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Biomedical subjects

B Blanpain

Publications and source records attributed to B Blanpain.

5 recordsLinked to original sources
PubMed2006

Lattice-Boltzmann modeling of dissolution phenomena.

In this work, we present a lattice-Boltzmann model for the simulation of complex dissolution phenomena. We design boundary conditions to impose a fixed concentration or a surface flux for use in multicomponent lattice-Boltzmann models. These conditions can be applied to simulate complex reactive flow phenomena, e.g., in porous media. By combining the boundary conditions with a volume-of-fluid description of solid structures, the application area of the presented model is extended toward complex dissolution phenomena. The boundary conditions and the dissolution model are validated using benchmark problems with analytical solutions. The agreement is good in all tested cases.

Journal Article↗
PubMed2005

Lattice Boltzmann model for diffusion-controlled dissolution of solid structures in multicomponent liquids.

A lattice Boltzmann model for the dissolution of solid structures of arbitrary shape in multi-component liquids is developed. To model diffusion-controlled dissolution, a multicomponent boundary condition is presented to impose a fixed concentration on an arbitrarily located boundary. The dissolution rate of the solid is calculated based on the diffusion flow in the boundary layer. The model is validated using analytical solutions of simple dissolution problems in a static fluid, and is applied to the dissolution of a cylinder in a laminar flow.

Journal Article↗
PubMed2002

Surface oxidation of NiTi shape memory alloy.

Mechanically polished NiTi alloy (50 at% Ni) was subjected to heat treatment in air in the temperature range 300-800 degrees C and characterised by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy. Thermogravimetry measurements were carried out to investigate the kinetics of oxidation. The results of thermodynamic calculations were compared to the experimental observations. It was found that NiTi alloy exhibits different oxidation behaviour at temperatures below and above 500 degrees C. A Ni-free zone was found in the oxide layer for oxidation temperatures of 500 degrees C and 600 degrees C. The oxidation at 500 degrees C produces a smooth protective nickel-free oxide layer with a relatively small amount of Ni species at the air/oxide interface, which is in favour of good biocompatibility of NiTi implants. The oxidation mechanism for the NiTi shape memory alloy is discussed.

Alloys↗