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首页> 美国卫生研究院文献>Nanoscale Research Letters >Numerical study of natural convection in a horizontal cylinder filled with water-based alumina nanofluid
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Numerical study of natural convection in a horizontal cylinder filled with water-based alumina nanofluid

机译：填充水基氧化铝纳米流体的水平圆柱体中自然对流的数值研究

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Natural heat convection of water-based alumina (Al2O3/water) nanofluids (with volume fraction 1% and 4%) in a horizontal cylinder is numerically investigated. The whole three-dimensional computational fluid dynamics (CFD) procedure is performed in a completely open-source way. Blender, enGrid, OpenFOAM and ParaView are employed for geometry creation, mesh generation, case simulation and post process, respectively. Original solver ‘buoyantBoussinesqSimpleFoam’ is selected for the present study, and a temperature-dependent solver ‘buoyantBoussinesqSimpleTDFoam’ is developed to ensure the simulation is more realistic. The two solvers are used for same cases and compared to corresponding experimental results. The flow regime in these cases is laminar (Reynolds number is 150) and the Rayleigh number range is 0.7 × 107 ~ 5 × 107. By comparison, the average natural Nusselt numbers of water and Al2O3/water nanofluids are found to increase with the Rayleigh number. At the same Rayleigh number, the Nusselt number is found to decrease with nanofluid volume fraction. The temperature-dependent solver is found better for water and 1% Al2O3/water nanofluid cases, while the original solver is better for 4% Al2O3/water nanofluid cases. Furthermore, due to strong three-dimensional flow features in the horizontal cylinder, three-dimensional CFD simulation is recommended instead of two-dimensional simplifications.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-015-0847-x) contains supplementary material, which is available to authorized users.
机译：数值研究了水平圆柱体中水基氧化铝（Al2O3 /水）纳米流体（体积分数分别为1％和4％）的自然对流。整个三维计算流体动力学（CFD）过程以完全开源的方式执行。 Blender，enGrid，OpenFOAM和ParaView分别用于几何图形创建，网格生成，案例模拟和后期处理。本研究选择了原始求解器“ buoyantBoussinesqSimpleFoam”，并开发了与温度有关的求解器“ buoyantBoussinesqSimpleTDFoam”以确保模拟更加逼真。两个求解器用于相同的情况，并与相应的实验结果进行比较。在这些情况下，流动状态为层流（雷诺数为150），瑞利数范围为0.7×10 7 〜5×10 7 。相比之下，发现水和Al2O3 /水纳米流体的平均自然Nusselt数随瑞利数增加。在相同的瑞利数下，发现努塞尔数随纳米流体体积分数而降低。发现与温度相关的求解器对水和1％Al2O3 /水纳米流体的情况更好，而原始求解器对4％Al2O3 /水纳米流体的情况更好。此外，由于卧式圆柱具有较强的三维流动特性，因此建议使用三维CFD模拟而不是二维简化。电子补充材料本文的在线版本（doi：10.1186 / s11671-015-0847-x）包含补充材料，授权用户可以使用。

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