Three-Dimensional Waves in Tilt Thermal Boundary Layers  

作　　者：陶建军 袁湘江 

机构地区：[1]LTCS and CAPT, College of Engineering, Peking University, Beijing 100871 [2]National CFD Laboratory, Beijing 100083

出　　处：《Chinese Physics Letters》2009年第2期176-179,共4页中国物理快报（英文版）

基　　金：Supported bv the National Natural Science Foundation of China under Grant No 10672003.

摘　　要：We numerically and theoretically study the stabilities of tilt thermal boundary layers immersed in stratified air. An interesting phenomenon is revealed： the stationary longitudinal-roll mode becomes unstable to some oscillating state even when the Grashof number is smaller than its corresponding critical value. By stability analysis, this phenomenon is explained in terms of a new three-dimensional wave mode. The effect of the tilt angle on the stability of the boundary flows is investigated. Since the new three-dimensional wave is found to be the most unstable mode when the title angle is between 30° and 64°, it is expected to play an important role in the transition to turbulence.We numerically and theoretically study the stabilities of tilt thermal boundary layers immersed in stratified air. An interesting phenomenon is revealed： the stationary longitudinal-roll mode becomes unstable to some oscillating state even when the Grashof number is smaller than its corresponding critical value. By stability analysis, this phenomenon is explained in terms of a new three-dimensional wave mode. The effect of the tilt angle on the stability of the boundary flows is investigated. Since the new three-dimensional wave is found to be the most unstable mode when the title angle is between 30° and 64°, it is expected to play an important role in the transition to turbulence.

关 键 词：field emission molybdenum dioxide enhancement factor 

分 类 号：TQ050.2[化学工程] TD713.2[矿业工程—矿井通风与安全]