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 24 for “"non-dimensional parameters"”.
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Bi-layered viscoelastic model for a step change in velocity and a constant acceleration stimulus for the human otolith organs
… differential equations of motion are derived and nondimensionalized yielding - three non-dimensional parameters: nondimensional viscosity, nondimensional elasticity and nondimensional density. These non-dimensional parameters are derived from experimental research. The shear stresses acting at the …
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Aero-thermal-mechanical interactions in ultra high-speed micro gas turbines
… confirming the hypothesis. The key controlling non-dimensional parameters characterizing the aerothermal-mechanical interaction and response are identified using a reduced order model that yields thermal-induced mechanical deformation in agreement with the unsteady computations. For …
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The temperature distribution on a rotating cylindrical shell in the presence of a primary radiative source and a reflecting and radiating infinite plane
… constant overall heat transfer coefficient. The non-linear problem is approximated through a perturbation analysis to obtain a linear problem. The solution to the linear equation is found by the Green's function technique. Then some numerical results are obtained for variations in the …
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Numerical simulation of primary petroleum migration
… of mass and volume conservation and are then non-dimensionalized. The result of this formulation of the problem is an equation similar in form to a diffusion equation that describes the volume and flow of oil in the system. The linear form of this equation is solved using a Crank-Nicholson …
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A numerical analysis of coupled solidification and natural convection within a two-dimensional rectangular cavity
… and natural convection within a two-dimensional rectangular cavity. The vertical walls of the cavity are adiabatic while the horizontal walls are isothermal, the upper boundary being maintained below the fusion temperature of the liquid. The solid layer that forms is assumed to have a …
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Internal Fluid Dynamics and Frequency Characteristics of Feedback-Free Fluidic Oscillators
… techniques including a method that allows non-intrusive measurement. The frequency characteristics were varied depending on properties such as the working fluid, scale and cavity geometry of the fluidic oscillator. Non-dimensional parameters were defined by taking the effects of these …
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Surface water flow resistance due to emergent wetland vegetation
… 40 and decreased with increasing plant density. Non-dimensional parameters determined through Buckingham Pi analysis were used in a regression analysis to develop a prediction model. Results of the regression analysis showed that the fraction of vegetated occupied area (P) was most significant …
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Attributes of Bi-Directional Turbomachinery for Pumped Thermal Energy Storage
… number of stages, definition of relevant non-dimensional parameters for blading selection, and optimization of two-dimensional blading for bi-directional operation. The assessment of stage count shows the relationship between relative Mach number, pressure ratio, and round-trip efficiency. …
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Impact Dynamics of Water Droplet on Solid Surfaces: Effect of Impact Reynolds Number, Hydrophobicity, Surface Roughness and Temperature
… along with surface temperature variation on non-dimensional parameters like spread factor, retraction rate, and spread velocity is analyzed. The increase in impact Reynolds number and droplet spread factor is observed with a rise in the initial height of the droplet. At a higher Reynolds …
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Design and manufacturing of modular self-compensating hydrostatic journal bearings
… by assuming them to be insignificant. Two non-dimensional parameters were derived to estimate the significance of the hydrodynamic effects and limits to these parameters were searched numerically. Design theory, along with first order equations to estimate bearing performance was developed.
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Near-wall reaction effects on film-cooled surface heat transfer
… this work is a set of tools based on a group of parameters that can be used to assess changes in heat load due to near-wall reactions. The non-dimensional parameters are the Damkohler
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Seismic response of structures with Coulomb damping
… of the base sliding and hysteretic systems. Non-dimensional design parameters defined in terms of the corresponding elastic design spectra are introduced for design purposes and for a consistent presentation of the results. Methods for predicting the important response quantities using the …
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High order numerical methods applied to the analysis of transport phenomena in combustion
… is achieved by suppression of the Runge phenomenon responsible for the vigorous oscillations of polynomial interpolations performed on equispaced nodes. By following the philosophy behind the Chebyshev polynomials, the idea of an optimum grid for piecewise polynomial interpolations of degree q _ …
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Grease particle deposition measurements in a kitchen exhaust duct for the development of low cost grease sensors.
… were performed using a 200:1 ratio of non volatiles: uranine using a Polydisperse Aerosol Generator (PAG). The use of a cylinder in cross flow with a strain gage arrangement and a LED-photo resistor arrangement on two opposite walls of a 0:254 m by 0:203 m (10 inches by 8 inches) duct …
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Modeling Material Degradation Due to Moisture and Temperature
… obtain semi-analytical solutions of several canonical problems to illustrate the nature of the quasi-static and unsteady behaviors of degrading hyperelastic solids. As second part, we propose several non- dimensional parameters that characterize chemo-thermo-mechanical coupling. These …
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Flow-Mediated Interaction Between a Vibrating and an Elastically-Mounted Cylinder
… are conducted for a range of combinations of parameters. The active cylinder’s oscillation frequency f1/ fn ranges from 0.05 to 3.2; the amplitude of the active cylinder A1/D varies from 0.025 to 1.432; the mass ratio of the passive cylinder m∗ takes the value of 1.5, 1.7, 2.0, 2.2 or 2.5; the …
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Structure and stabilization of cryogenic spray flames
… which has been investigated only recently. Two parameters controlling the shape of the flame are defined and the relationship between them is deduced from nuerical simulations. This approach permits a simple progression to more complex geometries. The flames above a porous plate with fuel …
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Dynamics of a vertically tethered marine platform
… operated at sea. The system is essentially one-dimensional because only the vertical motions of the underwater platform and the ship were coherent, while horizontal motions of the platform were weak and incoherent with any component of motion of the ship. The natural frequency of the system is …
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Box models of thermohaline circulation
… showing that the system is controlled by two key non-dimensional parameters relating the source volume flux to the volume flux of entrained fluid and to the diffusive flux, resulting in four distinct regimes. If this system is perturbed, it exhibits inertia in adjusting to the new equilibrium when …
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Large-Displacement Linear-Motion Compliant Mechanisms
… and off-axis stiffness. The metrics are non-dimensionalized and consist of the relevant characteristics that describe mechanism displacement, off-axis stiffness, actuation force, and size. Displacement is normalized by the footprint of the device. Transverse stiffness is normalized by a …
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