Purpose

The purpose of this study is to apply the incompressible smoothed particle hydrodynamics (ISPH) method to simulate the natural convection flow from an inner heated Y-fin inside Y-shaped enclosure filled with nanofluid.

Design/methodology/approach

The dimensionless governing partial differential equations are described in the Lagrangian form and solved by an implicit scheme of the ISPH method. The embedded Y-fin is kept at a high temperature T_h with variable heights during the simulations. The lower area of Y-shaped enclosure is squared with width L = 1 m and its side-walls are kept at a low temperature T_c. The upper area of the Y-shaped enclosure is V-shaped with width 0.5 L for each side and its walls are adiabatic.

Findings

The performed simulations revealed that the height of the inner heated Y-fin plays an important role in the heat transfer and fluid flow inside the Y-shaped enclosure, where it enhances the heat transfer. Rayleigh number augments the buoyancy force inside the Y-shaped enclosure and, consequently, it has a strong impact on temperature distributions and strength of the fluid flow inside Y-shaped enclosure. Adding more concentration of the nanofluid until 10% has a slight effect on the temperature distributions and it reduces the strength of the fluid flow inside Y-shaped enclosure. In addition, the average Nusselt number is measured along the inner heated Y-fin and it grows as the Rayleigh number increases. The average Nusselt number is decreasing by adding more concentrations of the nanofluid.

Originality/value

An improved ISPH method is used to simulate the natural convection flow of Y-fin embedded in the Y-shaped enclosure filled with a nanofluid.

中文翻译：

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自然对流流动的不可压缩的平滑粒子流体动力学模拟，该自然对流是由填充有纳米流体的Y形外壳内的嵌入Y鳍形成的

目的

这项研究的目的是应用不可压缩的平滑粒子流体动力学（ISPH）方法来模拟内部加热的Y形翅片填充Y形外壳并填充纳米流体的自然对流。

设计/方法/方法

无量纲控制偏微分方程以拉格朗日形式描述，并通过ISPH方法的隐式方案求解。在仿真过程中，将嵌入的Y型鳍片保持在高温T _h下，高度可变。Y形外壳的下部面积为正方形，宽度L = 1 m，其侧壁保持在低温T _c。Y形外壳的上部区域为V形，每边的宽度为0.5 L，并且其壁是绝热的。

发现

进行的模拟表明，内部加热的Y鳍的高度在Y形外壳内部的传热和流体流动中起着重要作用，从而增强了传热。瑞利数增加了Y形外壳内部的浮力，因此，它对温度分布和Y形外壳内部流体流动的强度有很大影响。添加更多浓度的纳米流体直到10％对温度分布影响不大，并且降低了Y形外壳内部流体流动的强度。此外，平均努塞尔数沿内部加热的Y鳍测量，并且随着瑞利数的增加而增长。通过添加更多浓度的纳米流体，平均努塞尔数正在减少。

创意/价值

一种改进的ISPH方法被用来模拟Y型翅片的自然对流，该Y型翅片嵌入到充满纳米流体的Y形外壳中。