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首页> 外文期刊>International Journal of Heat and Mass Transfer >Complex transition of double-diffusive convection in a rectangular enclosure with height-to-length ratio equal to 4: Part Ⅱ
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Complex transition of double-diffusive convection in a rectangular enclosure with height-to-length ratio equal to 4: Part Ⅱ

机译：高长比等于4的矩形罩中双扩散对流的复变：第二部分

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摘要

The paper investigates numerical results of double-diffusive convection in a slim rectangular enclosure with horizontal temperature and concentration gradients. The case with the thermal Rayleigh number, Ra-T = 10(5), the Prandtl number, Pr = 1, the Lewis number, Le = 2 and height-to-width aspect ratio, A = 4 is considered. Effects of the buoyancy ratio of composition to temperature, N, on dynamical behavior, flow structure and heat and mass transfer efficiency are investigated carefully. The present results suggest that with the buoyancy ratio N increasing from 1 to 2, the flow of transition is a complex series of changes from the periodic to quasi-periodic, chaotic, periodic, and finally to laminar with concentration dominated. There are three types of periodic flows, the first one is simple periodic flow with single fundamental frequency (FF), the second one is periodic flow with FF and its integer multiple of frequencies (INTMF), the last one is the more complex periodic flow with FF, INTMF and its sub-harmonic frequency multiple (SFM). A new type periodical solution with reverse central symmetrical structure is captured in the present paper. Multi cells structures traversing between two vertical walls will produce salt figure phenomenon and benefit to enhance heat and mass transfer efficiency. (C) 2019 Elsevier Ltd. All rights reserved.
机译：本文研究了具有水平温度和浓度梯度的细长矩形外壳中双扩散对流的数值结果。考虑热瑞利数为Ra-T = 10（5），普朗特数为Pr = 1，路易斯数为Le = 2且纵横比为A = 4的情况。仔细研究了组成与温度的浮力比N对动力学行为，流动结构以及传热传质效率的影响。目前的结果表明，随着浮力比N从1增加到2，过渡流是一系列复杂的变化过程，从周期性变化到准周期性，混沌，周期性，最后变为层流，其中浓度为主。周期流有三种类型，第一种是具有单个基频（FF）的简单周期流，第二种是具有FF及其频率整数倍（INTMF）的周期流，最后一种是更复杂的周期流FF，INTMF及其次谐波频率倍数（SFM）。本文提出了一种具有中心对称对称结构的新型周期解。在两个垂直壁之间穿行的多孔结构会产生盐像现象，并有利于提高传热和传质效率。 （C）2019 Elsevier Ltd.保留所有权利。

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