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Numerical analysis of natural convective heat transport of copper oxide-water nanofluid flow inside a quadrilateral vessel

机译：四边形容器内氧化铜-水纳米流体自然对流传热的数值分析

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摘要

Nanofluid based heat transfer approaches have a tremendous prospect to develop novel cost-effective cooling technologies. In response to this potential development, a problem of unsteady copper oxide-water nanofluid flow and natural convective heat transfer within a quadrilateral vessel with uniform heating of bottom wall using modified Buongiorno model are investigated. The sloping wall of the vessel is maintained at constant low temperature and the uniform thermal condition on the bottom heated wall is considered, whereas the upper horizontal wall is regarded as adiabatic. The governing equations along with boundary conditions are solved using the Galerkin finite element method. Partial differential equation solver COMSOL Multiphysics with Matlab interface is used in the simulation. The results of the present problem of a certain situation as a special case have been verified by the previously published standard numerical investigations. The flow, thermal and concentration fields, local and average Nusselt number for various pertinent parameters entered into the problem have been analyzed. The time evolutions for a steady-state solution are also examined. The results show that the adjustment factor with the optimal nanoparticle volume fraction and the thermal Rayleigh number controls the optimal heat transfer. The trapezoidal vessel having higher sloping angles with the vertical axis exhibits higher heat transfer. Heat transfer decreases rapidly in 1–10 nm size nanoparticles for a nanofluid solution.
机译：基于纳米流体的传热方法在开发新颖的具有成本效益的冷却技术方面具有广阔的前景。响应于这种潜在的发展，使用改进的Buongiorno模型研究了底壁均匀加热的四边形容器内不稳定的氧化铜-水纳米流体流动和自然对流换热的问题。容器的倾斜壁保持在恒定的低温下，并且考虑了底部加热壁上的均匀热条件，而上部水平壁被认为是绝热的。使用Galerkin有限元方法求解控制方程以及边界条件。仿真中使用了带有Matlab接口的偏微分方程求解器COMSOL Multiphysics。以前发布的标准数值研究已经验证了特定情况下当前问题的结果。分析了进入该问题的各种相关参数的流场，热场和浓度场，局部和平均努塞尔数。还研究了稳态解决方案的时间演变。结果表明，具有最佳纳米颗粒体积分数和热瑞利数的调节因子可控制最佳传热。与垂直轴具有较大倾斜角的梯形容器表现出较高的热传递。对于纳米流体溶液，在1-10 nm大小的纳米颗粒中，传热迅速降低。

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