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 201 for “"non-dimensional"”.
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A non-dimensional analysis of cardiovascular function and thermoregulation
The cardiovascular system plays a vital role in protecting the body from temperature extremes due to its unique ability to store, transport, and dissipate heat. A comprehensive study of the thermoregulatory aspects of the system is severely limited by its complexity and the interdependency of its …
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NON-DIMENSIONAL DATA-DRIVEN MODELS OF COMPUTATIONAL FLUID DYNAMICS (CFD) OF MULTI-PHASE FLOW IN ANNULUS
… thick annulus was established. In addition, two non-dimensional data-driven models were developed to describe the cavitation conditions in terms of downstream/upstream pressure ratio and non-dimensional geometric parameters. The first model evaluated the critical downstream/upstream pressure …
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Computational assessment of turbine rim seal system parametric variation on hot gas ingestion and flow pattern
… ratios. The results were used to formulate a non-dimensional sealing parameter, [psi], that has a threshold value of [psi] = 2.3 - 10¹⁵, beyond which there is only a marginal variation in ingestion penetration depth. This non-dimensional sealing parameter is given as a function of rim seal …
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Numerical Investigations of Air Flow and Heat Transfer in Axial Flux Permanent Magnet Electrical Machines
… the resistive torque. General correlations in non-dimensional form are obtained for the calculation of the heat transfer on the generator surfaces in the AFPM machines as a function of the above parameters. General correlations have also been obtained for the calculations of the non-dimensional …
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An experimental investigation of circular plates, beams and stiffened circular plates subjected to impulsive loading
… were compared to previous experimental work. A non-dimensional number for plates was modified to include an experimental mass scaling factor due to the ballistic pendulum mass. A non-dimensional number for rectangular beams was developed, including a similar experimental mass scaling factor. …
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Assessment of Scaling Rule for Hot Gas Ingestion in Representative Turbine Rim Seal System for Large Industrial Gas Turbines
… the hot gas ingestion depth in terms of a non-dimensional sealing parameter for a rim seal cavity wheelspace system representative of that in an industrial gas turbine for power generation. The non-dimensional sealing parameter consists of the ratio of purge mass flow rate to a …
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Graetz problem for slip flow in a channel in the presence of axial conduction, viscous dissipation and flow work
… inclusion of axial conduction increases both the non-dimensional temperature and the Nusselt number at a given location. The effect of slip flow is to increase the non-dimensional temperature and decrease the Nusselt number at a given location. The effects of viscous dissipation and flow work are …
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Unsteady Aerodynamics of Wing–Vortex Gust Encounters
… refine a method for generating vortex gusts. The non-dimensional pitch rate, change in angle of attack and Reynolds number are varied. The non-dimensional pitching distance is found to be the critical parameter governing the flowfield outcome. An excessively large non-dimensional pitching distance …
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Tropical cyclone size in observations and in radiative-convective equilibrium
… of radiative-convective equilibrium (RCE). The non-dimensional equilibrium radial wind profile is found to be modulated primarily by a single nondimensional parameter given by the ratio of the storm radial length scale to the parameterized eddy radial length scale. The relevant storm length …
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Local instantaneous convective heat transfer characteristics from mechanical and supply pulsed radial reattaching nozzles
… as a function of nozzle exit angle (0° and 20°), non-dimensional gap height (0.05 and 0.13), non-dimensional flow guide height (0.8 and 1.16), mechanical pulsation rate (5 and 10 Hz), supply pulsation rate (10, 20, 30, and 40 Hz), phase angle (0° and 180°), and Reynolds number (1683 and 2366). Air …
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Thermal Ignition Analysis in the Laminar Boundary Layer Behind a Propagating Shock Front
… a premixed gas; therefore, the ignition phenomenon is thermally induced. The boundary layer consists of a thin, diffusive, reaction region at the point where the temperature is maximum and diffusive-convective non-reacting regions adjacent to the reacting region. Both adiabatic and isothermal …
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The study of creep in machine elements using finite element methods
… becomes insensitive to the stress exponent. The non-dimensional creep laws are then implemented in a standard finite element scheme, from which the results of a stationary state creep analysis are then in non-dimensional form. In order to estimate rupture times, the maximum stationary stresses in …
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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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Carbon Monoxide Generation and Transport from Compartment Fires
… within the compartment as a function of a non-dimensional heat release rate. The non-dimensional heat release rate is based on the fuel load and geometrical parameters of the enclosure. The present methodology in applicable to situations where a well-mixed uniform layer is not present and …
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Constraint and Ductile Tearing Effects on the Cleavage Fracture of Ferritic Steel
… frequently invalidates these assumptions. The non-dimensional functions, g(M = bsigma 0/J), derived from application of the Weibull stress approach for a specific specimen and material, describes the evolution of constraint loss effects on the fracture toughness relative to a plane-strain, SSY …
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Experimental studies of flapping foils for energy extraction
… of flapping foils to extract energy in a two-dimensional flow. We focused on identifying the effects that foil motion parameters had on the hydrodynamic energy extraction efficiency and resolving the wake structure downstream of the foil. The primary foil motion parameters investigated were …
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Forces and moments due to unsteady motion of an underwater vehicle
… Institution, although the results are made non-dimensional to be applicable to a wide range of similar shaped vehicles. The experimental model was moved in sinusoidal motion at various submergences, speeds, frequencies of oscillation, and amplitudes of oscillation.
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Unsteady free convection on a horizontal circular cylinder in the presence of heat generation and radiation
… governing equations are first transformed into a non-dimensional form by using appropriate non-dimensional variables. These equations are then transformed into a system of nonlinear partial differential equations, then were solved numerically by using two types of finite difference methods namely …
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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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