5 research outputs found
Fabrication of probes for scanning near-field optical microscopy using focused ion beam
The results were obtained using the infrastructure of the Center for Shared Use “Nanotechnology” of the Southern Federal University
Novel technology for fabrication of probe tips for SPM using focused ion beam induced deposition method
The work was done through a grant from the Russian Science Foundation (project No. 18-79-00175) using the equipment of the Research and Education Center and the Nanotechnology Joint Use Center of the Southern Federal University (Taganrog)
Development of technology for the formation of vacuum field emission cells using focused ion beams
Simulation of the particle motion in devices with vertical sectioning of workspace
Introduction. The relevance of the topic is
determined by the wide using of suspended bed apparatus
during the heat treatment of dispersed materials.
Materials and methods. Analytical studies were
carried out using the classical provisions of gas and fluid
mechanics and technical fluid mechanics. Physical
experiment was done on the development of industrial
design multistage shelf device.
Results and discussion. The mathematical model to
calculate the residence time of a particle in shelving unit is
developed, its adequacy confirmed by experimental
studies. The model can be applied for the drying, cooling,
granulation processes calculation. The residence time of a
single particle on a shelf in operating mode from 2 to 20
seconds, depending on the constructive execution shelf
and the gas flow rate. The mutual influence of particles
during their stay on the shelf increased by an average of 40
times. For the regime of particle motion in fluidized bed
(constricted movement) the maximum time can be up to
20 minutes. Changing the angle of the shelf and its length
has little influence as compared with a change in the
hydrodynamic regime of gas flow. Design of shelf
significantly affect the residence time of the particles in
the apparatus only in compressed motion regime. This
work theoretically and experimentally proved the
existence of different regimes shelf apparatus.
Conclusions. The influence mechanism of design
shelf and hydrodynamic regime of the gas flow on particle
residence time in multistage gravity shelf apparatus is
established. The research results are the basis of
engineering calculation of equipment with a vertical
sectioning of the workspace