基于最小模态和高模态Lorenz模型的水-铜和水-氧化铝纳米流体的rayleigh - b对流

P. Siddheshwar, Ruwaidiah Idris, C. Kanchana, David Laroze
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摘要

本文研究了水-铜和水-氧化铝纳米流体中瑞利- b纳德对流的线性和非线性稳定性分析,考虑了最小和扩展截断傅里叶表示。这些表示分别得到了三阶经典洛伦兹模型和五维扩展洛伦兹模型。边际稳定性分析图表明,纳米粒子在水中的稀释浓度对体系的稳定性有影响。不稳定的速率取决于纳米颗粒的热物理性质和它们的体积分数。在水平方向上添加附加模式的影响是修改单元格大小。这可以通过边缘曲线和流线图观察到。此外,从努塞尔数图中可以明显看出,水中纳米颗粒的稀释浓度显著增强了系统中的热传递。利用分岔图研究了最小和扩展洛伦兹模型的动力学行为。从研究中出现的一个重要发现是,预计傅里叶截断解在低阶和高阶模型中具有不同的效果。与经典的三阶洛伦兹模型相比,扩展的五模态洛伦兹系统预测了混沌的提前发生。这两种纳米粒子在水中的单独影响是促进对流的开始以及促进混沌的开始。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Rayleigh-Bénard Convection of Water-Copper and Water-Alumina Nanofluids Based on Minimal- and Higher-Mode Lorenz Models
Linear and nonlinear stability analyses of Rayleigh–Bénard convection in water-copper and water-alumina nanofluids are studied in the paper by considering a minimal as well as an extended truncated Fourier representation. These representations respectively result in a third-order classical Lorenz model and a five-dimensional extended Lorenz model. The marginal stability plots reveal that the influence of added dilute concentration of nanoparticles in water is to destabilize the system. The rate of destabilization depends on the nanoparticles’ thermophysical properties and their volume fraction. Influence of adding an additional mode in the horizontal direction is to modify the cell size. This can be observed through the marginal curves as well as the stream line plots. Further, from the Nusselt number plots it is evident that the presence of dilute concentration of nanoparticles in water is to enhance heat transport in the system significantly. The dynamical behavior of the minimal and the extended Lorenz models is investigated using the bifurcation diagram. From the study an important finding that emerges is that the Fourier truncated solution is predicted to have different effects in lower-order and higher-order models. The extended penta-modal Lorenz system predicts advanced onset of chaos compared to that predicted by the classical third-order Lorenz model. The individual influence of both nanoparticles in water is to advance the onset of convection as well as to advance the onset of chaos.
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