Sanja Miskovic
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Supervision Enquiry
Graduate Student Supervision
Master's Student Supervision (2010 - 2020)
No abstract available.
The jet mill operates on the principle of collisions between particles to grind ultrafine powder material without the introduction of heat or any other external force and is capable of particle size reduction from about 100 microns down to 250 nm. The optimization process depends on parameters such as feed rate, grinding air pressure, physical characteristics of the solids (density, hardness, abrasiveness, or tenacity), physical characteristics of the mill shell liner, as well as feed and product particle size distribution (PSD).This research studied the optimization of the jet mill grinding process of ultrafine metallurgical powders in a small-scale 4” jet mill. The research was aimed to understand the effects of feed rate, compartment pressure, and feed particle size distribution on overall mill efficiency and iron entrainment using a stainless-steel shell. In addition, the effect of a polymer-based shell coating on milling efficiency, shell abrasion rate, and iron contamination reduction was assessed. The main variables affecting grinding such as feed rate, grinding air pressure, and feed size were investigated. Optimal operating conditions for running the lab scale jet mill are at the pressure range of 70 to 80 psi, with a feed rate of 3 to 5 kg/hr. At high grinding air pressures, the jet mill produces a small particle size, but high pressure requires more gaseous fluid which makes the process less efficient by consuming more energy.It is concluded that density and hardness seem to have a significant effect on the product fineness. Hard materials such as TaC, WC, and WTiTaC resulted in a finer product size than soft materials like TiC. High grinding air pressure has a greater effect on harder materials than on softer materials in achieving the fine product size. It is understood that jet milling can be more effective than ball milling if the optimum parameters are followed, as recommended in the study; such as feed rate, pressure, feed size, and the liner used in producing the metallurgical powders TiC, TaC, WC, or a combination of any of these.
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Publications
- A new method for calibration of radioactive particle tracking systems using computational fluid dynamics and Monte Carlo simulation data (2021)
CFB 2021 - Proceedings of the 13th International Conference on Fluidized Bed Technology, 351-356 - A study of RANS turbulence models in fully turbulent jets: A perspective for CFD-DEM simulations (2021)
Fluids, 6 (8) - Review of peridynamic modelling of material failure and damage due to impact (2021)
International Journal of Impact Engineering, 147 - Analysis of coupled CFD-DEM simulations in dense particle-laden turbulent jet flow (2020)
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM, 2 - VortexFitting: A post-processing fluid mechanics tool for vortex identification (2020)
SoftwareX, 12 - CFD simulation of single-phase flow in flotation cells: Effect of impeller blade shape, clearance, and Reynolds number (2019)
International Journal of Mining Science and Technology, 29 (5), 657-669 - The effect of particle size on coal flotation kinetics: A review (2018)
Physicochemical Problems of Mineral Processing, 54 (4), 1172-1190 - A high-order moment-conserving method of classes (HMMC) based population balance model for mechanical flotation cells (2017)
Minerals Engineering, 108, 36-52 - Investigation of gas dispersion characteristics in stirred tank and flotation cell using a corrected CFD-PBM quadrature-based moment method approach (2016)
Minerals Engineering, 95, 161-184 - Numerical and experimental investigation of single phase flow characteristics in stirred tanks using Rushton turbine and flotation impeller (2015)
Minerals Engineering, 83, 156-167 - Numerical simulation of fluid flow in deterministic lateral displacement devices (2013)
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM, 2 - Numerical study of single phase liquid mixing in stirred tanks fitted with Rushton Turbine and standard flotation impeller (2013)
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), 7 A - Comparison of two bubble sizing methods for performance evaluation of mechanical flotation cells (2012)
Separation Technologies for Minerals, Coal, and Earth Resources, 563-574
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