Abstract

In this paper, a numerical investigation in metal porous structures with Kelvin cell model is carried out on water/Al₂O₃ nanofluids using the single-phase model. The examined foams are characterized by a porosity of 0.95 and different values of cells per inch (CPI), equal to 10 and 20 CPI. Three different values of Al₂O₃ nanoparticle volume concentrations equal to 0, 2 and 4% are used. Results are presented and discussed in terms of pressure drop between the inlet and outlet sections. Furthermore, it has been possible to obtain a correlation used to find the value of permeability and drag coefficient for metal porous structures under investigation. It has been possible to notice how these two properties of the foam do not depend on the type of fluid but only on the geometric properties. In addition, the interfacial heat transfer coefficient between the fluid phase and the solid matrix has been estimated. In conclusion, the results in terms of Nusselt number as a function of Reynolds number based on the struct diameter show that it does not change varying the CPI values.

摘要

在本文中，使用单相模型对水/Al ₂ O ₃纳米流体进行了开尔文单元模型金属多孔结构的数值研究。所检查泡沫的特征在于孔隙率为 0.95，每英寸泡孔 (CPI) 值不同，等于 10 和 20 CPI。三种不同值的 Al ₂ O ₃使用等于 0、2 和 4% 的纳米颗粒体积浓度。结果根据入口和出口部分之间的压降来呈现和讨论。此外，可以获得用于确定所研究金属多孔结构的渗透率和阻力系数值的相关性。可以注意到泡沫的这两种特性如何不取决于流体类型而仅取决于几何特性。此外，还估算了流体相和固体基质之间的界面传热系数。总之，根据结构直径作为雷诺数函数的努塞尔特数的结果表明，它不会随着 CPI 值的变化而改变。