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Heat transfer coefficients from Newtonian and non-Newtonian fluids flowing in l...
Pimenta, Teresa Araújo; Campos, J. B. L.This study aimed to carry out experimental work to obtain, for Newtonian and non-Newtonian fluids, heat transfer coefficients, at constant wall temperature as boundary condition, in fully developed laminar flow inside a helical coil. The Newtonian fluids studied were aqueous solutions of glycerol, 25%, 36%, 43%, 59% and 78% (w/w) and the non-Newtonian fluids aqueous solutions of carboxymethylcellulose (CMC), a ...
Friction losses of Newtonian and non-Newtonian fluids flowing in laminar regime...
Pimenta, Teresa Araújo; Campos, J. B. L.This study aimed to carry out experimental work to determine, for Newtonian and non-Newtonian fluids, the friction factor (fc) with simultaneous heat transfer, at constant wall temperature as boundary condition, in fully developed laminar flow inside a vertical helical coil. The Newtonian fluids studied were aqueous solutions of glycerol, 25%, 36%, 43%, 59% and 78% (w/w). The non-Newtonian fluids were aqueous s...
Flow around individual Taylor bubbles rising in stagnant CMC solutions: PIV mea...
Sousa, R. G.; Riethmuller, M. L.; Pinto, A. M. F. R.; Campos, J. B. L. M.The flow around single Taylor bubbles rising in non-Newtonian solutions of Carboxymethylcellulose (CMC) polymer was studied using simultaneously particle image velocimetry (PIV) and shadowgraphy. This technique made it possible to determine the correct position of the bubble interface. Solutions of polymer with weight percentage varying from 0.1 to 1.0 wt% were used to cover a wide range of flow regimes. The Th...
Simultaneous PIV and pulsed shadow technique in slug flow: A solution for optic...
Nogueira S.; Sousa R. G.; Pinto A. M. F. R.; Riethmuller M. L.; Campos J. B. L. M.A recent technique of simultaneous particle image velocimetry (PIV) and pulsed shadow technique (PST) measurements, using only one black and white CCD camera, is successfully applied to the study of slug flow. The experimental facility and the operating principle are described. The technique is applied to study the liquid flow pattern around individual Taylor bubbles rising in an aqueous solution of glycerol wi...
Axial dispersion of particles in a slugging column-the role of the laminar wake...
Cardoso O. N.; Pinto A. M. F. R.; Campos J. B. L. M.Axial solid dispersion promoted by Taylor bubbles in a batch liquid column was studied. A mechanistic model was developed to predict the axial solid dispersion. The model is based on the upward transport of particles inside closed wakes of non-interacting Taylor bubbles. The model predictions are compared with experimental data. The experimental data were obtained in a test tube of 32 mm internal diameter. The ...
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