Peclet Number
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. TRANSPORT PARAMETERS OF POTASSIUM FROM DIFFERENT SOURCES IN SOIL COLUMNS
ABSTRACT This study aimed to determine some transport parameters of potassium in soil columns by miscible displacement of effluent from a Sewage Treatment Plant (STP). This effluent was collected at different stages of treatment, and potassium chloride solutions were prepared with the same K pulse concentration as the effluent. They were used to conduct a mi
Eng. Agríc.. Publicado em: 2018-01
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2. NUMERICAL RESEARCH ON THE THREE-DIMENSIONAL FIBER ORIENTATION DISTRIBUTION IN PLANAR SUSPENSION FLOWS
Abstract To describe flow-induced fiber orientation, the Fokker-Planck equation is widely applied in the processing of composites and fiber suspensions. The analytical solution only exists when the Péclet number is infinite. So developing a numerical method covering a full range of Péclet number is of great significance. To accurately solve the Fokker-Plan
Braz. J. Chem. Eng.. Publicado em: 2017-01
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3. Finite volume simulation of 2-D steady square lid driven cavity flow at high reynolds numbers
In this work, computer simulation results of steady incompressible flow in a 2-D square lid-driven cavity up to Reynolds number (Re) 65000 are presented and compared with those of earlier studies. The governing flow equations are solved by using the finite volume approach. Quadratic upstream interpolation for convective kinematics (QUICK) is used for the app
Braz. J. Chem. Eng.. Publicado em: 2013-12
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4. The asymptotic solutions for boundary value problem to a convective diffusion equation with chemical reaction near a cylinder
The work deals with a boundary value problem for a quasilinear partial elliptical equation. The equation describes a stationary process of convective diffusion near a cylinder and takes into account the value of a chemical reaction for large Peclet numbers and for large constant of chemical reaction. The quantity the rate constant of the chemical reaction an
Lat. Am. j. solids struct.. Publicado em: 2013-01
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5. Modelling of displacement washing of packed bed of fibers
The mechanism of displacement washing of packed bed of porous, compressible and cylindrical particles, e.g., fibers, is presented with the help of an axial dispersion model involving Peclet number (Pe) and Biot number (Bi). Bulk fluid concentration, intra-pore solute concentration and concentration of solute adsorbed on the fiber surface are taken to be the
Brazilian Journal of Chemical Engineering. Publicado em: 2009-06
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6. Boundary layer thickness of cylinders and plane surfaces immersed in packed beds in alignment with the flow
In this work, boundary layer development was investigated for a mass transfer process between a moving fluid and a slightly soluble cylinder or plane surface buried in a packed bed, in alignment with the direction of flow. The bed of inert particles is taken to have uniform voidage. For this purpose, numerical solutions of the partial differential equations
Brazilian Journal of Chemical Engineering. Publicado em: 2009-03
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7. Estudo da dispersão na secagem de frutos de café em secador de bandejas vibradas
Para estudar a dispersão dos frutos de café durante a secagem, utilizou-se um secador de bandejas vibradas com reciclo. O secador consiste basicamente de quatro seções: túnel vertical de secagem, sistema de vibração, sistema de injeção de ar aquecido no túnel de secagem e sistema de reciclo dos frutos de café. O túnel de secagem contém quatro ba
Publicado em: 2006
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8. Characterization and recovery of alfa and beta amylases enzymes by expanded bed adsorption systems / Caracterização e recuperação das enzimas alfa e beta - amilases em sistema de adsorção em leito expandido
Aiming to development of new technologies, in this work a and b-amylases recovery from maize (Zea mays) malt by expanded bed adsorption (EBA) was studied in order, to aggregate value to the maize culture which is diffused into our Country. Thus, the optimization of the manufacture steps of maize malt, since the germination (changing the time) until the dryin
Publicado em: 2006
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9. Experimental dynamic evaluation of three-phase reactors
The hydrodynamic parameters were determined for two different three-phase systems (fluidized-bed and trickle-bed) through the experimental evaluation of the dynamic residence time distribution in the gas or liquid phase. For different fluid phase flow rates the fluidized-bed system was operated with a tracer in the gas phase and in the trickle-bed with a tra
Brazilian Journal of Chemical Engineering. Publicado em: 2005-09
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10. Sensitivity computations using first and second orders perturbative methods for the advection-diffusion-reaction model of pollutant transport
This work aims to apply the disturbance theory to accomplish sensitivity computations in problems of pollutant transported in liquid media modeled through the advection-diffusion-reaction equation. The numerical solution of the differential equation that describes the behavior of the system was found via the SUPG ("Streamline Unwinding Petrov Galerkin") fini
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-03
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11. A COMPARISON OF DIFFERENT MODELING APPROACHES FOR THE SIMULATION OF THE TRANSIENT AND STEADY-STATE BEHAVIOR OF CONTINUOUS EMULSION POLYMERIZATIONS IN PULSED TUBULAR REACTORS
Dynamic mathematical models are developed to simulate styrene emulsion polymerization reactions carried out in pulsed tubular reactors. Two different modeling approaches, the tanks-in-series model and the axial dispersion model, are compared. The models developed were validated with experimental data from the literature and used to study the dynamics during
Brazilian Journal of Chemical Engineering. Publicado em: 2002-03
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12. Oxidação umida catalitica da lignina em reatores trifasicos com produção de aldeidos aromaticos
The lignocellulosic material, representing the largest natural renewable resource, occurring in the plants under the cellulose form, hemicellulose, lignin and extractive, with the lignina corresponding about 30% of this total one. The routes of lignin chemical processing, with prominence for the oxidations processes, with the objective of vanilin production,
Publicado em: 2001