Details

Autor(en) / Beteiligte

• Ueda, Hiromasa
• Komori, Satoru
• Miyazaki, Takeshi
• Ozoe, Hiroyuki

Titel

Time‐dependent thermal convection in a stably stratified fluid layer heated from below

Ist Teil von

• The Physics of fluids (1958), 1984-11, Vol.27 (11), p.2617-2623

Ort / Verlag

Woodbury, NY: American Institute of Physics

Erscheinungsjahr

1984

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Time‐dependent thermal convection resulting when a stably stratified fluid layer is heated from below is analyzed as an initial‐value problem of a linear model. The effect of stratification on its development and structure is investigated. The convection is found to develop in three stages. Initially the given disturbance induces oscillatory motion with the corresponding Brunt–Väisälä frequency. In the second stage the stratification works to form secondary cells above the primary cell. This multiple cell pattern, however, changes slowly but periodically with time. Finally, the convection grows with an exponential growth rate, retaining a similar cell pattern. The vertical scale of the primary cell decreases with the stratification level, while the horizontal scale remains constant. The onset time of the manifest convection is predicted to be delayed as the stratification shifts from neutral to stable conditions. Attaining a maximum, it then becomes slightly earlier. Experimental results supporting the model predictions are also presented.