Orthogonal Collocation Method
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. HIGHLY-ACCURATE MODEL ORDER REDUCTION TECHNIQUE ON A DISCRETE DOMAIN
Abstract In this work, we present a highly-accurate technique of model order reduction applied to staged processes. The proposed method reduces the dimension of the original system based on null values of moment-weighted sums of heat and mass balance residuals on real stages. To compute these sums of weighted residuals, a discrete form of Gauss-Lobatto quadr
Braz. J. Chem. Eng.. Publicado em: 2015-09
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2. A modified orthogonal collocation method for reaction diffusion problems
A low-order collocation method is often useful in revealing the main features such as concentration and temperature profiles and the effectiveness factor for porous catalyst particles. Two modifications are introduced in this paper to make the method more efficient. The first modification is to add an extra collocation point at the center of the particle. It
Braz. J. Chem. Eng.. Publicado em: 2014-12
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3. Modelagem e simulação da secagem de frutos de café em um secador de bandejas vibradas
A Faculdade de Engenharia Química da Universidade Federal de Uberlândia vem desenvolvendo estudos de expressão na área de secagem dos frutos do café utilizando secador de bandejas vibradas com reciclo. Dentre os trabalhos desenvolvidos destaca-se o de Sfredo (2006), que fez o estudo da dispersão do fruto de café no secador descrito inicialmente. Os da
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/10/2011
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4. Discretisation of the non-linear heat transfer equation for food freezing processes using orthogonal collocation on finite elements
The freezing process is considered as a propagation problem and mathematically classified as an "initial value problem." The mathematical formulation involves a complex situation of heat transfer with simultaneous changes of phase and abrupt variation in thermal properties. The objective of the present work is to solve the non-linear heat transfer equation f
Brazilian Journal of Chemical Engineering. Publicado em: 2007-09
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5. Concentration of alpha-lactalbumin from cow milk whey through expanded bed adsorption using a hydrophobic resin
The design of novel applications for the use of new high-density adsorbents in the direct recovery of proteins requires analysis of the fluid dynamics and mass transfer characteristics of the column used with the solid-liquid system. In this article we describe the operating parameters related to the use of a high-density, hydrophobic resin (Streamline® Phe
Brazilian Journal of Chemical Engineering. Publicado em: 2005-12
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6. Modelagem e otimização do processo de liofilização : aplicação para leite desnatado e cafe soluve
Freeze drying is a separation process based on the sublimation phenomenon. This process has the following advantages compared to the conventional drying process: the material structure is maintained, moisture is removed at low temperature (reduced transport rates), product stability during storage is increased, the fast transition from moisturized product to
Publicado em: 2004
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7. Modelagem e analise de digestores Kraft descontinuo
Global1y, the Kraft pulping process is beginning to get use of the benefits of the recent developments in the modeling area and process control. Advanced techniques of simulation and control offer tools that allow the analysis and efficient design of multivariable non-linear process, involving the optimization and the advanced control of the process. The pul
Publicado em: 2004
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8. Modelos hibridos de colunas de destilação
Techniques like online process optimization and model predictive control require fast simulations of the process models used. However, in some cases the process models are very complex or have a high dimension. In these cases acceleration techniques that include order reduction and model simplification can be used to obtain fast enough simulations. Distillat
Publicado em: 2002
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9. A moving boundary problem and orthogonal collocation in solving a dynamic liquid surfactant membrane model including osmosis and breakage
A dynamic kinetic-diffusive model for the extraction of metallic ions from aqueous liquors using liquid surfactant membranes is proposed. The model incorporates undesirable intrinsic phenomena such as swelling and breakage of the emulsion globules that have to be controlled during process operation. These phenomena change the spatial location of the chemical
Brazilian Journal of Chemical Engineering. Publicado em: 2001-06
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10. Controle avançado de um reator quimico de leito fixo : aplicação para oxidação do etanol a acetaldeido
The use of fixed bed catalytic reactors in the chemical industry, and the necessity of controlling and optimizing these reactors, have motivated the studies of dynamic models and control techniques, such as the use of Feedback-Feedforward controllers, working simultaneously. In practice, several feedforward control systems are implemented using ratio control
Publicado em: 2001
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11. Modelagem matematica e simulação numerica de um sistema reacional composto por reatores tipo tanque agitado e tubular em processos de polimerização
The present work consists of a mathematical modeling and numerical simulation of a solution polymerization reaction, using as study case the polystyrene. The reaction system is composed by a continuous stirred tank reactor (CSTR) for prepolymerization, associated in series with a tubular reactor to carry out the reaction until high conversion values. A simpl
Publicado em: 2001
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12. Desenvolvimento de modelos estruturados alternativos para o processo de produção de etanol
Compared with growing studies of microorganism populations, few improvements on the development of structured models for product formation have appeared. The objective of the presenting work is the development of altemative dynamic structured models adapted from structured growth models for the ethanol production by fermentation accomplished on a high produc
Publicado em: 2001