TY - JOUR
T1 - Three-dimensional numerical study of natural convection of supercritical binary fluid
AU - Li, Tian
AU - Zhang, Peng
AU - Long, Zhiqiang
AU - Shen, Biao
PY - 2017/1/1
Y1 - 2017/1/1
N2 - This paper numerically investigated the natural convection of supercritical nitrogen/argon (n(N2)∶n(Ar)=0.9∶0.1, n is amount of substance) binary fluid in a 3-dimensional rectangular cavity. The results showed that a stable thermal boundary layer forms at the bottom of the cavity during the initial heating phase, and the Piston effect plays a dominant role to accelerate the energy transport in this period. After the thermal plume breaks the boundary layer and moves upward, the natural convection occurs with the appearance of a cold boundary layer near the top. The Soret effect caused by the temperature gradient drives the component migration, and results in the Dufour effect which promotes the energy transport. This results indicate that the Soret effect and Dufour effect can promote the heat and mass transfer in the natural convection of supercritical binary fluids.
AB - This paper numerically investigated the natural convection of supercritical nitrogen/argon (n(N2)∶n(Ar)=0.9∶0.1, n is amount of substance) binary fluid in a 3-dimensional rectangular cavity. The results showed that a stable thermal boundary layer forms at the bottom of the cavity during the initial heating phase, and the Piston effect plays a dominant role to accelerate the energy transport in this period. After the thermal plume breaks the boundary layer and moves upward, the natural convection occurs with the appearance of a cold boundary layer near the top. The Soret effect caused by the temperature gradient drives the component migration, and results in the Dufour effect which promotes the energy transport. This results indicate that the Soret effect and Dufour effect can promote the heat and mass transfer in the natural convection of supercritical binary fluids.
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U2 - 10.16183/j.cnki.jsjtu.2017.01.003
DO - 10.16183/j.cnki.jsjtu.2017.01.003
M3 - Article
AN - SCOPUS:85016564860
VL - 51
SP - 12
EP - 17
JO - Shanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University
JF - Shanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University
SN - 1006-2467
IS - 1
ER -