The aim of the present study is the simulation of the particulate flow in spiral separators. The study is based on Eulerian approach and turbulence modeling. The results focus on particulate-flow characteristics such as the velocity, the distribution, and concentration of particulates on the spiral trough. The predicted results are compared with the experimental findings from LD9 coal spiral. The comparison shows good agreement and indicates that the most accurate turbulence model is RNG K–ε.

Al–10% Al2O3-10% ZrO2 nanocomposite powders were fabricated by high-energy milling of the blended component powders. Planetary Monomill "Pulverisette 6" was used in milling the powders for 45 hours at 300 rpm and a ball-opowder ratio of 10:1. A uniform distribution of the Al2O3 and ZrO2 reinforcements in the Al matrix was ccessfully obtained after powders milling process. This uniform distribution was confirmed by characterizing these nanocomposite powders by scanning electron microscopy (SEM). X-ray diffraction (XRD) patterns were recorded for the milled powders, and analyzed using Williamson–Hall method to determine the crystallite size and the lattice strain. The crystallite size measurements were obtained using TEM observations in order to compare these results with those obtained from XRD

Al–10% Al2O3-10% ZrO2 nanocomposite powders were fabricated by high-energy milling of the blended component powders. Planetary Monomill "Pulverisette 6" was used in milling the powders for 45 hours at 300 rpm and a ball-opowder ratio of 10:1. A uniform distribution of the Al2O3 and ZrO2 reinforcements in the Al matrix was ccessfully obtained after powders milling process. This uniform distribution was confirmed by characterizing these nanocomposite powders by scanning electron microscopy (SEM). X-ray diffraction (XRD) patterns were recorded for the milled powders, and analyzed using Williamson–Hall method to determine the crystallite size and the lattice strain. The crystallite size measurements were obtained using TEM observations in order to compare these results with those obtained from XRD

In this Study four Sandstone rocks were drilled by diamond core bit using a fixed laboratory-drilling machine at 400 and 1200 rpm, rotary speed, over a range of weights on bit (WOB) 12,18,24,30,………kg. Operating parameters of the drill bit such as WOB, penetration rate (PR), torque (T), and specific energy (SE)were continuously monitored during the drilling trials. Besides the effects of formation properties on the penetration rate were monitored. Relationships between WOB and both PR, torque T and Se were described and the relationship between PR and SE was given. Graphs are presented and can be used to predict diamond-drilling performance easy and fast.

In this Study four Sandstone rocks were drilled by diamond core bit using a fixed laboratory-drilling machine at 400 and 1200 rpm, rotary speed, over a range of weights on bit (WOB) 12,18,24,30,………kg. Operating parameters of the drill bit such as WOB, penetration rate (PR), torque (T), and specific energy (SE)were continuously monitored during the drilling trials. Besides the effects of formation properties on the penetration rate were monitored. Relationships between WOB and both PR, torque T and Se were described and the relationship between PR and SE was given. Graphs are presented and can be used to predict diamond-drilling performance easy and fast.

It is very important to determine the optimum utility of any limestone deposit according to the physical and mechanical properties. The quality index is a good way for this aim. The physical properties such as porosity, density and water absorption and mechanical properties such as compressive-, tensile-strength and coefficient of dynamic fragmentation, control the optimal use of limestone as building, road construction and cement manufacture. These parameters are determined for several locations in Egypt and the quality index for each location is calculated, and the optimal use is determined.

It is very important to determine the optimum utility of any limestone deposit according to the physical and mechanical properties. The quality index is a good way for this aim. The physical properties such as porosity, density and water absorption and mechanical properties such as compressive-, tensile-strength and coefficient of dynamic fragmentation, control the optimal use of limestone as building, road construction and cement manufacture. These parameters are determined for several locations in Egypt and the quality index for each location is calculated, and the optimal use is determined.