Numerical investigation of the stabilization of the no-motion state of a fluid layer heated from below and cooled from above
作者:
Jie Tang,
Haim H. Bau,
期刊:
Physics of Fluids
(AIP Available online 1998)
卷期:
Volume 10,
issue 7
页码: 1597-1610
ISSN:1070-6631
年代: 1998
DOI:10.1063/1.869679
出版商: AIP
数据来源: AIP
摘要:
The feasibility of controlling flow patterns of Rayleigh–Be´nard convection in a fluid layer confined in a circular cylinder heated from below and cooled from above (the Rayleigh–Be´nard problem) is investigated numerically. It is demonstrated that, through the use of feedback control, it is possible to stabilize the no-motion (conductive) state, thereby postponing the transition from a no-motion state to cellular convection. The control system utilizes multiple sensors and actuators. The actuators consist of individually controlled heaters positioned on the bottom surface of the cylinder. The sensors are installed at the fluid’s midheight. The sensors monitor the deviation of the fluid’s temperatures from preset desired values and direct the actuators to act in such a way so as to eliminate these deviations. The numerical predictions are critically compared with experimental observations. ©1998 American Institute of Physics.
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