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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 20 of 22 for “"dimensionless numbers"”.
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Mathematical Scaling and Statistical Modeling of Geopressured Geothermal Reservoirs
… the most succinct and meaningful form of the dimensionless numbers for scaling the designs. The dimensionless numbers are tested and verified by selecting models with identical dimensionless numbers but different dimensional parameters. For creating the response models, statistics is used to …
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Optimisation et prédimensionnement des treillis, arcs, poutres et câbles sur base d'indicateurs morphologiques; application aux structures soumises en partie ou en totalité au flambement
… (trusses, cables, arches, beams) thanks to dimensionless numbers called morphological indicators. A good summary of this method can be read in the inroduction and conclusion of the following article: Latteur Pierre, Feron Jonas, Denoël Vincent, “A design methodology for lattice and …
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Reactor Design for Partial Upgrading of Bitumen via Aquaprocessing
… bed reactor. Diffusivity of steam in bitumen, dimensionless numbers and hydrodynamic properties of the fluid inside the reactor were calculated using experimental and simulated data. The experimental results indicate that the effect of catalyst particle size depends on the catalyst preparation …
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Scaling Analysis for the Direct Reactor Auxiliary Cooling System for AHTRs
… non-dimensionalized by introducing appropriate dimensionless parameters, including the dimensionless length, temperature, velocity, etc. The key dimensionless numbers, i.e., the Richardson, friction, Stanton, time ratio, Biot, and heat source numbers that characterize the DRACS system, are …
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Deriving and verifying a general granular locomotion scaling law
… system was described as a function of a set of dimensionless numbers which are ratios of the dimensional parameters of the system. From the dimensionless description of the system, a set of scaling families are derived, where each member of a family has the same dimensionless inputs but …
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A Numerical Approach for Oil Slug Mobilization in a Capillary Tube Under Absence and Presence of External Excitations
… past research in this field, this work employs dimensionless numbers and sensitivity analysis to more accurately analyze the effects of different parameters on the pressure drop. The model in this thesis also likely represents a novel simulation in which vibrations are used to aid in the …
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Continuous reservoir modeling updating by integrating experimental data using an ensemble Kalman Filter
… done on the capillary transition zone. Two new dimensionless numbers are introduced-capillary time and capillary length. We found that for different models, if their capillary time and gravity number are equal, the capillary length would be the same. The scaling analysis results help us find a …
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Numerical reservoir characterization using dimensionless scale numbers with application in upscaling
Dimensionless space provides a tool for analyzing the behavior of complex systems described by mathematical relationships. The limited application of dimensionless variables in numerical reservoir simulation and experimental design motivated the development of a complete set of dimensionless …
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Predictive Modeling of Organic Pollutant Leaching and Transport Behavior at the Lysimeter and Field Scales
… For general application of these functions dimensionless numbers known as Damköhler numbers were used to characterize the reaction of the pollutants with the solid matrix. Two functions were derived and have been incorporated into an Excel worksheet to act as a practical aid in the …
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Burial of Short Cylinders Induced by Local Scour and Bedform Migration Under Waves Plus Currents
… and speed) were determined and plotted against dimensionless numbers. Sandwaves are shown to control the vertical displacement of the specimen. It is seen that the vertical displacement of the cylinder no longer coincides with the burial depth. This is primarily due to the more or less exposure …
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Electrochemistry and Electrokinetics in Microchannels
… each device design. Based on these simulations, dimensionless groups were found that defined the dominant physics in each system. These dimensionless numbers were then validated experimentally and numerically over a range of device parameters. Subsequently, operation criteria were developed to …
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Artificial Micro-Devices: Armoured Microbubbles and a Magnetically Driven Cilium
… fluid at an intermediate value of the two dimensionless numbers quantifying the dynamics.
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Elastohydrodynamic lubrication of smooth and rough surfaces
… of the pressure spike as a function of two dimensionless numbers is followed. Comparisons with results from full numerical solutions are shown, giving good agreement. The scheme is later extended to consider compressibility and the Roelands viscosity law. After reducing full EHL geometry, …
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The development and application of a simultaneous two-way coupled, discrete element method and smoothed particle hydrodynamic model for spatial scale-up dynamics of laboratory vertical stirred media detritors
… the use of single value quantities, such as dimensionless numbers and intensive variables, as metrics for mill performance. These quantities showed sensitivity to different attributes of mill performance.
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Two-phase flow processes with dynamic effects in porous media - parameter estimation and simulation
… Pc-Sw relationship is carried out. In the dimensionless equations the well-known capillary and gravitational number, Ca and Gr, evolve. Moreover, the new dimensionless number Dy appears as a factor. Dy quantifies the ratio of the 'dynamic capillary force' to the viscous force. Relating Dy …
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Pore-scale Study of Flow and Transport in Energy Georeservoirs
… the interactions between the critical dimensionless numbers associated with multiphase flow, including contact angle, viscosity ratio, and capillary number (Ca), were investigated using X-ray micro computed tomography (micro-CT) scanning and LB modeling. The primary novel finding of …
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Corrosion and Corrosion Prevention Technology: Revisiting the Fundamentals and Looking Forward
… failure of anti-corrosion coatings, with three dimensionless numbers governing the rupture, delamination, and visibility of blisters, while the latter leads to a useful tool which can be used to quantify species mobility and coating hydrophilicity using relatively simple measurements. The models …
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Přenos tepla radiací
Táto bakalárska práca sa zaoberá prenosom tepla, konkrétne radiačným prenosom tepla s konvekciou. Práca je členená na teoretickú časť a výpočty. Teoretická časť popisuje základné termomechanické pojmy a jednotlivé druhy prenosu tepla s dôrazom na prenos tepla radiáciou s konvekciou. Kapitola Prenos …
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Multiphase flow modeling and deposition of hydrates in oil and gas pipelines
… the slip between gas and liquid phases, using dimensionless numbers, was developed for a general fluid system. The effect of inclination/gravity was studied and incorporated in the gas-liquid slip. Using this model to simulate hydrate formation in subsea pipelines, it was shown that higher …
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Flow, sediment transport and bedforms under combined flows
… characterized and reproduced in dimensional and dimensionless phase diagrams. A complete re-evaluation of the nomenclature for combined flow bedforms is proposed, which includes their planform and the cross-sectional geometries in order to better represent the bed morphologies. This new …
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