Advanced Materials and Processes Research Institute
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A lumped discrete population balance model for shear flocculation model development.
No full textIn the shear flocculation process, flocculation of ultrafine (size < 10 μm) hydrophobic particle occurs in the presence of a high shear field. Hence, it is necessary to consider both processes of coalescence and breakage, while modelling shear flocculation.\ud
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In this paper, a lumped discrete population balance model is presented considering both processes of coalescence and breakage of flocs. A method is also proposed to convert discrete kernels to lumped discrete kernels by satisfying the constraints on them. The numerical solution of the model is compared with some special analytical solutions of the continuous population balance model, with which it is observed to be in agreement. The model equations are derived in such a way that it predicts correctly both the rate of change of number and the total volume of the flocs. The size distribution of a flocculating suspension can be predicted by this model
Hydrodynamic considerations of anaerobic packed bed bioreactor for waste water treatment.
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Indentification of recharge transistion and discharge zones through the interpretation of remote sensing data.
No full textAnnual Progress Report of Regional Research Laboratory, Bhopal for the period from 1996-1997
No full textAnnual Progress Report of Regional Research Laboratory, Bhopa
Microstructural Modifications Through Compositional Alterations and Their Influence on the Mechanical and Sliding Wear Properties of Zinc-Based Alloys
No full textDry sliding wear response of zinc-based alloy Influence of heat treatment, sliding speed and pressure.
No full textAn attempt was made to study the dry sliding wear behaviour of a Zn-27.5 Al-2.5Cu-0.03Mg alloy over a range of applied pressures and sliding speeds. The influence of T6 heat treatment (solutionising followed by artificial aging) on the wear characteristics of the alloy was also examined under identical test conditions. Wear rate increased with pressure and sliding speed while seizure resistance followed an opposite trend. At the three lower speeds (i.e. 0.42, 1.38, and 2.68 m s-l) two wear regimes, namely mild and severe, were exhibited by the as cast and heat treated specimens wherein low wear rates initially occurred up to a specific pressure. This was followed by the attainment of severe wear at higher pressures. However at the highest speed of 4.60 m s-l, the specimens showed only the severe wear regime. Heat treatment caused improved wear response of the alloy up to the sliding speed of 1.38 m s-1. Further, the heat treated alloy performed better than the as cast alloy before seizure at 2.68 m s-1, while it showed identical wear characteristics in both conditions at 4.60 m s -1. The wear behaviour of the alloy is explained on the basis of the nature of its micro constituents. The results are supplemented with analyses of the wear surfaces, subsurface regions, and the debris particles which have also been able to throw light on the operative wear mechanisms
