Considerations in Using the Discrete Phase Model (DPM)

Many metallurgical processes involve multiphase flows and liquid metal processing is not an exception. During the secondary refining, and casting of steel, there are many interactions between the liquid phase, and the dispersed phases (spherical gas bubbles, inclusions, liquid slag droplets etc.). To mathematically model these operations, the Discrete Phase Method (DPM) is now being used by significant number of researchers. However, in certain publications, the equations presented are ambiguous but have nonetheless been referenced by many researchers. The present technical note highlights a mistake in the interpretation of the discrete phase equation in a technical paper by Hulstrung et al. 1 and also points out the mis‐leading equation in the ANSYS‐FLUENT 12.0 theory guide 2 .     

Accurate predictions for the viscosities of several liquid transition metals, plus barium and strontium

Recently, the authors presented two models for accurate predictions of the viscosity for pure liquid metals. In this article, the authors checked the models against the viscosities of various liquid high-melting-point metals. These two models give very good agreement with experiment. Using these two models, the viscosities of liquid transition and Group IIA metals were predicted for dysprosium, erbium, molybdenum, neodymium, platinum, scandium, vanadium, yttrium, barium, and strontium. Finally, recommended data were collected for the experimental viscosities of pure liquid metals.     

Growth and characterization of rare-earth mixed single crystals of samarium barium molybdate

Molybdate crystals doped with rare-earth ions are finding immense use as laser materials. Rare-earth mixed single crystals of samarium barium molybdate grown in silica gel are important for use in optical equipment and electronic and acoustic studies. These octahedral bipyramidal crystals of samarium barium molybdates are characterized by IR, EDAX and thermal analyses.     

Additive fabrication of a 3D electrostatic energy harvesting microdevice designed to power a leadless pacemaker

Microsystem Technologies - This paper presents the development of a process enabling to fabricate complex three-dimensional nickel microdevices. The possibilities offered by this new process are...