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 20 of 35 for “"dimensionless groups"”.
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Dimensionless groups for interpreting proppant transport in hydraulic fractures
Includes bibliographical references (pages 137-142).
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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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Thermal non-Newtonian elastohydrodynamic lubrication of line contacts under sliding-rolling and simple sliding conditions
… simple sliding conditions. The most influential dimensionless groups are identified from the complete sets of dimensionless groups. Numerical results obtained for sliding and rolling and for simple sliding conditions are used to develop formulas for the thermal and non-Newtonian (Ree-Eyring) film …
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Scale-up investigation and hydrodynamics study of gas-solid fluidized bed reactor using advanced non-invasive measurement techniques
… order to achieve local and global similarity of dimensionless hydrodynamic parameters. The findings validate the achievement of hydrodynamics similarity in local solids and gas holdups distribution obtained by CT technique and in three dimension local solids velocities, solids shear stresses, …
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Evaluating of scale-up methodologies of gas-solid spouted beds for coating triso nuclear fuel particles using advanced measurement techniques
… reported in the literature based on matching dimensionless groups and the new mechanistic scale up methodology that has been developed in our laboratory based on matching the radial profile of gas holdup since the gas dynamics dictate the hydrodynamics of the gas-solid spouted beds. These …
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Vortex flow around the bases of obstacles
… analysis has been carried out to determine what dimensionless combinations of the flow variables might influence the scour depth. Small scale experiments were carried out to determine how the scour depth varied with these dimensionless groups. The results of these experiments are compared with …
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Experimental study of flow boiling under subatmospheric pressures in a vertical square channel
… a parametric study of the effects of important dimensionless groups on nucleation characteristics, specifically Boiling number, Jakob number, and density ratio. Bubble departure diameters and departure frequencies are measured via high-speed photography and compared to existing models. CHF data …
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Adsorption-Mediated Fluid Transport at the Nanoscale
… diffusivity ~50% smaller than bulk CO2. Two dimensionless groups are proposed to gauge the importance of surface adsorption and diffusion in CO2 storage and transport in nanopores. The third study examined the extraction of decane initially sealed in a 4 nm-wide calcite pore through exchange …
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Heat transfer in mixing vessels at low Reynolds numbers. An experimental study of temperature profiles heat transfer rates and power requirements for mechanically agitated vessels operating at low Reynolds numbers.
… the experimental data empirically in the form of dimensionless groups. In order to estimate the relative importance and the effect of all the geometrical parameters on the mixing power and heat transfer, data from the published literature sources will be utilized and combined with the results from …
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Separação de misturas líquidas em escoamento pelicular por meio de radiação térmica
… The relation between the two process is made by dimensionless groups, which represent thermal resistances and the energy mass influx on the system. The condensate mass flux, the increase on themass fraction of the non-volatile solute and temperatures are calculated as function of the groups …
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Prediction of coalbed methane reservoir performance with type curves
… (b) development and verification of the dimensionless groups for water production type curves, (c) generation of the CBM water production type curve, and (d) validation of the CBM water production type curve.;A modified correlation for peak gas rate estimation was also proposed as an …
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Brownian dynamics simulation of soft matter with hydrodynamics: methods for constrained systems and shear processing of 2D materials
… folded --- which are well-delineated by several dimensionless groups representing the ratios between shear strength and interaction strength, and bending rigidity and interaction strength. We use these dimensionless groups to explain the observed behaviors, explain the folding behavior of 1D …
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Optimal distributed control and estimation for systems with spatiotemporal dynamics
… are used to define physically interpretable dimensionless groups, which are found to be related to the measurement signal-to-noise ratio and to decentralization measures. The branch point locus is introduced as a useful tool to systematically explore the sensitivity of the spatial …
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Mechanistic Simulation of Solvent-aided Gravity Drainage of Bitumen
… non-isothermal gravity drainage. Also, three groups were defined to obtain a better understanding of the effect of the bitumen properties and the relative permeability curves on the drainage process. Group 1 with low initial bitumen viscosity, Group 2 with high initial bitumen viscosity, and …
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A Study of Heat Transfer Through Periodically Contacting Surfaces
… a set of curves connecting the variables through dimensionless groups. The validity of these results was corroborated by solving the heat diffusion equation by two independent methods, each of which yielded the same result. Experimental work showed that the theoretical data could be used to obtain …
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A framework for designing interlayers for ceramic-to-metal joints
… of dominant parameters is a linear function of dimensionless groups of secondary important parameters. The physical implication of each dimensionless group also has been clearly defined. Based on analytical equations, improved interlayer design rules have been proposed and verified …
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On falling spheres : the dynamics of water entry and descent along a flexible beam
… of the cavity structure on the governing dimensionless groups. A theoretical description is developed to describe the evolution of the cavity shape and yields an analytical solution for the pinch-off time and depth. We also examine low-density spheres that decelerate substantially …
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Studies On Copper Extraction With Hydroxyoxime Extractants For The Design Of Hollow Fibre Membrane Based Extraction Processes
… model utilising the two-film theory, some of the dimensionless groups and the experimental results has been proposed in this work to calculate the local mass transfer coefficients in the dispersed phase and the continuous phase. The overall mass transfer coefficient and the calculated local …
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Development of a framework for scaling surfactant enhanced CO₂ flooding from laboratory scale to field implementation
… evaluation and validation of scaling (dimensionless) groups for surfactant transport in porous media that affect sweep efficiency. The groups were obtained through dimensional and inspectional analysis and verified through practical laboratory coreflood experiments and numerical …
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Air entrainment in vertical dropshafts
… undertaken in the investigations. A number of dimensionless groups were obtained to describe the relationships between the parameters involved in the process. This enables the rate of air entrainment to be predicted in any.system of dropshafts under certain flow and geometrical conditions. The …
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