The axisymmetric flows with swirl or rotation were solved by a hybrid scheme with lattice Boltzmann method for the axial and radial velocities and finite-difference method for the azimuthal (or swirl) velocity and the temperature. An incompressible axisymmetric lattice Boltzmann D2Q9 model was proposed to solve the axial and radial velocities through inserting source terms into the two-dimensio...

Results of tests on NaI scintillation crystals operated at cryogenic temperatures are described. Crystals grown using both the Bridgeman-Stockbarger and Czochralski techniques were tested. Light output and scintillation pulse shape properties are assessed as functions of temperature using gamma and 252 Cf neutron sources and the results are interpreted with a view to optimising detector perform...

Analytical scanning and transmission electron microscopy were used to study the microstructure of Ce,Er-doped Na0.5La0.5MoO4 laser crystals. Crystals grown by Czochralski method from melts with a nominal composition Na0.5La0.5−xCexEr0.005MoO4, where x = 0.125 0.15, then annealed at 700 1000 °C in oxidizing atmosphere. We found secondary phase precipitation Ce2O3 oxide as-grown crystals, while a...

The effect of an insulation lid on the growth 4-inch β-Ga2O3 single crystals by Czochralski method is analyzed numerical simulation. mainly hinders upward radiant heat transfer from melt and crucible increases axial temperature gradient in crystal. Such benefits make melt/crystal interface convex, which conducive to suppressing spiral growing large with high quality. Materials low thermal condu...