Thermcapillary convection has been known as the dominant force in the flow and heat transfer during metals processings such as welding, drilling, cutting, and crystial growth, etc. Convection in the molten metal is typically vigorous and significant to the results of the process, in that it affects the size and shape of the pool, heat transfer, mixing of solutes, and ultimately microstructure of the finished product. In a melting or solidification process, thermocapillary effects may induce variations in local heat transfer, melting or solidification rates at the solid-liquid interface. thermocapillary flow originates at the hot wall and forms a surface layer along the free surface. The surface layer is driven by the thermocapillary force balanced by viscous stress. This region is followed by a region where the thermocapillary driving force has diminished due to a reduced temperature gradient.
steady-state convection induced by thermocapillary and buoyant forces near a corner region of an enclosure having an inclined wall is numerically studied.Introducing an immobilizationt transformation, the shapes of the free surface subject to an incident flux are predicted by simultaneously solving mass, momentum and energy equations in the liquid and energy equation in the surrounding solid. The results provide a deep insight into local heat transfer, melting ¡Nsolidification rates at the solid-liquid interface and defects such as rippling, undercutting, humping, porosity, segregation, etc.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0704100-182302 |
| Date | 04 July 2000 |
| Creators | Tu, Chun-Hsien |
| Contributors | F.B Hsiao, Shu-Hao Chuang, Peng-Sheng Wei |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0704100-182302 |
| Rights | unrestricted, Copyright information available at source archive |
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