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Effects of different mesh schemes and turbulence models in cfd modelling of stirred tanks

Karimi M., Akdogan G., Bradshaw S. M.

Physicochemical Problems of Mineral Processing

2012

Vol. 48, iss. 2

513-531

This paper focuses on the effects of grid schemes and turbulence models on the CFD modelling of stirred tanks. The economical grid was determined by examining the dimensionless wall distance and the skewness of elements. The grid independency study ensured that the independency of numerical predictions. Also, three categories of turbulence models were compared for prediction of flow pattern. The grid sensitivity study highlighted that the quality of control volumes in the bulk and near the wall regions are significant for obtaining the consistent solutions. It was also found that for the prediction of velocity components and the turbulent quantity the RANS based models are more efficient.

Effect of efrric nitrate and pax on wet milling of quartz.

Akdogan G., Johns D.

Fizykochemiczne Problemy Mineralurgii

1998

Vol. 32

165-171

The effect of selected inorganic and surface active grinding additives on wet ball milling of quartz has been studied as a function of pH and additive concentration. The results revealed that the effects of ferric nitrate and potassium amyl xanthate on wet ball milling of quartz were dependent on pH of the slurry and the concentrations of these additives. It was found that potassium amyl xanthate had marked beneficial effects on the production of -68 micron material at pH values between 5 and 8 at dosages between 5*10(-6) M. In ferric nitrate solutions, at pH 6.5 a decrease in the production of fines was observed. However, there was a marginal improvement on grinding efficiency at pH 5.

Badano wpływ wybranych związków nieorganicznych i powierzchniowo czynnych na mielenie kwarcu na mokro w młynie kulowym w zależności od pH i stężenia dodawanych odczynników. Badania wykazały, że wpływ azotanu żelaza (III) o ksantogenianu amylowo-potasowego zależy od pH układu. Stwierdzono, że pomiędzy ph 5 i 8 kasnotenian ma znaczny, pozytywny wpływ na powstawanie zawiesiny o uziarnieniu poniżej 68 um przy stężeniu ksantogenianu pomiędzy 5*10(-5) i 5*10(-6) M. Zmniejszenie ilości drobnych ziarn zaobserwowano w roztworach azotanu żelaza przy pH=6.5, ale zaobserwowano nieznaczny wzrost efektywności mielenia przy pH=5.