On the structure of the floating zone in melting

Da Riva de la Cavada, Ignacio y Meseguer Ruiz, José (1978). On the structure of the floating zone in melting. "Acta Astronautica", v. 5 (n. 9); pp. 637-653. ISSN 0094-5765.

Descripción

Título: On the structure of the floating zone in melting
Autor/es:
  • Da Riva de la Cavada, Ignacio
  • Meseguer Ruiz, José
Tipo de Documento: Artículo
Título de Revista/Publicación: Acta Astronautica
Fecha: 1978
Volumen: 5
Materias:
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Vehículos Aeroespaciales [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Floating zone melting is used in crystal growth and purification of high melting materials. The use of a reduced gravity environment will remove the constraint imposed on the length of the zone by the hydrostatic pressure. The equilibrium of the fioatmg zone may involve, (1)Hydrostatic forces, when the zone rotates as a whole. (2)Convective driving forces, when the zone is stationary but fluid property gradients appear.(3) Hydrodynamic forces, when some parts of the zone are set into motion with respect to others. The last effects are considered in this paper. The flow pattern of a floating zone held between two discs in relative motion is complicated, and thence the solution of the problem is difficult even assuming a constant property-newtonian liquid Nevertheless, when a small parameter appears m the problem, the complete flow field can be split into zones where simple solutions are found. To illustrate this approach, the spin up from rest of an initially cylindrical floating zone is considered with detail. Here the small parameter is the time elapsed from the impulsive starting of motion. Since the problem which has been considered, as well as some others which can be tackled by use of similar methods, concern the viscous layer close to either plate, they can be simulated experimentally in the ground laboratory with short floating zones. Procedures to produce these zones are indicated.

Más información

ID de Registro: 13747
Identificador DC: http://oa.upm.es/13747/
Identificador OAI: oai:oa.upm.es:13747
Depositado por: Biblioteca ETSI Aeronauticos
Depositado el: 22 Oct 2012 08:37
Ultima Modificación: 21 Abr 2016 13:06
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