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 10 of 10 for “"Slurry flow"”.
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Analysis of slurry flow in chemical-mechanical polishing
… this thesis develops an analytical model for slurry flow in CMP in two steps. First, a simple but useful method of estimating the effective gap between the wafer and the pad during polishing is developed. The method uses pressurized fluid flow and an analytical model to estimate the effective …
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Experimental hydrodynamic study of the slurry distribution in a vertical slurry heat exchanger
A slurry heat exchanger is simulated as part of the Solvent Refined Coal-I plant to preheat the coal and solvent slurry before hydrogen injection. The shell and tube heat exchanger is oriented vertically with upward slurry flow on the tube side to minimize the localized solid sedimentation in …
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Alum treatment of caustic wash from chlorine bleached kraft pulp
… be used to dewater the sludge from the Dorr underflow. Approximately 5000 gallons of caustic wash from chlorine bleached kraft pulp was used for each phase of this investigation. The raw waste feed flow rate was varied from 1750 pounds per hour to 2499 Pounds per hour. The alum slurry flow rate …
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Control of wafer-scale non-uniformity in chemical-mechanical planarization by face-up polishing
… velocity, normal pressure, and especially slurry distribution at the wafer/pad interface. Wafer-scale polishing uniformity requirements are expected to be even more stringent in the future as the ULSI technology advances toward larger wafers (450 mm) and ever shrinking feature sizes (< 20 …
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An analytical and experimental investigation of the hydraulic transport of high concentration mixed regime slurries
… The inputs to the model are mean mixture flow rate, delivered. concentration and the particle and pipeline characteristics.. In order to calculate in situ concentration, the concentration distribution is found by using a diffusion model. A logarithmic velocity distribution is also required …
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Pharmaceutical crystallization design using micromixers, multiphase flow, and controlled dynamic operations
… is to exploit dual-impinging jets and multiphase flow to decouple nucleation and growth so that they can be individually controlled. Various configurations of micromixers were designed to provide controlled nucleation. Based on the dual-impinging-jet (DIJ) configuration, a physical explanation was …
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Developing a novel mechanistic model for four-phase oil-water-gas-sand stratified flow in a horizontal pipe.
… of blockage. Transporting sand along with other flowing phases is the best way of managing produced sand. Pipelines should be designed in such a way that flowing phases keep the sand particles moving and formation of the stationary sand bed should be mitigated by understanding flow physics under …
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Engineering efficient desalination systems: Materials development and systems analysis in capacitive deionization
… Replacing the stationary electrodes of CDI with flowable carbon slurries in a configuration termed flowable CDI (FCDI) has been proposed as a means of increasing concentration reduction. Therefore, specific objectives of this dissertation were to: (1) improve CDI energetic and salt removal …
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DETERMINATION OF THE SYNERGISM BETWEEN EROSION AND CORROSION IN POTASH-SAND SLURRY CORROSION OF CARBON STEEL
… The combination of erosion and corrosion in flow systems may lead to severe material wear in pipelines and equipment. When erosion and corrosion interact, a synergy may occur between them. Erosion-corrosion synergism may cause more or less material loss beyond the effects of pure erosion and …
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Flow Behavior of Granular Soil and Impounded Fly Ash Slurries
… embankment dam around mine tailings and coal ash slurry impoundments typically results in a fast-moving flow of toxic waste that can carry for several miles with disastrous consequence. The most recent catastrophic tailing-dam failure took place on 25 January 2019, at Brumadinho, Brazil, where the …