Purpose

This paper aims to study the impact of convexity and concavity of the vertical borders on double-diffusive mixed convection. In addition, the study of entropy generation is performed. This numerical study has been carried out for different patterns of wavy edges to reveal their effects on heat and mass transfer phenomena.

Design/methodology/approach

Four different flow features are treated by varying the directions of convexity and concavity of the vertical walls. A uniform temperature, as well as concentration distributions, are introduced to the left border while keeping a cold temperature and low concentration for the right border. The horizontal boundaries are in adiabatic condition. The upper border of the chamber is moving in the right direction with an equal speed. The governing Navies–Stokes equations are designed to describe energy and species transport phenomena, and these equations are solved by compact scheme.

Findings

The investigated results are analyzed for various parameters, namely, Prandtl number, Richardson number, thermal Grashof number, Lewis number, Buoyancy ratio and amplitude of the wavy walls. It is observed that the thermal and solutal transfer performance becomes effective with lower Richardson numbers. The results reveal that the concavity and convexity of the side borders of the cabinet can control the thermosolutal performance. It is also observed that among all wavy chambers, Case-4 records maximum thermosolutal transfer rate, while Case-3 attains minimum thermosolutal transfer rate.

Originality/value

This work is an example of solar thermal power conversion, power collection systems, systems of energy deficiency, etc.

中文翻译：

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矩形以外的差热和溶解几何形状中的热溶质混合对流分析

目的

本文旨在研究垂直边界的凸凹度对双扩散混合对流的影响。此外，还进行了熵产生的研究。这项数值研究针对不同的波状边缘图案进行，以揭示它们对传热和传质现象的影响。

设计/方法论/途径

通过改变垂直壁的凸凹方向来处理四种不同的流动特征。左边界引入均匀的温度和浓度分布，同时保持右边界的低温和低浓度。水平边界处于绝热状态。腔室的上边界以相同的速度向右方向移动。控制海军-斯托克斯方程旨在描述能量和物质输运现象，并且这些方程通过紧凑格式求解。

发现

对各种参数的研究结果进行了分析，即普朗特数、理查森数、热格拉肖夫数、路易斯数、浮力比和波状壁的振幅。据观察，理查森数较低时，热和溶质传递性能变得有效。结果表明，柜体侧边框的凹凸可以控制热溶胶性能。还观察到，在所有波状室中，Case-4 记录了最大热溶质传递速率，而 Case-3 获得了最小热溶质传递速率。

原创性/价值

这项工作是太阳能热能转换、集电系统、能源不足系统等的一个例子。