Thermocapillary motion of a solid cylinder near a liquid-gas interface
| Autor: | A. Arslanova, Naveen Krishna Reddy, Christian Clasen, Giovanniantonio Natale, Jan Fransaer |
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| Rok vydání: | 2020 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Mechanical Engineering Bulk temperature Bipolar cylindrical coordinates Computational Mechanics Reynolds number Mechanics Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Surface tension Physics::Fluid Dynamics Temperature gradient symbols.namesake Heat flux Mechanics of Materials 0103 physical sciences Fluid dynamics symbols Cylinder 010306 general physics |
| Popis: | The motion of a solid, infinitely long cylinder perpendicular to a convective liquid-gas interface due to thermocapillarity is investigated via an analytical model. If the cylin- der temperature differs from the bulk temperature, a temperature gradient exist along the liquid-gas interface. This results in surface tension gradients at the liquid-gas interface, causing fluid flow around the particle which induces propulsion. For small particles, and thus small Péclet and Reynolds numbers the steady-state equations for temperature and flow fields are solved exactly using two dimensional bipolar cylindrical coordinates. The velocity of the cylinder as a function of separation distance from the liquid-gas interface is determined for the case of a constant temperature or a constant heat flux on the surface of the cylinder. A larger temperature gradient at the liquid gas interface in the latter system leads to a larger cylinder velocity and a higher propulsion efficiency. The thermocapillary effect result in larger force on a cylinder than forces arising from other self-propulsion mechanisms. ispartof: Physics of Fluids vol:32 issue:12 status: Published online |
| Databáze: | OpenAIRE |
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