Onset of double-diffusive convection in near-critical gas mixtures

Zhan-Chao Hu, Stephen H. Davis, and Xin-Rong Zhang
Phys. Rev. E 99, 033112 – Published 18 March 2019

Abstract

Near the thermodynamic critical point, the physical properties of binary fluids exhibit large variations in response to small temperature and concentration differences, whose effects on the onset of double-diffusive convection are reported here. The vertical symmetry is broken, irregular penetrative instability occurs, and cat's eye patterns are identified in the fingering regime and oscillatory regime, respectively. A new parameter Θ is defined which indicates how the variations of physical properties influence flow fields. It is seen through numerical simulations that the Boussinesq approximation with constant physical properties has limited applicability, and that the Boussinesq equations with variable properties and density will describe all features seen. This conclusion is based on comparisons with the fully compressible, variable-property system.

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  • Received 19 December 2018

DOI:https://doi.org/10.1103/PhysRevE.99.033112

©2019 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Fluid Dynamics

Authors & Affiliations

Zhan-Chao Hu

  • Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China and Department of Engineering Sciences and Applied Mathematics, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA

Stephen H. Davis*

  • Department of Engineering Sciences and Applied Mathematics, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA

Xin-Rong Zhang

  • Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China

  • *sdavis@northwestern.edu
  • xrzhang@pku.edu.cn

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Issue

Vol. 99, Iss. 3 — March 2019

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