Banca de DEFESA: HORUS IBRAHIM ORLANDI

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : HORUS IBRAHIM ORLANDI
DATA : 03/03/2020
HORA: 14:00
LOCAL: Santo André
TÍTULO:

Influence of the electronic mass on the Rayleigh-Taylor instability

PÁGINAS: 130
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
SUBÁREA: Física dos Fluídos, Física de Plasmas e Descargas Elétricas
ESPECIALIDADE: Física de Plasmas e Descargas Elétricas
RESUMO:

In this thesis we present an analytical formulation of Rayleigh-Taylor instability in magnetized plasmas using a modified expression of Ohm’s law, which includes an electron-mass dependent term. For this, first, the Rayleigh-Taylor instability is addressed in a classic fluid of hydrodynamics and in an ideal plasma magnetically confined. In order to describe satisfactorily the dissipative processes at sufficiently high rates and, therefore, the generalized Ohm’s law will be addressed taking into account the inertia of the electronic mass. Then, with this approach, a formulation of Rayleigh-Taylor instability is developed in a viscousresistive plasma slab under the action of a shear magnetic field and a current density. In the neighborhood of the rational surface, the density of restorative force approximates of the density of gravitational force. In this region, when the viscous effects are negligible, it is shown that the viscous-resistive layer is provided by the resistive layer. However, when the viscous effects become important, it is verified that the viscous-resistive boundary layer is given by the geometric mean of the resistive and viscous boundary layers. Thus, a dispersion ratio for the growth rate of the perturbative modes is obtained in terms of the viscous-resistive layer. Finally, the scale of the temporal growth rate of Rayleigh-Taylor instability with plasma resistivity, fluid viscosity and electron density is presented and discussed.

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 2604186 - FRANCISCO EUGENIO MENDONCA DA SILVEIRA
Membro Titular - Examinador(a) Interno ao Programa - 382324 - VILSON TONIN ZANCHIN
Membro Titular - Examinador(a) Interno ao Programa - 2616823 - ALYSSON FABIO FERRARI
Membro Titular - Examinador(a) Externo à Instituição - JOSÉ HELDER FACUNDO SEVERO - USP
Membro Titular - Examinador(a) Externo à Instituição - ZWINGLIO DE OLIVEIRA GUIMARÃES FILHO - USP
Membro Suplente - Examinador(a) Interno ao Programa - 1549709 - GERMAN LUGONES
Membro Suplente - Examinador(a) Interno ao Programa - 1907614 - MAURICIO RICHARTZ
Membro Suplente - Examinador(a) Externo à Instituição - IBERÊ LUIZ CALDAS - USP
Membro Suplente - Examinador(a) Externo à Instituição - RICARDO MAGNUS OSÓRIO GALVÃO - USP