化工学报 ›› 2020, Vol. 71 ›› Issue (S2): 127-134.DOI: 10.11949/0438-1157.20200694

• 流体力学与传递现象 • 上一篇    下一篇

方腔内耦合传热传质非对称流动数值模拟

李钰冰1(),杨茉1(),邓瑞英1,陆廷康2,戴正华2   

  1. 1.上海理工大学能源与动力工程学院,上海 200093
    2.上海市浦东新区特种设备监督检测所,上海 200136
  • 收稿日期:2020-06-03 修回日期:2020-06-22 出版日期:2020-11-06 发布日期:2020-11-06
  • 通讯作者: 杨茉
  • 作者简介:李钰冰(1991—),女,博士研究生,lybusst@163.com
  • 基金资助:
    国家自然科学基金项目(51736007);上海市质量技术监督局科研项目(2018-54)

Numerical simulation of asymmetric flow of coupled heat and mass transfer in a square cavity

Yubing LI1(),Mo YANG1(),Ruiying DENG1,Tingkang LU2,Zhenghua DAI2   

  1. 1.School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
    2.Pudong New Area Special Equipment Supervision and Inspection Institution, Shanghai 200136, China
  • Received:2020-06-03 Revised:2020-06-22 Online:2020-11-06 Published:2020-11-06
  • Contact: Mo YANG

摘要:

对带有质热源的方腔内流体传热传质进行数值研究。针对不同RaNcSrDf,探究对称方腔内流体传热传质的分岔特性。结果表明:存在临界Rac使流体流动形态发生转变,当Ra<Rac时,流体流线、温度场和浓度场对称分布;当Ra>Rac时,流体发生偏斜。增大浮升力,流体更易发生分岔现象。增强Soret和Dufour效应可增强传热对称性并增大流体发生分岔的临界Rayleigh数。

关键词: 双扩散对流, 耦合作用, 质热源, 对称解, 分岔

Abstract:

The heat and mass transfer of fluid in a square cavity with a solutal and thermal source is numerically investigated. For different Rayleigh numbers, buoyancy ratio, Soret and Dufour numbers, the bifurcation characteristics of heat and mass transfer in a symmetrical square cavity are studied systematically. The results show that there is a critical Rac for onset of bifurcation that changes the fluid flow pattern. When Ra < Rac, the streamline, temperature and concentration are symmetrically distributed; when Ra > Rac, the transition from a symmetrical state to a stable asymmetric state is observed. The fluid is more prone to bifurcation with increasing of buoyancy. An increment to the Soret and Dufour effects enhances heat transfer symmetry and increases the critical Rayleigh number for breaking symmetry.

Key words: double diffusion convection, coupling effect, mass and thermal source, symmetric solution, bifurcation

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