Diameter Prediction
Mostrando 25-36 de 74 artigos, teses e dissertações.
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25. Three-dimensional simulation of liquid flow on a sieve tray under different inclinations
The fluid state on a sieve tray will change when the towers tilt under wind loads. A computational fluid dynamics (CFD) model was used to predict the flow patters and hydraulics on the tray under different inclinations. The gas and liquid phases are modelled with the volume-of-fluid (VOF) framework as two inmiscible phases. Several three-dimensional transien
Braz. J. Chem. Eng.. Publicado em: 2014-12
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26. On the prediction of pickup and saltation velocities in pneumatic conveying
This paper presents a comparative study of the critical pickup and saltation velocities of particles in horizontal pipelines for pneumatic conveying design. A comparative study is performed using different existing correlations in the literature for the determination of the minimum velocity of transport as a function of the particle and pipe diameter, partic
Braz. J. Chem. Eng.. Publicado em: 2014-03
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27. Simulação de um alimentador Venturi em trecho ascendente no transporte pneumático de sólidos
The radial and axial distributions of coarse solids when fed directly in a riser are unknown, despite this type of feeding is very important for drying and preheating of solids during conveying. In this context, this thesis focused on studying the diluted conveying of coarse solids in a riser that was fed by a Venturi feeder in vertical orientation. Experime
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/08/2012
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28. Predição recursiva de diâmetros de clones de eucalipto utilizando rede Perceptron de múltiplas camadas para o cálculo de volume
O volume de madeira plantado é uma informação essencial no direcionamento racional e sustentável dos recursos disponíveis nas florestas. Assim, é muito importante quantificá-lo da forma mais precisa possível. A atividade da Engenharia Florestal que trata da quantificação de madeira nas florestas é o Inventário Florestal. Este inventário é a bas
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/04/2012
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29. Experimental study of micro-particle fouling under forced convective heat transfer
Particulate fouling studies of a hydrocarbon based suspension containing 2 µm alumina particles were performed in an annular heat exchanger having a hydraulic diameter of 14.7 mm. During fouling experiments, the classical asymptotical behavior was observed. It is shown that particle concentration, fluid velocity, and wall temperature have strong influences
Braz. J. Chem. Eng.. Publicado em: 2012-12
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30. Introducing a new formula based on an artificial neural network for prediction of droplet size in venturi scrubbers
Droplet size is a fundamental parameter for Venturi scrubber performance. For many years, the correlations proposed by Nukiyama and Tanasawa (1938) and Boll et al. (1974) were used for calculating mean droplet size in Venturi scrubbers with limited operating parameters. This study proposes an alternative approach on the basis of artificial neural networks (A
Braz. J. Chem. Eng.. Publicado em: 2012-09
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31. Gastrosquise fetal isolada: relação entre dilatação intestinal e resultados perinatais adversos / Isolated fetal gastroschisis: relation between bowel dilation and adverse perinatal outcome
Objectives: Evaluate bowel diameter as a predictor of adverse outcome in isolated fetal gastroschisis. Methods: Retrospective study involving 94 singleton pregnancies. Ultrasound measurements of herniated bowel transverse diameter (BTD) were performed up to 3 weeks before delivery. Adverse outcome was intrauterine/ neonatal death and/or bowel complications.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/11/2011
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32. Flooding characteristics in pulsed packed extraction columns
Flooding behavior of a 76.2 mm diameter pulsed packed column has been determined using four different liquid-liquid systems. The effects of pulsation intensity, flow ratio, interfacial tension, and packing geometry on flood point have been investigated. The results showed that the maximum throughput of the column decreases with an increase in pulsation inten
Brazilian Journal of Chemical Engineering. Publicado em: 2011-12
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33. Mass transfer performance in pulsed disc and doughnut extraction columns
Mass transfer performance is presented for a 76 mm diameter pulsed disc and doughnut extraction column for the toluene-acetone-water system. The experiments were carried out for both mass transfer directions. The mass transfer data are interpreted in terms of the axial diffusion model, thus accounting for continuous phase axial dispersion. The effect of oper
Brazilian Journal of Chemical Engineering. Publicado em: 2011-09
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34. Dispersed phase holdup in a pulsed disc and doughnut extraction column
Dispersed phase holdup has been measured in a 76 mm diameter pulsed disc and doughnut extraction column for three different liquid-liquid systems. The effects of operational variables such as pulsation intensity and dispersed and continuous phase flow rates on holdup have been investigated and found to be significant. The existence of three different operati
Brazilian Journal of Chemical Engineering. Publicado em: 2011-06
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35. Prediction of large esophageal varices in cirrhotic patients using classification and regression tree analysis
OBJECTIVES: Recent guidelines recommend that all cirrhotic patients should undergo endoscopic screening for esophageal varices. That identifying cirrhotic patients with esophageal varices by noninvasive predictors would allow for the restriction of the performance of endoscopy to patients with a high risk of having varices. This study aimed to develop a deci
Clinics. Publicado em: 2011
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36. Modelagem matemática na previsão de colheita de bananeira: regressão linear múltipla x redes neurais artificiais / Mathematical modeling to predict crop of banana: multiple regression x neural networks
One of the barriers relevant to the banana crop in Brazil is the lack of productive commercial varieties with adequate size, resistant to major pests and diseases and adapted to different ecosystems. The development of cultivars is the strategy for solving this problem through breeding programs, as well as its characterization and evaluation in areas of prod
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/12/2010