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Experimental studies on the effects of process parameters on granule properties in a conical high shear granulator
, Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 32, Issue 3 , 2013 , Pages 115-125 ; 10219986 (ISSN) ; Farhadi, F ; Sharif University of Technology
Jihad Danishgahi
2013
Abstract
Experimental work was carried out to investigate the influence of impeller speed, granulation time, binder mass and their interactions on granule size distribution, mean size and binder content distribution in a conical high shear granulator. It was observed that the response of high shear granulation to changes in process parameters varies significantly from one operating condition to another. For all quantities of binder, the granule mean size increased with time at lower impeller speeds, while the opposite trend was observed at higher impeller velocities. For long mixing times, increasing impeller speed decreased the granule average size constantly; whereas for other durations, an...
Design, Optimization and Numerical and Experimental Investigation of the Impeller of a Centrifugal Compressor under Geometric Constraints
, Ph.D. Dissertation Sharif University of Technology ; Hajilouy Benisi, Ali (Supervisor) ; Durali, Mohammad (Supervisor)
Abstract
Centrifugal compressors are vastly implemented in the industry due to their higher pressure ratio per stage. So, researches are still going on to improve the performance of these devices. On this way, the current project is defined to perform geometrical optimization in the impeller of a centrifugal compressor using numerical and experimental methods. In this research, the design process of centrifugal compressors is first discussed according to methods and guidelines provided in several references. Then the compressor of the GT4082 turbocharger is redesigned using these theories. It is shown that overall available rules are enough to design an acceptable centrifugal compressor. Experimental...
Phenomenological Study of Granulation by Investigating the Effects of Operating Parameters on Granule Properties
, Ph.D. Dissertation Sharif University of Technology ; Farhadi, Fathollah (Supervisor)
Abstract
The present thesis has provided more fundamental understanding of granulation rate processes (such as coalescence, attrition and breakage) by investigating the effects of operating parameters on product properties. The studied process was wet granulation carried out in two high shear mixer granulators. Granulation duration, binder mass and impeller speed were considered as operating parameters and granule size distribution (measured by sieving) and granule binder distribution (measured by thermogravimetery method) were regarded as product properties. Experiments were conducted in two analogous cylindrical and conical high shear granulators. The obtained experimental and theoretical results...
Evaluation of the effects of process parameters on granule mean size in a conical high shear granulator using response surface methodology
, Article Powder Technology ; Volume 237 , 2013 , Pages 186-190 ; 00325910 (ISSN) ; Farhadi, F ; Sharif University of Technology
2013
Abstract
Response surface methodology was used to investigate the effects of operating parameters such as impeller speed, binder mass and granulation time on the average size of granules produced in a lab scale conical high shear granulator. Two quadratic models were proposed to express granule mean size as a function of impeller speed and binder mass as well as impeller speed and granulation time. It was found out that in the studied domain, the influence of each parameter on granule size differs from one another. While increasing binder mass at constant quantity of powder increased the average size linearly, increasing impeller speed changed the mean size in accordance with quadratic trend. The...
The effect of temperature and impeller speed on mechanically Induced Gas Flotation (IGF) performance in separation of Oil from oilfield-produced water
, Article Petroleum Science and Technology ; Volume 28, Issue 14 , 2010 , Pages 1415-1426 ; 10916466 (ISSN) ; Borghei, S. M ; Nadim, F ; Roayaei, E ; Sharif University of Technology
2010
Abstract
The effect of temperature and impeller speed on the performance of induced gas flotation (IGF) systems for the removal of oil from produced water in different ranges (5-300 g/L) of total dissolved solids (TDS) was investigated in a pilot plant study. Furthermore, it was evaluated whether the IGF pilot plant effluent could reach the 15 mg/L outlet oil content as required by Article VI of the Kuwait Convention for Persian Gulf region, before being discharged to the sea. The results showed that oil removal efficiencies up to 90% could be reached at high temperature (80°C) in just one single flotation cell without adding any chemicals. Flotation unit, however, should be followed by at least one...
Experimental investigation of blade number and design effects for a ducted wind turbine
, Article Renewable Energy ; Volume 105 , 2017 , Pages 334-343 ; 09601481 (ISSN) ; Kamali Monfared, R ; Rad, M ; Sharif University of Technology
Abstract
Over the recent decades, many different ducted turbines have been designed to augment efficiency of wind turbines. The design and number of blades are the most important parameters to optimize efficiency of wind turbines. In this paper, effects of design, number and attack angles of blades on rotational speed are experimentally studied in a duct which increases wind velocity up to 2.46 times numerically and 2.32 times experimentally as great as far-field flow. In order to realize this, 3 different types of aerodynamic blades were designed and then, 2-bladed, 3-bladed and 4-bladed impellers were created by these blades; finally, 9 impellers were built on aggregate. The rotational speed of...