https://doi.org/10.1140/epjb/e2004-00277-7
Active thermal convection in vibrofluidized granular systems
State Key Laboratory of Modern Acoustics and Institute
of Acoustics, Nanjing University, Nanjing 210093, P.R. China
Corresponding author: a miaogq@nju.edu.cn
Received:
27
August
2003
Revised:
25
March
2004
Published online:
9
September
2004
We present a granular-hydrodynamic model that captures
the essence of convection in a fully vibrofluidized granular
system. The steady temperature distribution is solved
analytically. Numerical simulation shows that the convection
always develops through a supercritical bifurcation, with its
energy about 
of the random (heat) one. A comparison
calculation is performed for a normal fluid. The convection roll,
or an active roll as we call it, has an angular velocity gradient
from its interior to exterior. We conclude that active rolls are
universal.
PACS: 45.70.Mg – Granular flow: mixing, segregation and stratification / 47.20.Bp – Buoyancy-driven instability / 47.27.Te – Convection and heat transfer
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
