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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Natural convection of nanofluids flow with 'nanofluid-oriented' models of thermal conductivity and dynamic viscosity in the presence of heat source
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Natural convection of nanofluids flow with 'nanofluid-oriented' models of thermal conductivity and dynamic viscosity in the presence of heat source

机译：在存在热源的情况下，采用“面向纳米流体”的导热系数和动态粘度模型对自然流体进行自然对流

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Purpose - The purpose of this paper is to make a numerical study of natural convection of water-based nanofluids in a square cavity when a discrete heat source is embedded on the bottom wall, applying a "nanofluid-oriented" model for the calculation of the effective thermal conductivity (Xu-Yu-Zou-Xu's model) and the effective dynamic viscosity (Jang-Lee-Hwang-Choi's model). Another motivation is the numerical solution of the equations of the flow with a meshless method. Design/methodology/approach - A meshless point collocation method with moving least squares (MLS) approximation is used. A test validation study of the numerical method takes place for pure water flow, as well for water/Al_2O_3 nanofluids. The influence of pertinent parameters such as Rayleigh number (Ra), the non-uniform nanoparticle size keeping the mean nanoparticle diameter fixed, the volume fraction of nanoparticles and the location of heat source on the cooling performance are studied. Findings - The presence of a discrete heat source, as well as the various thermal boundary conditions affects the characteristics of the nanofluid flow and heat transfer. When the ratio of minimum to maximum nanoparticle diameter is increased, the local Nusselt number is increased and the heat source temperature is decreased. The increase of solid volume fraction of nanoparticles causes the heat source maximum temperature to decrease and the Nusselt Number to increase. Originality/value - The present study constitutes an original contribution to the nanofluid flow and heat transfer characteristics when a discrete heat source is presence. "Nanofluid-oriented" models are used for the calculation of the effective thermal conductivity and dynamic viscosity.
机译：目的-本文的目的是当离散热源嵌入底壁时，对方形空腔中水基纳米流体的自然对流进行数值研究，并应用“面向纳米流体”的模型来计算有效导热系数（Xu-Yu-Zou-Xu模型）和有效动态粘度（Jang-Lee-Hwang-Choi模型）。另一个动机是使用无网格方法对流动方程进行数值解。设计/方法/方法-使用具有移动最小二乘（MLS）近似的无网格点配置方法。对纯水以及水/ Al_2O_3纳米流体进行了数值方法的测试验证研究。研究了诸如瑞利数（Ra），保持纳米平均粒径固定的纳米颗粒尺寸不均匀，纳米颗粒的体积分数和热源位置等相关参数对冷却性能的影响。发现-离散热源的存在以及各种热边界条件会影响纳米流体的流动和传热特性。当最小与最大纳米颗粒直径的比率增加时，局部努塞尔数增加并且热源温度降低。纳米颗粒的固体体积分数的增加导致热源最高温度降低并且努塞尔数增加。原创性/价值-当存在离散的热源时，本研究对纳米流体的流动和传热特性做出了原创性贡献。 “面向纳米流体”的模型用于计算有效导热系数和动态粘度。

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