Head Losses
Mostrando 13-24 de 38 artigos, teses e dissertações.
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13. Otimização do corte de pontas de um aço livre de intersticiais laminado a quente usando tesoura do tipo guilhotina / Optimization the cut edge of a hot rolled interstitial free steel using a guillotine type shearing machine
The automotive industry\ s demand for high formability steels for use in exposed body panels motivated the development of several interstitial free (IF) steels specifications at Companhia Siderurgica Nacional. The \"IF-Ti\" steel specification belongs to the special deep drawing steels group (CSN EEP-IF), with yield strength <380 MPa, and among all grades of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/02/2011
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14. Perda localizada de carga em conectores utilizados em microirrigação / Local head losses in the connectors used in microirrigation
As perdas localizadas de carga são elementos frequentemente negligenciados em dimensionamento de sistemas de irrigação, afetando a uniformidade de aplicação de água. Algumas peças acessórias não possuem equações que estimem estas perdas de forma simples e eficiente. Este trabalho foi desenvolvido com o objetivo de ajustar uma equação que estime
Publicado em: 2011
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15. Análise de criticidade de descontinuidade em um bocal de um vaso de pressão
Pressure vessels and pipes are essential equipment in the chemical, petrochemical, petroleum refining, among others. The safety operation of this equipment is an important aspect, since failures can vary from large financial losses to catastrophic consequences. Evaluation discontinuity found in inspections can be perfomed by fitness for service methodology w
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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16. Modelagem e controle de microturbina a gás do tipo split-shaft. / Modeling and control of slip-shaft gas microturbine.
The objective of the present work is the development of the model of a split-shaft micro gas turbine with feed back control system. A bibliographical review of the works on control of gas turbines indicated that there are very few works dealing this type of gas turbines. The model was developed starting from the basic geometry of the turbine and applying the
Publicado em: 2010
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17. ReaÃÃo de resistÃncia à giberela em cultivares de trigo (Triticum aestivum L.), avaliada em condiÃÃes de campo e casa de vegetaÃÃo / Reaction of resistance to FHB in wheat cultivars (Triticum aestivum L.) evaluated under field and greenhouse conditions
Caused by several species of fungus, fusarium head blight (FHB) is a disease of great economic importance in wheat (Triticum aestivum L.), causing large losses in world grain production. In Brazil the main species of fungi responsible for disease is Gibberela zeae (Schwabe.), and its the anamorphic Fusarium graminearum (Schwabe). The control by chemical trea
Publicado em: 2010
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18. Avaliação da funcionalidade do ombro, dor e qualidade de vida em pacientes submetidos a esvaziamento cervical e a resposta ao protocolo de reabilitação fisioterápica / Evaluation of the shoulder function, pain and quality of life in patients undergone neck dissection and results of a physiotherapic rehabilitation protocol
Neck dissection is the treatment of head and neck cancer patient in whom the shoulder is at risk for changes related to the procedure. The postoperative morbidity is directly related with the surgery, which can be associated with displacement of flaps and resection of tissue and neuromuscular structures. The disease in this region has sufficient potential to
Publicado em: 2009
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19. Perda localizada de carga em gotejadores integrados em tubos de polietileno / Local head losses for integrated drippers in polyethylene pipes
A inserção de gotejadores em uma tubulação modifica as linhas de fluxo, provocando turbulência local, que resulta em perdas de carga adicionais maiores que as perdas contínuas na tubulação. Para avaliar a perda total de carga, ao longo da linha lateral de gotejadores, as perdas contínuas e as localizadas, devidas à presença dos emissores no tubo,
Publicado em: 2009
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20. Metodologia para determinação da perda de carga localizada em emissores não coaxiais integrados a tubos de polietileno / Methodology for Localized head loss determination of non coaxial emitters inserted in polyethylene pipe
The design of a lateral line of trickle irrigation requires an accurate evaluation of head losses in not only the pipe but the emitters as well. A procedure was developed to determine localized head losses within the emitters by the formulation of a mathematical model accounting for the obstruction caused by the insertion point. These localized losses can be
Publicado em: 2008
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21. Morfologia, consequências do ataque de Lampetis nigerrima (Kerremans, 1897) (Coleoptera: Buprestidae) e poda de correção em clone de eucalipto / Morphology and damage of Lampetis nigerrima (Kerremans, 1897) (Coleoptera: Buprestidae), and pruning effect on cloned eucalypts
Two works were developed; the first objective was to find out important characters to be used in the identification of Lampetis nigerrima (Kerremans, 1897). Field activities were carried out in a commercial eucalypt plantation of cloned hybrid (Eucalyptus grandis vs E. urophylla), in the Grão Mogol County, Minas Gerais State, Brazil. Lab works were develope
Publicado em: 2008
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22. Laminar elliptic flow in the entrance region of tubes
The developing region of an axially symmetric laminar flow from a reservoir to a sharp-edged tube is numerically simulated with a primitive-variables solver of the Navier-Stokes equations, using a plenum upstream of the tube inlet in order to avoid arbitrary specification of the profile at the inlet. Development region lengths, velocity profiles and head los
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-09
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23. Índice geométrico na determinação da perda de carga localizada em conexão de emissores sobre tubos de polietileno de pequenos diâmetros / Geometrical Index in the determination of head losses located in connection of emitters on polyethylene pipes of small diameters
O procedimento de dimensionamento de uma linha lateral de microirrigação necessita avaliar com precisão as perdas de carga distribuídas na tubulação e as perdas de carga localizadas nas inserções dos emissores com os tubos. Estas perdas localizadas podem ser significativas quando comparadas com as perdas de carga totais, devido ao grande número de e
Publicado em: 2007
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24. Analysis of the optimal location of pressure reducing valves in water distribution systems considering multiple objectives / Estudo ótimo da localização de válvulas redutoras de pressão em sistemas de distribuição de água considerando objetivos múltiplos
In Brazil, water distribution systems with high leakage levels represent a problem with multiple implications for water utilities. Leakage, which accounts for the dominant component of water losses, produces negative effects from the economical, as well as from the operational perspectives: increase in pumping energy, compromise of water quality, increase in
Publicado em: 2007