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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.1995.tde-09042024-074354
Document
Author
Full name
Guillermo Vilalta Alonso
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1995
Supervisor
Committee
Ortiz, Jayme Pinto (President)
Nogueira, Antonio Augusto dos Santos
Tavares, Miriam Rocchi
Title in Portuguese
Análise da redução de atrito em escoamentos por adição de polímeros: ensaios experimentais com soluções de poliacrilamida.
Keywords in Portuguese
Atrito
Abstract in Portuguese
Neste trabalho e analisada a redução de atrito (ra) causada por soluções poliméricas (água e poliacrilamida) de iqapol pa de peso molecular '1.7.10 POT.6' em um escoamento turbulento em tubulação de pvc de 102.95mm de diâmetro interior. Devido à adição do polímero, verifica-se uma diminuição dos coeficientes de perda de carga f e de atrito 'C IND.F', diminuição esta da ordem de 30% para valores de re='5.10 POT.5' e concentração maior que 70ppm. Apresenta-se uma equação para determinar f como uma função do número de Reynolds e da concentração com diferenças médias na faixa de 7-9% com relação aos dados experimentais. Determinou-se que durante os ensaios, não existe influencia da degradação mecânica do polímero. Os pontos referidos ao inicio da ra foram obtidos por extrapolação gráfica, não sendo possível obter elementos para a análise da assintota de máxima redução de arrasto (amra). Fez-se uma avaliação a equação de vortinskaya, da literatura, sendo que a diferença desta, com os resultados experimentais e com os resultados da equação proposta neste trabalho, estão em uma pequena faixa de erros ( 10%). Comprovou-se que, nas faixas dos ensaios realizados, a correlação geral de tam não e valida. Pelos resultados obtidos pode-se concluir que o iqapol pa e um redutor de arrasto médio para as condições estudadas.
Title in English
Untitled in english
Keywords in English
Friction
Abstract in English
In this work was analysed the drag reduction caused by polymeric solutions (water and polyacrilamide) of IQAPOL PA with a molecular weight of 1,7.106 in a turbulent flow within a P.V.C tube with an inner diameter of 102.95 mm. Due to polymer addition, a diminishment on both head loss and drag coefficients (f and Cf, respectivelly) was verified. For values of Re = 5.105 and concentration higher than 70 ppm, this diminishment was within range of 30%. It is presented an equation for the determination of f, as a function of Reynolds number and concentration with average diferences within the range of 7-9% as regarded to the experimental data. During the experiments it was determined that there are no influence in the results from the polymer mechanical degradation. The points referred to the onset of drag reduction were obtained by means of graphical extrapolation. It was not possible to obtain elements for the analysis of the Maximum Drag Redution Assymptote (M.D.R.A.). From the literature, Vortinskayas equation was estimated, The diferences between the results obtained by this equation and either the experimental results or the results from the presente work proposed equation, were roughly around 10% within the range of the experiments developed here. It was confirmed that the Tams general correlation was not valid. As far as the results obtined here are concerned, it can be concluded that IQAPOL PA is a médium grag reductor under the studied conditions.
 
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Publishing Date
2024-04-09
 
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