1: Magnetic Particles: Preparation, Properties and Applications: M. Ozaki. 2: Maghemite (gamma-Fe2O3): A Versatile Magnetic Colloidal Material C.J. Serna, M.P. Morales. 3: Dynamics of Adsorption and Oxidation of Organic Molecules on Illuminated Titanium Dioxide Particles Immersed in Water M.A. Blesa, R.J. Candal, S.A. Bilmes. 4: Colloidal Aggregation in Two-Dimensions A. Moncho-Jorda, F. Martinez-Lopez, M.A. Cabrerizo-Vilchez, R. Hidalgo Alvarez, M. Quesada-PMerez. 5: Kinetics of Particle and Protein Adsorption Z. Adamczyk.

Surface and Colloid Science

The formation of gas bubbles and their subsequent rise due to buoyancy are very important fundamental phenomena that contribute significantly to the hydrodynamics in gas−liquid reactors. The rise o...

Bubble Formation and Bubble Rise Velocity in Gas−Liquid Systems: A Review

The motion of small particles, drops, and bubbles in a viscous fluid at
low Reynolds number is one of the oldest classes of problems in theoretical
fluid mechanics, dating at least to Stokes’s (1851) analysis of the translation
of a rigid sphere through an unbounded quiescent fluid at zero Reynolds
number.

Particle Motions in a Viscous Fluid

Computational flow modelling and design of bubble column reactors

Mass transfer in the membrane concentration polarization layer under turbulent cross flow

Drag and mass transfer in non-newtonian flows through multi-particle systems at low reynolds numbers

The drag force and the mass transfer rate of a Newtonian fluid sphere, having mobile or rigid interface, moving in a power law fluid, are obtained by an approximate solution of equations of motion in the creeping flow regime. It is shown that both the drag and mass transfer increase as the flow index of the external fluid decreases. The increase of drag due to the pseudoplastic anomaly is more significant at large viscosity ratio parameter. The results obtained are in good agreement with available experimental data and with those analyses based on variational principle when the non-Newtonian flow behavior is not very pronounced. Also, the predicted mass transfer rates are in good agreement with the trends presented in the literature. Unlike in the case of drag force, the effect of the pseudoplastic anomaly on mass transfer rate is more pronounced for low values of the viscosity ratio parameter. The analysis was extended to include the case when the surface of the sphere was immobilized by surface...

Newtonian fluid sphere with rigid or mobile interface in a shear-thinning liquid: drag and mass transfer

Power Correlations for Close-Clearance Helical Impellers In Non-Newtonian Liquids

Four aspects of liquid-phase mixing in semi-batch bubble columns operating with viscous and non-Newtonian liquids were studied: the influence of the central plume on mixing rate, the velocity profiles, the gas hold-up, and the back-mixing. Three regimes of the bubble-induced mixing were identified and associated with the mode of the central plume. One of the modes, due to a moderate gas rate, was found to lead to optimal mixing. Also the gas hold-up and the degree of back-mixing were associated with the central plume mode. A model of the velocity profile proposed earlier was now modified and extended to apply also to the turbulent regime.

J.J. Ulbrecht

Papers

Drag and mass transfer in non-newtonian flows through multi-particle systems at low reynolds numbers

Newtonian fluid sphere with rigid or mobile interface in a shear-thinning liquid: drag and mass transfer

Power Correlations for Close-Clearance Helical Impellers In Non-Newtonian Liquids

More on mixing of viscous liquids in bubble columns

Formation of drops and bubbles in flowing liquids