Theoretical Analysis of Thermocapillary Flow in Cylindrical Columns of High Prandtl Number Fluids
| Autor: | Simon Ostrach, Yasuhiro Kamotani |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Physics
Oscillation Mechanical Engineering Prandtl number Mechanics Deformation (meteorology) Condensed Matter Physics Physics::Fluid Dynamics symbols.namesake Classical mechanics Flow (mathematics) Mechanics of Materials Free surface Heat transfer symbols General Materials Science Streamlines streaklines and pathlines Scaling |
| Zdroj: | Journal of Heat Transfer. 120:758-764 |
| ISSN: | 1528-8943 0022-1481 |
| DOI: | 10.1115/1.2824346 |
| Popis: | Steady and oscillatory thermocapillary flows of high Prandtl number fluids in the half-zone configuration are analyzed theoretically. Scaling analysis is performed to determine the velocity and length scales of the basic steady flow. The predicted scaling laws agree well with the numerically computed results. The physical mechanism of oscillations is then discussed. It is shown that the deformation of free surface plays an important role for the onset of oscillations in that it alters the main thermocapillary driving force of the flow by changing the temperature field near the hot-corner region. This phenomenon triggers oscillation cycles in which the surface flow undergoes active and slow periods. Based on that concept a surface deformation parameter is derived by scaling analysis. The deformation parameter correlates available data for the onset of oscillations well. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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