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.
Results
Showing 1 to 20 of 35 for “"unsteady-state"”.
-
DYNAMICS AND CONTROL OF FORCED UNSTEADY-STATE CATALYTIC REACTORS
… deals with the dynamics and control of forced unsteady-state catalytic reactors and it is focused on two topics: 1. auto-thermal after-treatment of lean VOC mixtures. Two reactor configurations have been taken into consideration: the reverse-flow reactor (RFR), where the flow direction is …
-
Development of a microreactor system for unsteady-state Fischer- Tropsch synthesis
… systems have been developed for studies of unsteady-state Fischer-Tropsch synthesis. This development is aimed at preventing carbon deposition on a fused-iron catalyst in a novel reactor called the “heat-tray.” This reactor involves a supernatant gas flowing over a shallow fluidized bed of …
-
Evaluation of the Unsteady-State Quenching Method for Determining Boiling Curves
Made available in DSpace on 2014-12-13T18:55:39Z (GMT). No. of bitstreams: 1 7821223.pdf: 2947993 bytes, checksum: 9af1a840a8673031713dea7ef2246af8 (MD5) Previous issue date: 1978
-
A study of unsteady state natural convection for a vertical plate
Thesis (B.S.) Massachusetts Institute of Technology. Dept. of Chemical Engineering, 1957.
-
An Unsteady State Tracer Dilution Method for Characterizing Water Contributing Fractures in Crystalline Bedrock Wells
… to implement. This study demonstrates an unsteady state tracer method as a cost effective alternative for gathering fracture information in bedrock wells. The method entails: introducing tracer dye throughout the wellbore by trolling and mechanical mixing; packing off and draining the …
-
Development of an unsteady state model for the tank bioleaching of sulphide mineral concentrates in flow reactor systems
… distributions. The models evaluated at steady state are validated against pilot plant data obtained from the Fairview Mine in South Africa and were found to be in good agreement with the data. As the model was developed using a segregation approach and thus incorporates age distributions in the …
-
A New Method for Determining Average Reservoir Pressure from a Single Well Buildup Test
… a single well buildup test in a multiple well unsteady state oil reservoir, can give the true average reservoir pressure without prior knowledge of drainage area shapes. To sUbstantiate the accuracy of the model, test runs were made on regularly shaped reservoirs for which the solutions to the …
-
A study of well-balanced finite volume methods and refinement indicators for the shallow water equations
… finite volume methods to solve steady and unsteady state problems. A method is said to be well-balanced if it preserves an unperturbed steady state at the discrete level. We implement hydrostatic reconstructions for the well-balanced methods with respect to the steady state of a lake at …
-
A study of well-balanced finite volume methods and refinement indicators for the shallow water equations
… finite volume methods to solve steady and unsteady state problems. A method is said to be well-balanced if it preserves an unperturbed steady state at the discrete level. We implement hydrostatic reconstructions for the well-balanced methods with respect to the steady state of a lake at …
-
Thermal Analysis of Multi-Cylinder Drying Section with variant Geometry
… process in a multi-cylinder drying section. The unsteady state of one-dimensional heat conduction equation has been applied to mathematical model of both, cylinder shell and paper web. The internal mass transfer of the paper web has not been included in this work. The calculations of the …
-
Development of a computationally efficient model for the control of Ziegler-Natta catalysed industrial production of high density polyethylene
… model may allow for minimising losses during unsteady-state operation. Such a model must be developed from a fundamental understanding of polymerisation reaction kinetics and the interaction of effects at various scales, including those of catalyst sites, catalyst/polymer particles and reactor …
-
Flood Capacity Improvement of San Jose Creek Channel Using HEC-RAS
… software for hydraulic modeling for steady and unsteady state open channel flow, HEC-RAS is used to analyze multiple variations in channel geometry and combinations of lining materials. Of these modifications, the best configuration is suggested.</p>
-
Measurement of molecular diffusivities of liquid alkane systems
<p>"An unsteady-state porous frit method of diffusion coefficient measurement, recently developed in this laboratory, was improved and expanded upon. The experimental technique has been refined and documented. The unsteady-state diffusion of an initially 0.5 N NaCl solution into pure water …
-
The effect of the positions and molecular weight of hydrophilic functional groups of surfactants on gas absorption rates
… on the rate of gas absorption. A quiescent unsteady-state absorption apparatus was used with carbon dioxide and water as the absorption system. Three surfactants with hydroxyl groups were selected for study, namely, n-octanol, 4-octanol and lauryl diglycol amide. Preliminary absorption tests …
-
Mechanisms of Solubilization and Mass Transfer in Oleic Acid/aqueous Surfactant Systems
… system, was studied at 37(DEGREES)C. Steady state stirred experiments provided evidence of enhanced solubilization rates under conditions similar to those present for the physiologic process of fat digestion. Enhanced rates were attributed to the formation of an oleic acid/aqueous surfactant …
-
Oxygen Mass-Transfer in Tower Fermenters
… mass-transfer coefficients from the results of unsteady-state experiments. The effects of gas flow-rate, nutrient concentration, antifoams and microbial concentration on mass—transfer have been studied in detail: superficial air velocity and the presence of anti-foams are shown to be the most …
-
An experimental investigation of some capillary pressure-relative permeability correlations for sandstone reservoir rocks.
… early on that using these techniques in unsteady state experiments definitely leads to significant errors. The limitations of the existing facilities and the required technical modifications to eliminate errors are presented as part of the thesis. Therefore, an unsteady state relative …
-
Assessment of the Thermal Improvements Awarded by Horseshoe Vortex Elimination on a Turbine Stator Blade in Computational Fluid Dynamics and Conjugate Heat Transfer
… and turbulent. The analysis looks at the steady-state solution only. The meshing operation and the calculations are made using NASA-developed 3D codes: TCGRID and Swift. The author concludes that the drop in blade surface temperature reaches 109.6 K in a designated region of the tip. Many …
-
Research about low permeability measurement
… Our method evaluates the permeability under unsteady-state flow, which requires a shorter time to determine flow capacity of low permeability rock. The new approach is different from the existing methods, such as GRI, oscillating pulse, and pulse decay methods. The significance of this …
-
Modeling of Real Gas Flow Behavior in Porous Media
… by using the principle of superposition and an unsteady-state bounding technique. Validation of the model is favorably achieved by comparison with finite-difference simulation and type curve matching. Reservoir pressures and flowing bottomhole pressures calculated by the analytical solution …
Page 1 of 2