TY - JOUR
T1 - Kinetic study of the Rayleigh-Bénard flows
AU - Zhang, Jun
AU - Fan, Jing
PY - 2009/2
Y1 - 2009/2
N2 - The present paper employs the direct simulation Monte Carlo (DSMC) method to study the Rayleigh-Bénard flows, where the temperature ratio of the upper to lower plate is fixed to 0.1. For a Knudsen number (Kn) of 0.01, as the Rayleigh number (Ra) increases, the flow changes from the thermal conductive state to the convective state at about Ra=1700, and the calculated relation of heat flux through the lower plate versus Ra is in good agreement with classical experimental and theoretical results. For Kn=0.05, the thermal conductive state remains stable, and the increase of Ra cannot trigger thermal instability.
AB - The present paper employs the direct simulation Monte Carlo (DSMC) method to study the Rayleigh-Bénard flows, where the temperature ratio of the upper to lower plate is fixed to 0.1. For a Knudsen number (Kn) of 0.01, as the Rayleigh number (Ra) increases, the flow changes from the thermal conductive state to the convective state at about Ra=1700, and the calculated relation of heat flux through the lower plate versus Ra is in good agreement with classical experimental and theoretical results. For Kn=0.05, the thermal conductive state remains stable, and the increase of Ra cannot trigger thermal instability.
KW - Critical Rayleigh number
KW - DSMC
KW - Rarefied gas effect
KW - Rayleigh-Bénard flows
KW - Thermal convection
UR - https://www.scopus.com/pages/publications/60449103335
U2 - 10.1007/s11434-008-0546-4
DO - 10.1007/s11434-008-0546-4
M3 - 文章
AN - SCOPUS:60449103335
SN - 1001-6538
VL - 54
SP - 364
EP - 368
JO - Chinese Science Bulletin
JF - Chinese Science Bulletin
IS - 3
ER -