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首页> 外文期刊>International Journal of Heat and Mass Transfer >Double-diffusive buoyancy convection in a square cuboid with horizontal temperature and concentration gradients
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Double-diffusive buoyancy convection in a square cuboid with horizontal temperature and concentration gradients

机译：具有水平温度和浓度梯度的方形长方体中的双扩散浮力对流

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摘要

Double-diffusive buoyancy convection in a three-dimensional (3D) square cuboid is studied in the present paper. Both the temperature and solute concentration gradients are applied horizontally. Direct numerical simulations are carried out for Rayleigh number 10≤Ra≤2 × 10~5, buoyancy ratio -2 ≤ R_p ≤ 0, and Lewis number 2 ≤ Le ≤ 1000. Different front-rear symmetric solutions are found, and the flow structures are essentially three-dimensional. As each of the parameters is varied, typical pitchfork bifurcation is encountered, given appropriate disturbances. The resultant asymmetric solution presents a diagonal flow configuration. Different solution branches are denoted in terms of Nusselt and Sherwood numbers and corresponding two-dimensional (2D) model results are also presented to depict the deviations. In some parameter ranges, the 2D model significantly over-predicts the heat and mass transfer rates. More importantly, it fails to predict any unsteadiness of the flow, even when the corresponding 3D solution is chaotic. The onset of convection from the quiescent equilibrium state is also considered.
机译：本文研究了三维（3D）方形长方体中的双扩散浮力对流。温度和溶质浓度梯度均水平施加。对瑞利数10≤Ra≤2×10〜5，浮力比-2≤R_p≤0，刘易斯数2≤Le≤1000进行直接数值模拟。找到了不同的前后对称解，并确定了流动结构本质上是三维的。随着每个参数的变化，给定适当的干扰，就会遇到典型的干草叉分叉。所得的不对称解呈现对角线流动配置。用Nusselt和Sherwood数表示不同的解分支，并且还提供了相应的二维（2D）模型结果来描述偏差。在某些参数范围内，二维模型显着高估了传热和传质速率。更重要的是，即使相应的3D解决方案很混乱，它也无法预测流量的任何不稳定情况。还考虑了从静态平衡状态开始的对流。

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  • 作者

    Zhi-Wu Chen; Jie-Min Zhan; Yok-Sheung Li; Ying-Ying Luo; Shuqun Cai;

  • 作者单位

    Dept. of Applied Mechanics and Engineering, Sun Yat-sen University, Guangzhou 510275, China ,State Key Laboratory of Tropical Oceanography. South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;

    Dept. of Applied Mechanics and Engineering, Sun Yat-sen University, Guangzhou 510275, China;

    Dept. of Civil & Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;

    Dept. of Applied Mechanics and Engineering, Sun Yat-sen University, Guangzhou 510275, China;

    State Key Laboratory of Tropical Oceanography. South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    double-diffusive convection; buoyancy; instability; pitchfork bifurcation;

    机译：双扩散对流浮力;不稳定干草叉分叉;

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