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8º Seminário do PPG-EM UERJ / 2015

Criada em 18/08/2015 17:02 por maperna | Marcadores: evento fen MECAN phoenix ppgem

 

O Programa de Pós Graduação em Engenharia Mecânica da UERJ - PPG-EM - convida a todos para o 8º Seminário do PPG-EM UERJ / 2015

Serão apresentações de dois alunos vindos de universidades europeias que falarão sobre modelagem numérica usando elementos e volumes finitos. As apresentações serão feitas em inglês e é aberta a alunos de graduação.
 
 
Local: Auditório da Incubadora Phoenix - Fonseca Teles 121, Rio de Janeiro - RJ; 3º andar do edifício anexo.
  
Data: 19 de agosto de 2015 (quarta-feira)
Horário: 16h

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NUMERICAL MODELLING OF TWO-PHASE FLOWS WITH MOVING CONTACT LINES

Erik Gros - Swiss Federal Institute of Technology in Lausanne (EPFL)

Resumo:
Numerical simulation is employed to simulate two-phase flow phenomena using the continuum method for surface tension modeling. The set of equations are based on the ’one-fluid’ Arbitrary Lagrangian-Eulerian (ALE) description of the Navier-Stokes equations. These equations are discretized by the Finite Element method on an unstructured mesh in which the phase boundary is represented by a set of interconnected elements that are part of the computational mesh, thus a sharp representation is successfully achieved. The presented modeling will then be used to investigate two-phase flows with moving contact lines, slug and annular flows in microchannels. These problems are of great interest for technology applications such as the cooling of microelectronic devices. The employed formulation, the interface representation, bubble-wall modeling and some initial results of this Ph.D. thesis will be presented for 2-dimensional cartesian and axisymmetric cylindrical coordinates.

CV resumido do autor:
After finishing high-school in Brussels (Belgium), Erik Gros went to study Mechanical Engineering at the RWTH Aachen (Germany) university. He obtained his Bachelor degree in February 2013 and his Master degree in October 2014. During his studies he had a strong link with Numerical Simulation and Fluid Dynamics. In the Bachelor project, Gros compared the simulation results of a viscoelastic Poiseuille flow to its analytical solution. In the Master thesis he implemented a moving grid method in a finite volume flow solver. He is currently a Ph.D. student at the Heat and Mass Transfer Laboratory (LTCM) of the Swiss Federal Institute of Technology in Lausanne (EPFL) under supervision of Prof. John. R. Thome and Prof. Gustavo Anjos from the State University of Rio de Janeiro (UERJ). His field of research is numerical simulation of two-phase flows in microchannels where surface tension effects are dominant.

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THERMOCAPILLARY MIGRATION OF BUBBLES IN MICROCHANNELS USING SELF-REWETTING LIQUIDS

Robson Nazereth - University of Edinburgh

Resumo:
A 2D two-phase DNS model has been developed in Ansys CFX. The governing equations are solved numerically via the _nite-volume method. The volume fraction and interface were modelled employing the volume-of-uid (VOF) method with a compressive differencing scheme and the surface tension force is modelled using the Continuum Surface Force (CSF) formulation. The model is used to investigate thermocapillary migration of bubbles in microchannels subject to temperature gradients using self-rewetting fuids. Self-rewetting liquids present a non-linear (parabolic) temperature dependence of surface tension that create a distinct bubble behaviour compared with pure liquids like water that has a linear dependence. Bubble dynamics using self-rewetting liquids in microchannels is the focus of this work and some preliminary results will be presented.

CV resumido do autor:
Robson Nazareth graduated in Physics at Universidade Federal do Rio Grande do Sul in 2011. In 2013 he obtained a master in Physics at Theoretical and Computational Models Group at the same university with a CNPq fellowship. Since 2014 he is a PhD student with a Science without Borders fellowship at Complex Fluids and Multiphase Flows Group at The University of Edinburgh as part of the ThermaPower consortium. Currently he is working with modelling of bubble ow in microchannels.

 

 

Depto(s) ou Orgãos da FEN-UERJ relacionado(s) com esta notícia


phoenix - Incubadora de Empresas Phoenix
ppgem - Pós-graduação em Engenharia Mecânica
mecan - Depto. de Eng. Mecânica


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