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首页> 外文期刊>International Journal of Heat and Mass Transfer >Stability of a double diffusive convection in a Darcy porous layer saturated with Maxwell nanofluid under macroscopic filtration law: A realistic approach
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Stability of a double diffusive convection in a Darcy porous layer saturated with Maxwell nanofluid under macroscopic filtration law: A realistic approach

机译：宏观过滤法下麦克斯韦纳米流体饱和的达西多孔层中双扩散对流的稳定性：一种现实的方法

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摘要

Double diffusive convection in a Darcy Maxwell Buongiorno's nanofluid confined between two parallel plates incorporating thermophoretic and Brownian diffusion has been examined. Two important aspects of the study are: the macroscopic filtration law for Darcy Maxwell fluid and zero nanoparticle flux at the boundaries. Under normal mode analysis of linear stability theory, Galerkin-type weighted residual technique is employed and the stationary and oscillatory convections are analyzed. It is found that Horton-Rogers’ Rayleigh number is reduced due to the two peers of the flow-nanoparticles and sa stationary convection is governed indirectly by the Brownian motion and thermophoresis through the coupling between buoyancy and conservation of nanoparticles and the solutal diffusivity inhibits the convection. Further it is found that the mode of convection is changed in the presence of salt as the oscillatory convection is suppressed by stationary convection throughout the flow domain. Under non-linear stability analysis the Nusselt numbers corresponding to heat, salt and mass are derived for steady as well as unsteady state. The effect of different parameters is found on the rate of transfer of heat, salt and mass and the mode of isotherms, isonanoconcentrations and isohalines is established in the two states.
机译：已经研究了Darcy Maxwell Buongiorno纳米流体中的双重扩散对流，该对流被限制在结合了热泳和布朗扩散的两个平行板之间。研究的两个重要方面是：Darcy Maxwell流体的宏观过滤规律和边界处的零纳米粒子通量。在线性稳定性理论的正态分析下，采用Galerkin型加权残差技术，并分析了平稳对流和振荡对流。发现由于流动纳米粒子和盐的两个对等点，霍顿-罗杰斯的瑞利数减少了。静态对流是通过布朗运动和热泳间接控制的，它通过纳米颗粒的浮力和守恒之间的耦合来实现，而溶质扩散率会抑制对流。进一步发现，在盐的存在下，对流模式改变了，因为振荡对流被整个流动域中的固定对流所抑制。在非线性稳定性分析下，针对稳态和非稳态推导了与热量，盐和质量相对应的Nusselt数。发现了不同参数对热量，盐和质量的传递速率的影响，并且在这两种状态下建立了等温线，等离子浓度和异卤的模式。

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