Topic
Jet mill
About: Jet mill is a research topic. Over the lifetime, 803 publications have been published within this topic receiving 5686 citations.
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TL;DR: In this paper, a combined discrete element method (DEM) and CFD numerical model was developed to simulate particle comminution in a jet mill, and the size distributions of the particles after grinding were obtained numerically.
Abstract: A combined discrete element method (DEM) and CFD numerical model was developed to simulate particle comminution in a jet mill. The DEM was used to simulate the motion of the particles in the gas flow. For this, the compressible Reynolds Averaged Navier-Stokes (RANS) equations were used to describe the gas flow field inside a given size's jet mill. Ghadiri's models for breakage and chipping were implemented in the simulation to define the reduction of the particle's size during jet milling. The size distributions of the particles after grinding were obtained numerically. The prediction of the numerical simulation for the median particle size d 50 after grinding was qualitative compared with experimental results for the different operating conditions (i.e., feed rate, angle of grinding nozzles, volumetric rate of grinding air, etc.). The comparison shows good agreement with the experimental observation. The results shows that the feed rate, angle of feeding nozzle, and feeding air's flow rate have more infl...
33 citations
TL;DR: Compressed air-powered jet mills used in the chemical and food industries for grinding and classifying powders were adapted as a powder generator for inhalation experiments and stability of aerosol concentration during six-hour continuous generation was 15 to 20%.
Abstract: Compressed air-powered jet mills are used in the chemical and food industries for grinding and classifying powders. We adapted one type of these fluid energy mills as a powder generator for inhalation experiments. The generating system included a jet mill and a screw feeder, the jet mill consisting of an elongated channel, a feeding jet to deliver the material into the channel, and two high-speed air jets. High speed air circulating in the channel created turbulence and centrifugal forces to disperse powder. The jet mill used can be operated from 25 to 100 psig at flow rates of 300 to 900 L/min. Two test materials–a solvent yellow dye and a dye mixture of solvent green and solvent yellow–were used. Both dyes were soft and sticky and could not be dispersed with several other powder generators tested at the concentrations required for toxicity studies. Aerosol concentrations ranging from 10 to 1500 mg/m3 at a flow rate of 400 L/min were obtained by adjusting the feed rate to the jet mill. Stability of aeros...
31 citations
TL;DR: In this paper, a fine grinding process of silica was carried out in a jet mill by varying the operational parameters such as feed rate, classifier rotational speed and grinding pressure.
31 citations
TL;DR: In this paper, the authors proposed a jet mill equipped with a particle-trap ring at the exit of the comminution zone to prevent the escape of large particles entrained by shortcut flow.
31 citations
TL;DR: In this paper, the results of 239 experimental runs on grinding calcite of particle size range 0.15-1.70 mm in an experimental jet mill of 20 mm diameter, using feed rates of 5-150 g/min and air pressure of 3-6 kg/cm 2 G are reported.
30 citations