Annular Core
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. New concept of tunnel boring machine: high performance using water jet and diamond wire as rock cutting technology
Abstract Tunnel boring machines are important tools in underground infrastructure projects. Although being well established equipment, these machinesare based on designsof more than 60 years ago and are characterized by big dimensions, enormous weight and high power consumption. Commercial aspects should be noted too. The model adopted by the TBM industry re
REM, Int. Eng. J.. Publicado em: 2018-03
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2. Desenvolvimento de uma técnica de medida de vazão de óleo em escoamento bifásico do tipo core-flow / Development of a technique for measuring the oil flow rate in core-annular flow pattern
Diferentes métodos para exploração dos óleos pesados surgiram nestes últimos anos. Um método que chamou a atenção da indústria foi o método que adiciona água ao escoamento, formando uma película lubrificante que facilita o escoamento deste óleo que pode escoar em diferentes padrões. O padrão considerado mais eficiente em relação à potencia
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/02/2010
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3. Contribution to the study of a non-invasive probe for measuring the water thickness in a core-annular flow / Contribuição ao estudo de um medidor não-invasivo da espessura da camada de agua em um escoamento anular oleo-agua
This work is a contribution to the study of a non-intrusive probe for measurement of the thickness of the water layer of a core-annular flow. A capacitive probe was built and its static performance was evaluated from tests executed in a specially designed bench-scale apparatus. In addition, evaluation of the dynamic performance was made possible from fluid-f
Publicado em: 2010
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4. REDUÇÃO DE ATRITO EM ESCOAMENTO LAMINAR POR LUBRIFICAÇÃO DE PAREDE COM RANHURAS / DRAG REDUCTION IN LAMINAR FLOW BY LUBRICATION OF GROOVED WALLS
Objetivo: Uma parte significativa das reservas mundiais de petróleo é encontrada na forma de óleos pesados. Estes óleos pesados possuem alta viscosidade de 100 - 10000 cP, que torna seu transporte altamente complexo e custoso. Vários métodos foram desenvolvidos para reduzir a perda de carga de escoamentos laminares de óleos de alta viscosidade. Entre
Publicado em: 2009
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5. Gephysical Characterization of the Araguainha impact structure, MT/GO. / Caracterização geofísica da estrutura de impacto de Araguainha, MT/GO
Araguainha is the largest and the best-exposed complex crater of South America, formed in horizontal sediments of the Paraná Basin. Its portentous structure with 40 km in diameter and 25 km of transient cavity reveals a negative contrast of density and magnetic susceptibility in the central uplift. That feature allows to infer a limit of physical property b
Publicado em: 2007
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6. AnÃlise paramÃtrica de um reator anelar pulsado
A new pulsed reactor concept VICHFPR (Very Intense High Continuous Flux Pulsed Reactor) was presented in 1997 as a possible extension of IBR-2 periodically pulsed Russian reactor. The concept has an annular core which is traversed by a reactivity modulator responsible for generating a rotating neutron pulse. While the most part of the core operates under sub
Publicado em: 2006
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7. Anatomical studies of Forsteronia G.Mey. (Apocynaceae) species of cerrado / Estudos anatomicos em especies de Forsteronia G.Mey. (Apocynaceae) de cerrado
The leaf anatomy of four cerrado species of Forsteronia was investigated in order to determine characters that could help to identify individuals collected in vegetative stage. Eleven characters, two macromorphological and nine anatomical, were surveyed and are useful to differ F. australis from F. glabrescens and F. pubescens from F. thyrsoidea. Domatia and
Publicado em: 2006
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8. Forma da interface e gradiente de pressão no padrão liquido-liquido anular vertical ascendente
This investigation describes the upward vertical annular two-phase flow for application on heavy oil production. One of the main problems concerning the exploitation of this kind of crude is the huge friction pressure gradient involved. The technology that has been studied for the very viscous fluid transportation consists in the continuous injection of litt
Publicado em: 2002
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9. Pressure Drop in Vertical Core-Annular Flow
An experimental apparatus for the study of core annular flows of heavy oil and water at room temperature has been set up and tested at laboratory scale. The test section consists of a 2.75 cm ID galvanized steel pipe. Tap water and a heavy oil (17.6 Pa.s; 963 kg/m³) were used. Pressure drop in a vertical upward test section was accurately measured for oil f
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001
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10. 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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11. Estudo experimental do escoamento anular oleo-agua ("core flow") na elevação de oleos ultraviscosos
The increase in importance of heavy oil in the energy scenario makes it viable the exploitation of initially unprofitable reservoirs. This leads to the search of technologies capable to improve the development of heavy oil fields. In view of this scenario the present work proposes a new technology for heavy oil lift by using the core annular flow pattem (sho
Publicado em: 1999
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12. Molecular architecture and mechanism of an icosahedral pyruvate dehydrogenase complex: a multifunctional catalytic machine
Electron cryo-microscopy of ‘single particles’ is a powerful method to determine the three-dimensional (3D) architectures of complex cellular assemblies. The pyruvate dehydrogenase multi-enzyme complex couples the activity of three component enzymes (E1, E2 and E3) in the oxidative decarboxylation of pyruvate to generate acetyl-CoA, linking glycolysis an
Oxford University Press.