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首页> 外文期刊>International Journal of Modern Physics, C. Physics and Computers >Numerical computation of natural convection inside a curved-shape nanofluid-filled enclosure with nonuniform heating of the bottom wall
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Numerical computation of natural convection inside a curved-shape nanofluid-filled enclosure with nonuniform heating of the bottom wall

机译：底壁非均匀加热弯曲纳米流体填充外壳内自然对流的数值计算

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This paper performs a numerical analysis of the natural convection within two-dimensional enclosures (square enclosure and enclosures with curved walls) full of a H2O-Cu nanofluid. While their vertical walls are isothermal with a cold temperature T-c, the horizontal top wall is adiabatic and the bottom wall is kept at a sinusoidal hot temperature. The working fluid is assumed to be Newtonian and incompressible. Three values of the Rayleigh number were considered, viz., 10(3), 10(4), 10(5), the Prandtl number is fixed at 6.2, and the volume fraction phi is taken equal to 0% (pure water), 10% and 20%. The numerical simulation is achieved using a 2D-in-house CFD code based on the governing equations formulated in bipolar coordinates and translated algebraically via the finite volume method. Numerical results are presented in terms of streamlines, isotherms and local and average Nusselt numbers. These show that the heat transfer rate increases with both the volume fraction and the Rayleigh number, and that the average number of Nusselt characterizing the heat transfer raises with the nanoparticles volume fraction.
机译：本文对二维外壳内的自然对流（方形外壳和弯曲壁的外壳）进行了数值分析，满是H2O-Cu纳米流体。虽然它们的垂直壁是具有寒冷温度T-C的等温，但水平顶壁是绝热的，并且底壁保持在正弦温度下。工作流体被认为是牛顿和不可压缩的。考虑了瑞利数的三个值，viz，10（3），10（4），10（5），Prandtl数固定在6.2，并且体积分数phi等于0％（纯水） ，10％和20％。使用基于双极坐标制定的控制方程的2d内部CFD码实现数值模拟，并通过有限体积法转换成像。在流线，等温线和局部和平均营养数方面提出了数值结果。这些表明，传热速率随体积分数和瑞利数而增加，并且表征传热的平均数量呈纳米颗粒体积分数。

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