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Stresses of PTT, Giesekus, and Oldroyd-B fluids in a Newtonian velocity field near the stick-slip singularity
(Amer Inst Physics, 2017-12-01)
We characterise the stress singularity of the Oldroyd-B, Phan-Thien-Tanner (PTT), and Giesekus viscoelastic models in steady planar stick-slip flows. For both PTT and Giesekus models in the presence of a solvent viscosity, ...
The influence of the mixing time in the rheological behavior of cement pastes
(2008-12-01)
Rheology has the purpose to study the flux and deformation of materials when submitted to some tension or outer mechanical solicitation. In practice, the effective scientific field broached by rheology is restricted only ...
The influence of the mixing time in the rheological behavior of cement pastes
(2008-12-01)
Rheology has the purpose to study the flux and deformation of materials when submitted to some tension or outer mechanical solicitation. In practice, the effective scientific field broached by rheology is restricted only ...
Control of instabilities in non-Newtonian free surface fluid flows
(Abcm Brazilian Soc Mechanical Sciences & Engineering, 2014)
Avaliação reológica experimental do comportamento tixotrópico de uma solução de laponita-RD®
(Universidade Tecnológica Federal do ParanáCuritibaBrasilGraduação em Engenharia MecânicaUTFPR, 2017-12-05)
The present work presents the methodology and results obtained for the study of a thixotropic fluid, Laponita-RD® solution. The objectives of this work were the formulation of a stable solution of the material and the ...
Avaliação das condições hidrodinâmicas, de transferência de oxigênio e de cisalhamento em diferentes modelos e escalas de reatores pneumáticos
(Universidade Federal de São CarlosUFSCarPrograma de Pós-Graduação em Engenharia Química - PPGEQCâmpus São Carlos, 2016-04-26)
Due to the high capacity of oxygen transfer and versatility, pneumatic reactors have been
constantly used in bioprocesses. However, aiming to expand the use of these bioreactors in the industry, as well as increase the ...
Viscosity measurement of Newtonian liquids using the complex reflection coefficient
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2008)
This work presents the implementation of the ultrasonic shear reflectance method for viscosity measurement of Newtonian liquids using wave mode conversion from longitudinal to shear waves and vice versa. The method is based ...
Visualization of viscoplastic fluid flow in an abrupt contraction using particle image velocimetry
(Universidade Tecnológica Federal do ParanáCuritibaBrasilPrograma de Pós-Graduação em Engenharia Mecânica e de MateriaisUTFPR, 2019-11-22)
The viscoplastic fluid flow of Carbopol solutions is investigated in the following experimental study, for laminar and turbulent regime through an abrupt contraction with an aspect ratio of β = 1:85. The pressure drop ...