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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer and entropy generation in mixed convection of a nanofluid within an inclined skewed cavity
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Heat transfer and entropy generation in mixed convection of a nanofluid within an inclined skewed cavity

机译：倾斜斜腔内纳米流体混合对流中的传热和熵产生

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摘要

The mixed convection of a Cu-water nanofluid in a skewed cavity which is slightly inclined from the horizontal is investigated. A co-ordinate transformation is used to transform the physical domain into the computational domain in an orthogonal co-ordinate system. A control volume method over a staggered grid arrangement is used to discretize the governing equations. The discretized equations are solved through a pressure-correction based S1MPLEC algorithm. Based on this algorithm a Fortran 95 computer code is developed, which has been executed in the IBM Power 7 server. The effects of relevant parameters such as, Richardson number (0.1 ≤ Ri ≤ 5), Reynolds number (100 ≤ Re ≤ 1000), nanoparticle volume fraction (0 ≤ φ ≤ 0.2) on the mixed convection of nanofluid is studied by considering acute to obtuse skew angle and inclination angle between -30° to 30°. We made a comparative study between several models for effective thermal conductivity and viscosity of a nanofluid. The entropy generation as well as the Bejan number is evaluated to illustrate the themnodynamic optimization of the mixed convection. Our results show that the flow and thermal fields within a skewed enclosure are sensible to the angle of inclination. The addition of nanoparticles produce an enhancement in the heat transfer but reduce the effect of buoyancy. The impact of the inclination angle on the heat transfer and entropy generation is analyzed for the considered range of the skew angle to determine the optimum heat transfer characteristics.
机译：研究了Cu-水纳米流体在倾斜腔中的混合对流，该腔从水平方向略微倾斜。坐标转换用于在正交坐标系中将物理域转换为计算域。交错网格布置上的控制量方法用于离散控制方程。离散方程通过基于压力校正的S1MPLEC算法求解。基于此算法，开发了Fortran 95计算机代码，该代码已在IBM Power 7服务器中执行。通过考虑锐角波的影响，研究了相关参数，如理查森数（0.1≤Ri≤5），雷诺数（100≤Re≤1000），纳米颗粒体积分数（0≤φ≤0.2）对纳米流体混合对流的影响。钝角和倾斜角在-30°到30°之间。我们对几种模型的纳米流体的有效导热率和粘度进行了比较研究。对熵的生成以及贝詹数进行了评估，以说明混合对流的动力学优化。我们的结果表明，倾斜外壳内的流场和热场对倾斜角度很敏感。纳米颗粒的添加增强了热传递，但是降低了浮力的影响。针对所考虑的偏斜角范围，分析了倾斜角对传热和熵产生的影响，以确定最佳的传热特性。

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