One of the most important steps in environmental studies is to get an accurate distribution of the pollutants in terms of its quantity and qualities. Some environmental studies are acquiring a good classification of the particle size including the average mean of the particle. Many researchers use the median size (x50) or until the size passing 80% cumulative undersize (x80) as a measure for ev...

This paper presents the results of characterization alumina ball size distribution in mill a crushing and grinding plant. The was unloaded balls were sieved. Then, adjusted to three kinds models; two them are traditional models Rosin-Rammler Gates-Gaudin-Schumann. third model applied Swebrec function, which has been successfully used on fragmented rock distribution. best adjustment for obtained...

We consider the defect size distributions at different stages of damage evolution, from the initial stage of defect nucleation and accumulation, through the intermediate stage of defect propagation and into the final stage leading to the appearance of the major crack. Critical events considered in this context are related to (a) the formation of microcracks exceeding the structural threshold as...

The spray characteristics of an air-assisted electrostatic atomiser are experimentally investigated using a shadowgraphy particle/droplet image analysis (PDIA) technique. Tests conducted for varied rates liquid- and airflow, with without voltage applied to the nozzle electrode. found droplet sizes neatly match Rosin–Rammler distribution, expression mean diameter as function flow is given. Notab...

Rock blasting with explosives is the first stage of rock fragmentation and plays a key role in results mining chain. Fragmentation optimization achieved by considering energy efficiency explosive, optimal distribution explosive rocky mass, programmed controlled release during blasting. The quality usually performed using tools that estimate sizes fragments via analysis two- or three-dimensional...

A mathematical system for modeling the effects of symmetrized instrumental aberrations has been developed. The is composed truncated Gaussian, sheared and Rosin-Rammler-type functions. shape function can uniquely be determined by standard deviation kurtosis. practical method to evaluate convolution with Lorentzian results application analysis experimental powder diffraction data are briefly des...

Abstract The controlled splashing of metal droplets plays a decisive role in the kinetics basic oxygen furnace (BOF) process. In this work, mathematical model was developed for predicting size distribution spherical ejected at an impingement zone. Harmonic oscillators are used to describe ejection sites, and upper limit droplet population is calculated through force balance. validated against l...

This study analyses the impact of particle polydispersity using Eulerian-Eulerian (EE) and Lagrangian-Eulerian (LE) modelling approaches in context wellbore cleaning operations drilling industry. Spherical particles sizes 0.5 mm, 0.75 mm 1 are considered, whereas a Power Law rheological model is used for fluid phase description. The EE approach implemented herein applies Kinetic Theory Granular...