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Previous issue date: 2016-02-16 / Escoamentos turbulentos e laminares s?o encontrados, frequentemente, em diversas aplica??es de engenharia, como em compressores e bombas e ao redor de carros, avi?es e navios. O atrito superficial, grande respons?vel pelas perdas energ?ticas, ? consideravelmente maiores no tipo de escoamento turbulento do que em escoamentos laminares. Seu estudo ? bastante desafiador, devido a sua natureza complexa. A principal justificativa para este estudo baseia-se na otimiza??o dos recursos energ?ticos, por motivos econ?micos principalmente, atrav?s do estudo da redu??o de arrasto induzido por pol?meros. Neste trabalho, ? estudada a redu??o de arrasto por indu??o de pol?meros a partir da utiliza??o de uma bancada experimental situada no laborat?rio de mec?nica dos fluidos da UFRN. A bancada experimental foi constru?da e calibrada exclusivamente para este trabalho. Foram utilizados como aditivos polim?ricos o Polietileno glicol 4000, o Polyox WSR N60K, Polyox WSR 301 e o Polyox WSR 205. A redu??o de arrasto induzida por pol?meros ? investigada a partir da an?lise de um escoamento, tal an?lise parte do princ?pio da medi??o de press?o em dois pontos do escoamento e culmina no c?lculo da perda de carga e do fator de atrito, o que possibilita analisar a influ?ncia da adi??o de pol?meros na redu??o do arrasto em escoamentos sejam eles laminares ou turbulentos. N?o foi observado redu??o de arrasto no polietileno glicol 4000 na concentra??o analisada. O Polyox WSR N60K, o Polyox WSR 301 e o Polyox WSR 205 apresentaram redu??o de arrasto com destaque para o Polyox WSR 301 que apresentou maior redu??o dentre dos pol?meros estudados, o que conclui-se que o Polyox WSR 301 ? mais eficiente para promover a redu??o de arrasto em tubos r?gidos. / The flows turbulent and laminar are present in various applications of engineering and one of the villain of energy loss big is the surface friction. Currently, there are several research aimed for the study of reducing drag (DR) with the objective of developing effective methods to reduce the friction. Regardless of numerous research carried out until today, the phenomenon DR still remains in study not it is fully understood. This paper studied the drag reduction by polymer induction in turbulent internal flows in ducts. We constructed a testing bench to perform the analysis of drag reduction, the bench has basically two manometers with a 8.5 psi full scale, a peripheral pump 0.5 HP, an acrylic tank, valves and tubes pvc and is situated in the Laboratory Fluid Mechanics UFRN. Were used as polymer additives to polyethylene glycol 4000, the Polyox WSR N60K, Polyox WSR 301 and Polyox WSR 205. The rationale for the choice of these polymers is their wide application in situations requiring greater energy efficiency, such as the addition reducing polymers for the jet used by the fire department to achieve greater distances. The induced drag reduction polymers is investigated from the turbulent flow analysis, with Reynolds number in a range between 2?104 ? 5?104. The part of the first pressure measurement analysis on two points of the turbulent flow, then the density measurements, viscosity of the polymer solutions and culminates in drag reduction calculation, allowing to analyze the influence of the addition polymer in reducing the drag in turbulent flows. The Polyox WSR N60K, the Polyox WSR 301 and Polyox WSR 205 decreased drag highlighting the Polyox WSR 301 that showed the greatest reduction among the polymers studied, which concluded that the Polyox WSR 301 is more efficient to drag reduction in pipes. There was no drag reduction in polyethylene glycol 4000 to the measured concentration.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20932 |
| Date | 16 February 2016 |
| Creators | Queiroz, Luiz Paulo de Oliveira |
| Contributors | 12391085400, http://lattes.cnpq.br/7103009428184656, Ferro, Lu?s Mor?o Cabral, 60238455335, http://lattes.cnpq.br/7188981769780401, Bessa, Kleiber Lima de, 01864959436, http://lattes.cnpq.br/3825553608740400, Bessa, Kleiber Lima de, Mendes, Jos? Ubiragi de Lima |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA MEC?NICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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