Two Phase Jet
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. SELF-SIMILARITY OF VERTICAL BUBBLY JETS
AbstractAn integral model for vertical bubbly jets with nearly monodisperse bubble sizes is presented. The model is based on the Gaussian type self-similarity of mean liquid velocity, bubble velocity and void fraction, as well as on functional relationships for initial liquid jet velocity and radius, bubble diameter and relative velocity. Adjusting the model
Braz. J. Chem. Eng.. Publicado em: 2015-06
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2. Eulerian-lagrangian simulation of a turbulent evaporating spray
This work consists in a numerical simulation of a spray jet: a two-phase flow composed by a gaseous and a liquid phase. The gaseous phase is treated as a continuous medium, and the liquid phase is treated as a dispersed phase. An asymptotic approximation of zero Mach number was applied to the gaseous phase in order to account for density variations due to te
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/11/2011
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3. Evaluation of dental enamel before and after fixing and removal of orthodontic brackets ortodônticos / Avaliação do esmalte dentário antes e após a colagem e descolagem de braquetes ortodônticos
The objective of this study was to evaluate the quantity of residual resin after removal of brackets and the loss and//or wear-and-tear of enamel occurring during the phases of fixing, detaching and removal of remnant resin in the bracket area and its adjacent. The sample was made up of 150 premolars, divided into two groups in accordance with the type of br
Publicado em: 2009
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4. Analise de estruturas coerentes de larga escala em jatos de dispersão bifasicos / Large scale coherent structures analysis in two-phase jets
A study of large scale coherent structures by Interparticle Arrival Time (IAT) of a two phase jet flow is proposed. Measurements were carried out for different initial velocities with 50 µm particle mean diameter, and for two different particle mixtures with mean particle diameter of 50 µm and 90 µm, in different proportions, and analyzed in relation to d
Publicado em: 2008
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5. Solução numérica em jatos de líquidos metaestáveis com evaporação rápida. / Numerical solution in jet of liquid superheat with rapid evaporation.
Este trabalho estuda o fenômeno de evaporação rápida em jatos de líquidos superaquecidos ou metaestáveis numa região 2D. O fenômeno se inicia, neste caso, quando um jato na fase líquida a alta temperatura e pressão, emerge de um diminuto bocal projetando-se numa câmara de baixa pressão, inferior à pressão de saturação. Durante a evolução do
Publicado em: 2008
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6. Influence of a lipid phase on steam jet agglomeration of maltodextrin powders / Estudo da influencia de uma fase lipidica na aglomeração de pos alimenticios
Agglomeration involves the production of larger and stable particles by aggregation of fine particulated material, in order to enhance flowability, appearance and reconstitution in water. This work evaluated the contribution of an oil phase on the agglomeration mechanisms of food powders. Three different palm oil fractions (two oleins with melting point of 1
Publicado em: 2006
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7. Estagnação de massa de ar quente e seco sobre a região central do Brasil / Stagnation of warm and dry air masses in the central region of Brazil
In the Southeast Region, southern parts of Central-West and northern parts of South Regions, Stagnations of Warm and Dry Air Masses (EMAQS) occur between April and September months. They are characterized by positive temperature anomalies and negative precipitation anomalies, persisting for several days. This situation causes an increase in air pollution and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/06/2005
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8. Analise dos resultados da cirurgia da estenose laringotraqueal e traqueal na Unicamp
The trachea surgery presents some peculiarities that becomes it extremely attractive to the thoracic surgeon. The objective of this search is to show and evaluate the results of 68 operated patients by laryngotracheal and tracheal stenosis at the Thoracic Surgery Division at Campinas State University (Unicamp), during the period of November´1979 to August´
Publicado em: 2001
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9. Análise teórico-experimental do escoamento bifásico no interior de bocais nebulizadores do tipo "Y - JET". / Experimental and theoretical analysis of the two-phase flow inside Y-jet atomizers.
In this research work the effects of the process and geometrical parameters on the characteristics of the internal two-phase flow inside eight Y-Jet atomizers were studied using an apparatus working with air and water. The results show that the flow rates are very dependent on the air supply pressure and the diameter ratio of the mixing duct and the air port
Publicado em: 2000
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10. Modelo computacional dinamico lagrangeano - euleriano para escoamento bifasico em poços de petroleo
A new computational model is introduced for describing long-term transient aspects of two-phase vertical flow, focusing the convection phenomenon only. The model uses the concepts ofthe drift-flux model along with specific constitutive relations for bubble, slug and annular flow. The motion of gas is treated with Lagrangean cells, whereas mass and momentum c
Publicado em: 1996
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11. Estudo de otimização das operações com tubo flexivel e nitrogenio
This work presents a study about the flow phenomena in jet-lifting with the purpose to reduce the nitrogen consumption, to maximize the fluid recovery and to reduce the operation time. A column of tests was designed and built, with a external 2.441 in 1D tubing pipe and a internal 1.0 in OD coiled tUbing, simulating the real situation of the jet-lifting oper
Publicado em: 1990
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12. Biocidal Properties of Anti-Icing Additives for Aircraft Fuels
The biocidal and biostatic activities of seven glycol monoalkyl ether compounds were evaluated as part of an effort to find an improved anti-icing additive for jet aircraft fuel. Typical fuel contaminants, Cladosporium resinae, Gliomastix sp., Candida sp., Pseudomonas aeruginosa, and a mixed culture containing sulfate-reducing bacteria were used as assay org