Um Informativo do Departamento de F?sica da UFPR
- Artigos
- Semin?rios
- Eventos
- Not?cias
- Teses e Disserta??es
- Editais
Artigos
Symmetrical Ball Check-Valve Based Rotation-Sensitive Pump
F. A. da Silva Rahal and C. K. Saul, J. Fluids Eng. 135, 111101 (2013)
doi:10.1115/1.4024561
Semin?rios
Palestrante: Elizaveta Gatapova (Institute of Thermophysics SBRAS, Novosibirsk, Russia)
T?tulo: Heat and Mass Transfer in Two-Phase Cooling Systems
Data: 15/08 (quinta-feira)
Hora: 15h30min
Local: Sala PE04
Resumo:
The study of an evaporating shear-driven liquid film with a localized
heating is motivated by potential application in cooling of
microelectronics on earth and in space. The modeling of evaporating thin
liquid film driven by body force or shear stress is important both from a
practical point of view and as task in investigation of film local dry-out
resulting in formation of apparent contact lines. Two types of models for
shear-driven liquid film with phase transitions have been developed. One
of them is a two-sided model that is capable to evaluate the evaporation
effect on heat transfer enhancement. Some quantitative and qualitative
comparisons with experimental results are presented. The one-sided
mathematical model is also developed in the framework of the lubrication
approximation describing the behavior of contact line. Evaporation, slip,
disjoining pressure, capillarity and shear stresses effects are included
in the model. The effect of the slip condition at the solid-liquid surface
has been examined. An experimental and theoretical study of the
evaporation of a sessile water drop to open atmosphere when the
temperature difference between the solid substrate and the atmosphere is
about 40C are presented. Using substrates with different wettability we
investigate all three modes of droplet evaporation: pinning, partial
pinning and depinning. One of the most important results is that at the
final stage of the drop life the specific evaporation rate abruptly
increases especially for drops with small and moderate contact angle
hysteresis. The coupled heat and mass transfer model is considered where
the temperature field on the drop surface determines the distribution of
vapor concentration on liquid?gas interface. The calculated specific
evaporation rate is in excellent agreement with the experimental data.
Eventos
O Programa de P?s-Gradua??o em F?sica da UFPR realizar? Minicurso,nos dias 26 a 30 de agosto.
Ser? ministrado pelo Prof. Dr. Andr?s Santos da Universidade de Extremadura, Badajoz, Espanha.
T?tulo: "Playing with marbles: structural and thermodynamic properties of hard-sphere systems"
Informa??es: Secretaria da P?s-Gradua??o de F?sica
I? Encontro de F?sicos do Sul, a ser realizado de 24 a 26 de Novembro, em Curitiba. Aqui
12? Encontro Brasileiro de F?sica dos Plasmas de 1 a 5 de Dezembro. Aqui
Not?cias
- Writing and Deleting Single Magnetic Skyrmions. Science 9 August 2013 Vol. 341 no. 6146 pp. 636-639
DOI: 10.1126/science.1240573
Sobre como criar e deletar skyrmions com a inje??o de uma corrente polarizada em spin em um filme
fino ferromagn?tico. Os skyrmions s?o a nova promessa para mais um salto na capacidade de
armazenamento em HDs.
- Radio waves measure atmospheric temperature changes.Method could be used to monitor climate
change in the long run. Aqui
- How do aircraft remain in the sky? Video: Kara Peters on the basic principles of how planes can fly.
- The Utility Of Physics. Aqui
Teses e Disserta??es
Editais
Est?o abertas as inscri??es para o EUF - EXAME UNIFICADO DE P?S-GRADUA??ES EM F?SICA:
Inscri??es: de 05 a 31/08/2013 (para ingresso no 1? Semestre de 2014).
Realiza??o das provas: 15 e 16/10/2013, das 14h ?s 18h (hora de Bras?lia). Aqui
Foram prorrogadas as inscri??es para os programas para professores(as)/pesquisadores(as)
brasileiros em universidades nos Estados Unidos em v?rias ?reas do conhecimento. Fulbright Foundation
N?o perca essa oportunidade! Aqui
Novos artigos, not?cias e informa??es devem ser enviadas ao IDF
(informativo@fisica.ufpr.br) sempre at? sexta-feira.
