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首页> 外文期刊>International Journal of Heat and Mass Transfer >Forced convective heat transfer of nanofluids around a circular bluff body with the effects of slip velocity using a multi-phase mixture model
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Forced convective heat transfer of nanofluids around a circular bluff body with the effects of slip velocity using a multi-phase mixture model

机译：使用多相混合物模型，纳米流体围绕圆形钝体的强迫对流传热，并受滑移速度的影响

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摘要

Forced convective heat transfer around a circular cylinder using nanofluids has been numerically analyzed employing a mixture model based Multi-Phase Modeling (MPM) approach. A hot circular cylinder with a constant wall temperature is exposed to a free stream of Al_2O_3-H_2O nanofluid at ambient temperature. The flow is steady, laminar and two dimensional in the Reynolds number range of 10 ≤ Re ≤ 40. The governing equations of flow and energy transfer along with the respective boundary conditions are numerically solved using a Finite Volume Method (FVM) based on SIMPLE algorithm. The prime aim of this work is to highlight the effects of slip velocity, volume concentration and diameter of nanoparticles on heat transfer characteristics of nanofluids. Results indicate that heat transfer increases with increase in nanoparticle volume fraction. The highest mean Nusselt number is observed at ø = 5% at any Reynolds number. It is also noted that, nanofluids with smaller nanoparticles result in higher heat transfer rates. Particular attention has been paid to the variation of heat transfer characteristics when the modeling approach is switched from Single-Phase Modeling (SPM) to mixture model based MPM. It is revealed that higher heat transfer rates are observed in MPM which considers the effects of slip velocity.
机译：已使用基于混合模型的多相建模（MPM）方法对使用纳米流体在圆柱周围的强制对流换热进行了数值分析。具有恒定壁温的热圆柱体在环境温度下暴露于自由的Al_2O_3-H_2O纳米流体流。在10≤Re≤40的雷诺数范围内，流动是稳定的，层流的和二维的。使用基于SIMPLE算法的有限体积法（FVM）数值求解流动和能量传递的控制方程以及相应的边界条件。 。这项工作的主要目的是强调滑移速度，纳米颗粒的体积浓度和直径对纳米流体传热特性的影响。结果表明，传热随着纳米颗粒体积分数的增加而增加。在任何雷诺数下，最高平均努塞尔数在ø= 5％处观察到。还应注意，具有较小纳米颗粒的纳米流体导致较高的传热速率。当建模方法从单相建模（SPM）切换到基于混合模型的MPM时，尤其要注意传热特性的变化。结果表明，考虑到滑移速度的影响，在MPM中观察到较高的传热速率。

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