Natural convection characteristics of a reacting nanofluid with variable properties in a porous and fluid layered cavity

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-09-28 DOI:10.1016/j.tsep.2025.104147

Nepal Chandra Roy

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Abstract

Natural convection in a partitioned enclosure with porous and fluid layers is of research interest due to its occurrence in crude oil production, percolation of chemical pollutants through porous soil, moisture penetration in grain storage, and nuclear waste storage. This study analyzes the natural convection characteristics of a chemically reacting nanofluid in a partitioned cavity considering variable thermophysical properties of the nanofluid and an inclined magnetic field. It is the first investigation to date which considers a chemically reacting nanofluid in a partitioned cavity. Defining suitable variable transformations, the governing equations are reduced to a set of nondimensional equations which are solved numerically using the finite difference method. An increase in Darcy number leads to a decrease in fluid flow of nanofluid layer and an increase in flow velocity of porous layer and maximum temperature. For higher Rayleigh number, the flow intensity and remaining oxidizer concentration increase; however, the maximum temperature diminishes. Moreover, the magnitude of the stream function and maximum temperature increase, while the remaining amount of oxidizer decreases with increasing Frank-Kamenetskii number and Hartmann number. However, the opposite effect is recognized for the increase in the porous layer thickness. As the volume fraction of nanoparticles increases, the maximum temperature first increases and then decreases, while the converse scenario is observed for the magnitude of flow circulation in the fluid layer.

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具有可变性质的反应纳米流体在多孔流体层状腔中的自然对流特性

在具有多孔和流体层的隔离围场中，由于自然对流在原油生产、化学污染物通过多孔土壤的渗透、粮食储存中的水分渗透和核废料储存中都有发生，因此引起了人们的研究兴趣。考虑纳米流体热物理性质的变化和倾斜磁场的作用，分析了纳米流体在分区腔中化学反应的自然对流特性。这是迄今为止第一次研究考虑了纳米流体在分区腔中的化学反应。通过定义适当的变量变换，将控制方程简化为一组无量纲方程，用有限差分法对其进行数值求解。达西数的增加导致纳米流体层的流体流动减少，孔隙层的流速和最高温度升高。瑞利数越高，流动强度越大，残余氧化剂浓度越高；然而，最高温度降低。随着Frank-Kamenetskii数和Hartmann数的增加，流函数的大小和最高温度增加，而氧化剂的残留量减少。然而，多孔层厚度的增加则产生相反的效果。随着纳米颗粒体积分数的增加，最高温度先升高后降低，而流体层内流动循环的大小则相反。

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

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