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Dadun > Depósito Académico > Facultad de Ciencias > Departamento de Física y Matemática Aplicada > DA - Ciencias - Física - Artículos de Revista >

Bénard-Marangoni thermal oscillators: an experimental study
Autor(es) : Mancini, H.L. (Héctor Luis)
Maza, D. (Diego)
Palabras clave : Materias Investigacion::Física
Fecha incorporación: 1997
Editorial : American Physical Society
ISSN: 1539-3755
Cita: Phys Rev E, 55 (3), pp. 2757-2768
Resumen
An experimental study of time-dependent Be´nard-Marangoni convection in small aspect ratio containers and high Prandtl number fluids is presented. Two similar systems with the same aspect ratio, depth, and type of fluid are compared: one with adiabatic lateral boundaries and the other with open boundaries. In spite of the fact that very different plan forms and flows appear, both systems exhibit an oscillating plan form and a discrete narrow-band frequency spectrum in the temperature signal, having the same threshold and similar frequencies. Coincidence in temporal behavior between physical variables ~temperature or velocity fields! and signals obtained from a distance representative of plan-form evolution or surface curvature is shown in the interval of the control parameter studied. The origin of a time-dependent regime arising from a boundary layer instability is discussed. Plan-form, temperature, and velocity measurements confirm this assumption, showing that this mechanism, first proposed in Rayleigh-Be´nard convection, also appears under the conditions of these experiments, in time-dependent behavior of Be´nard-Marangoni convection.
Enlace permanente: http://hdl.handle.net/10171/2125
Aparece en las colecciones: DA - Ciencias - Física - Artículos de Revista

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Fichero:  1997.PRE55.pdf
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