Hydrostatic instabilities in floating zone cristal growth process

Meseguer Ruiz, José and Perales Perales, José Manuel and Martínez Herranz, Isidoro (1999). Hydrostatic instabilities in floating zone cristal growth process. "Current Topics in Crystal Growth Research", v. 5 ; pp. 27-42. ISSN 0167-6105.

Description

Title: Hydrostatic instabilities in floating zone cristal growth process
Author/s:
  • Meseguer Ruiz, José
  • Perales Perales, José Manuel
  • Martínez Herranz, Isidoro
Item Type: Article
Título de Revista/Publicación: Current Topics in Crystal Growth Research
Date: 1999
ISSN: 0167-6105
Volume: 5
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Vehículos Aeroespaciales [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

If only Fluid Mechanics aspects are considered, the configuration appearing in the floating zone technique for crystal growth can be modelled as a mass of liquid spanning between two solid rods. Besides, if now the influence of temperature gradients and heat flow are not considered, the simplest fluid model consists of an isothermal liquid mass of constant properties (density and surface tension) held by capillary forces between two solid disks placed a distance L apart: the so called liquid bridge. As it is well known, if both supporting disks were parallel, coaxial and of the same diameter, 2R, the volume of liquid, V, were equal to that of a cylinder of the same L and R (V=KR~L) and no body forces were acting on the liquid column, the fluid configuration (under these conditions of cylindrical shape) will become unstable when the distance between the disks equals the length of the circumference of the supporting disks (L=2KR, the so-called Rayleigh stability limit). One should be aware that the Rayleigh stability limit can be dramatically modified when the geometry differs from the above described cylinder (due to having non-coaxial disks, different diameter disks, liquid volume different from the cylindrical one, etc) or when other external effects like accelerations either axial or lateral are considered. In this paper the stability limits of liquid bridges considering different types of perturbations are reviewed.

More information

Item ID: 39888
DC Identifier: http://oa.upm.es/39888/
OAI Identifier: oai:oa.upm.es:39888
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 11 Apr 2016 13:55
Last Modified: 11 Apr 2016 13:55
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