Momentum Flux
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. A Statistical Dynamic Model for the Turbulent Transport of Kinetic Energy in Shear Layers
ABSTRACT: Dynamic statistical equations for the turbulent fluxes of scalars and momentum in incompressible flows are derived after time wise integration of the equation for the oscillating transported property, decomposing the turbulent fluxes in terms representing distinct features of the main and fluctuating flow that influence the respective turbulent tra
J. Aerosp. Technol. Manag.. Publicado em: 07/06/2018
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2. Thermodynamic bounds for existence of normal shock in compressible fluid flow in pipes
Abstract The present paper is concerned with the thermodynamic theory of the normal shock in compressible fluid flow in pipes, in the lights of the pioneering works of Lord Rayleigh and G. Fanno. The theory of normal shock in pipes is currently presented in terms of the Rayleigh and Fanno curves, which are shown to cross each other in two points, one corresp
An. Acad. Bras. Ciênc.. Publicado em: 2017-06
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3. NOVEL SIMILARITY-SOLUTION WHICH IS APPLICABLE FOR FREE CONVECTION OVER A BODY OF ARBITRARY SHAPE: THERMAL NON-EQUILIBRIUM IN A POROUS MEDIUM
Abstract The study of the natural convection flow and heat transfer from hot surfaces in a porous medium has been of considerable interest in energy-related engineering problems. This paper is concerned with the free convection heat transfer over an arbitrary hot surface in a porous medium. It is assumed that the fluid and solid phases are not in local therm
Braz. J. Chem. Eng.. Publicado em: 2015-03
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4. SIMULATION OF INTERMITTENT FLOW IN VERTICAL PIPES USING THE TWO-FLUID MODEL WITH DIFFERENT CLOSURE PARAMETERS / SIMULAÇÃO DO REGIME INTERMITENTE EM TUBULAÇÕES VERTICAIS UTILIZANDO O MODELO DE DOIS FLUIDOS COM DIFERENTES RELAÇÕES DE FECHAMENTO
Intermittent two phase flows are characterized by a succession of liquid slugs separated by bubbles of different sizes, with varying frequency. The prediction of this type of flow is very important, since it can be found in several industrial applications. In the present work, studies of intermittent flows in vertical pipes are performed, employing the Two F
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/09/2012
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5. Impacto do efeito da quebra de ondas oceânicas na estrutura da camada limite atmosférica / Impact of effect of the break ocean waves in the atmospheric boundary layer structure
Neste trabalho foi construído um modelo numérico unidimensional de Camada Limite Planetária (CLP), com a Camada de Limite Superficial (CLS) segundo a teoria de similaridade e os coeficientes de difusividade extrapolados até o topo da CLP. Os processos físicos do arrasto das ondas e da pulverização na atmosfera foram implementados no modelo, com o intu
Publicado em: 2009
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6. Impacto do efeito da quebra de ondas oceânicas na estrutura da camada limite atmosférica / Impact of effect of the break ocean waves in the atmospheric boundary layer structure
Neste trabalho foi construído um modelo numérico unidimensional de Camada Limite Planetária (CLP), com a Camada de Limite Superficial (CLS) segundo a teoria de similaridade e os coeficientes de difusividade extrapolados até o topo da CLP. Os processos físicos do arrasto das ondas e da pulverização na atmosfera foram implementados no modelo, com o intu
Publicado em: 2009
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7. Estudo da permeação de hidrogênio em reator com membrana de paládio: modelagem matemática e simulação computacional
Hydrogen is the simplest and most common element in the universe. Currently, some industries use hydrogen to refine oil, and to produce ammonia and methanol. Since the combustion of hydrogen produces only water and energy, it is considered to be viable and environmentally safe. Most of the hydrogen produced in industrial scale is by the steam reforming proce
Publicado em: 2009
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8. Um estudo numérico sobre a transferência de calor na camada limite turbulenta
The present work is a numerical study on the applicaion of analogies between heat and momentum difusion as a methodology to impose heat flux boundary conditions in turbulent boundary layer flows. In order to validate the proposed methodology the following cases were tested: a) a study of turbulent flows over slightly heated flat plates and with unheated star
Publicado em: 2009
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9. Theoretical-experimental study on two-dimentional confined jets. / Estudo teórico-experimental de jatos bi-dimensionais confinados.
The main objective of this thesis is to study the mean flow inertial and pressure effects on the mean flow itself in two-dimensional confined jets. The flows considered in the present work are turbulent, isothermal, incompressible and single-fluid. The introduction and the bibliographical review are done by the following presentations: technological and fund
Publicado em: 2009
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10. Inclusion of the momentum perturbation in the kain-fritsch cumulus parameterization scheme and impacts on a convective rain case / Inclusão da perturbação de momentum no esquema de parametrização de cumulus kain-fritsch e impactos sobre um caso de chuva convectiva
The objective of this work is to insert the vertical transport of momentum through the mass flux in the Kain-Fritsch convective parameterization scheme. The momentum fluxes were inserted in the KF scheme in a similar way to the existing heat fluxes. Experiments were accomplished in the two domains, one experiment with cloud updraft (FM1) and one experiment i
Publicado em: 2007
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11. Investigation of gravity wave momentum fluxes in the upper atmosphere derived from airlow / Investigação do fluxo de momento das ondas de gravidade na alta atmosfera através da aeroluminescência
In this study, momentum fluxes due to gravity wave propagation into the MLT region was calculated by using airglow image data and theoretical modeling. Airglow O(1S) 557,7, O2(0-1,b) and OH NIR images were obtained from Cachoeira Paulista (22,7°S; 45,0°W) and São João do Cariri (7,4°S; 36,6°W) and processed for estimation of gravity wave intrinsic para
Publicado em: 2007
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12. Relativistic jets and accretion phenomena associated with galactic and extragalactic black holes
More than a dozen binary star systems hosting stellar-mass black holes have been discovered in our galaxy. Some of them eject collimated relativistic jets with apparent velocities larger than the light speed. These objects have been named microquasars thanks to their similarity with the distant quasars or active nuclei of galaxies that host supermassive blac
Brazilian Journal of Physics. Publicado em: 2005-12