Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"impeller speeds"”.
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An investigation into the suspension, attrition and breakage of nickel crystals during the nickel reduction process
… of this study was to characterize the different impeller speeds required for suspension, attrition and breakage of nickel crystals in an autoclave.
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A DEM numerical modelling approach to simulating size segregation of media in a stirred mill and effects on grind characteristics
… systems were evaluated at different impeller speeds and weight distributions. The dry systems were susceptible to the Brazilian nut effect. Furthermore, it was found that excessive impeller speeds did not subsequently increase the overall collision modulus. The overall modal collision …
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Scale-up in emulsion polymerisation
… built 3 litre, unbaffled, reactor confirmed that impeller speed had a direct effect on the latex particle size and on the reaction rate. This was noted to be more significant at low soap concentrations and the phenomenon was related to the depletion of micelle forming soap by soap adsorption onto …
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An experimental investigation of a low Reynolds number, high Mach number centrifugal compressor
… the Reynolds number, which is about 20,000. The impeller tip speed of the test facility matched those in the design full-scale device to capture the effects of compressibility. Two compressor geometries were tested, one with and one without diffuser vanes; the same impeller was used in both …
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Evaluating the effect of operating variables on energy consumption in stirred mills Mussa Lisso.
… effects of residence time, solids concentration, impeller speed, impeller type, media size and media density on energy consumption in a batch vertical stirred mill were investigated. The effect of energy on mill performance was assessed using the perfect mixing mill model. In addition, the effect …
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Experimental investigation of mixing time in a stirred, torispherical-bottomed tank equipped with a retreat-blade impeller
… are typically equipped with a retreat-blade impeller placed close to the bottom of the tank a single baffle mounted from the top. The mixing performance of such reactors has not received significant attention in the literature, despite their ubiquitous presence in the pharmaceutical industry. …
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Application of MRI and low-field NMR in biopharmaceutical development
… using MRI. Comparison studies utilising impeller speeds higher than previously explored, as well as differing fluid rheology, were carried out, with three-dimensional rendering allowing for greater ease of comprehension and enhanced data visualisation.
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Hydrodynamics and gas dispersion in industrial flotation cells
… terms of key variables including air flowrate, impeller speed and location in the cell. The bubble size was found to increase with increasing air flowrate and decreasing impeller speed. Bubbles in the impeller zone were found to be smaller than bubbles in the quiescent zone due to significant …
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Modeling and Simulation of Large Scale Stirred Tank
… flow circulation. The agitator shaft has two impellers; a radial blade and a hydrofoil blade. The hydrofoil is used to circulate the mixture between the top region and bottom region of the tank. The radial blade sweeps the bottom of the tank and pushes the fluid in the outward radial …
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Mechanical dispersion of semi-solid binders in high-shear granulation
… Experiments were conducted over a range of impeller speeds, mixing times, and surfactant injection temperatures. Two surfactants where used each with different yield stresses. The yield stresses of both surfactants were characterized using uniaxial compression tests and extrapolated to the …
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Development of a novel bioreactor and systems for suspension cell culture in biopharmaceutical production
… exert high shear forces to cells due to the impeller speed, bubble disruption, and foam formation. In addition, at a large scale, improper mass transfer impairs the performance of cell lines and achieving high cell densities and prolonged viability with correct glycosylation of a secreted …