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ITs in engineering education: joining efforts between SPEE and IGIP
Williams, Bill; Neto, Pedro; Cardoso, Alberto; Carvalho, Carlos Vaz de; Magalhães, Fernão de; Rasteiro, M. Graça; Restivo, Maria TeresaThe International Society for Engineering Education (IGIP) and The Portuguese Society for Engineering Education (SPEE), the first being the oldest European Society for Engineering Education in Europe and the second the very young Society for Engineering Education in Portugal, have been intensifying the collaboration between the two societies as well as the exchange and dissemination of information about their r...
Modeling the Turbulent Flow of Pulp Suspensions
Ventura, Carla A.F.; Garcia, Fernando A.P.; Ferreira, Paulo J.; Rasteiro, M. GraçaPulp fiber suspensions are complex systems because the components present singular and complex interactions between them. A mechanistic model for the turbulent flow regime of industrial pulp suspensions was developed on the basis of a CFD code, using the chemical engineering module of COMSOL Multiphysics software. The standard k-ε turbulence model, chosen to simulate turbulence, was tested and validated using f...
Use of New Branched Cationic Polyacrylamides to Improve Retention and Drainage ...
Antunes, Elisabete; Garcia, Fernando A. P.; Ferreira, Paulo; Blanco, Angeles; Negro, Carlos; Rasteiro, M. GraçaCationic polyacrylamides of very high molecular weight and with different charge densities and degrees of branching have been investigated as retention aids for papermaking. The effects of polymer charge density and polymer branching on drainage and retention of a suspension containing fibers and precipitated calcium carbonate have been correlated with flocs properties. Additionally, the effects of flocculant d...
Effect of Water Cationic Content on flocculation, flocs resistance and refloccu...
Antunes, Elisabete; Garcia, Fernando A. P.; Ferreira, Paulo; Blanco, Angeles; Negro, Carlos; Rasteiro, M. GraçaIn papermaking, mill water closure may result in a significant increase of inorganic salts in the white water. The effect of these contaminants on the performance of retention aids was evaluated, in this study, through flocculation of Precipitated Calcium Carbonate (PCC) with three very high molecular weight cationic polyacrylamides (C-PAM) of medium charge density and with different degrees of branching. Furth...
Mass Calibration of the Coulter Counter Model ZM
Figueiredo, M. Margarida; Rasteiro, M. Graça; Santos, Cristina; Monteiro, CristinaThe calibration of electrical sensing zone instruments is normally achieved by using spherical particles with a certified size. An alternative and more fundamental procedure, known as mass or self-calibration, is to use particles of the material under test.This work concerns the mass calibration technique, in particular the equations used to calculate the mass calibration constant. It is demonstrated that some ...
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