numbers augment both velocity and temperature. Better heat transfer performance is recorded for strong Hartman number. [Formula: see text] and [Formula: see text] improve Entropy generation and Bejan number. Higher Hartman number causes decrement in pressure gradient. Addition of nanoparticles concentration reduces skin friction. High flow rate increases trapping phenomenon.
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