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 72 for “"Density Ratio"”.
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The Effect of Density Ratio on Steep Injection Angle Purge Jet Cooling for a Converging Nozzle Guide Vane Endwall at Transonic Conditions
… experimental investigation of the effects of density ratio on endwall thermal performance at varying blowing rates for a typical nozzle guide vane platform purge jet cooling scheme. An axisymmetric converging endwall with an upstream doublet staggered cylindrical hole purge jet cooling scheme …
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Differential Diffusion of Scalars in Sheared, Stratified Turbulence
… diffusion depends on the strength of shear, the density ratio, the molecular diffusivities of the scalars, and the activity of the scalars. Experiments revealed that heat mixes more efficiently across a sheared density interface compared to salt for strongly stratified, weakly turbulent flows. In …
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Modeling the Thermal and Electrical Properties of Different Density Sintered Binder Jetted Copper for Verification and Revision of The Wiedemann-Franz Law
… trend linking electrical resistivity to the density ratio of the copper. Within the thermal conductance measurement, a lot more variability was seen within the three different prints. The 70% density ratio prints saw a large 13% spread in density ratios throughout the prints, which is …
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Lattice Boltzmann simulations of multiphase flows
… flows relevant to Air Conditioning and Refrigeration Center (ACRC) applications. Other methodologies have been used to simulate multiphase flow including finite volume based Navier-Stokes solvers. These methods have found reasonable success in simulating multiphase flows. LBM was chosen because …
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Technoeconomic Assessment of a Gossamer, Planar, Gigawatt-Scale Space-Based Solar Power System
… requirements derivation, preliminary concept generation, system decomposition, metrics formulation, architectural decision-making, and tradespace analysis. As for the financial feasibility, the assessment has been based on two metrics: the net present value (NPV) and the levelized cost of …
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Meshless Local Petrov-Galerkin method with Rankine source solution for two-dimensional two-phase flow modelling
… is applicable to fluids with a wide range of density ratio from 1.01 to 1000, capable of dealing with violent flow situations (e.g. breaking waves) and maintaining the sharp discontinuity of properties of the fluids at the interface. In order to extend the MLPG_R method to model multiphase …
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Extracting fluid properties through high-speed video analysis
… by analyzing trends in the surface tension to density ratio for cooling water, and for water versus glycerol.
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Aspects of finite temperature field theories in Ads/CFT
… I consider the shear viscosity to entropy density ratio in conformal field theories dual to Einstein gravity with curvature square corrections. For generic curvature square corrections I show that the conjectured viscosity bound can be violated. I present the calculation in three different …
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Shear Effects on Buoyancy-Generated Turbulence and Salt Fingers
… conditions. Effects of shear on the flux ratio are small. The laboratory experiment also produces results similar to the linear theory. Even though the bulk mixing rate increases as the density ratio decreases, the heat flux is larger than the salt flux, and no strong signature of salt …
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Experimental study of flow boiling under subatmospheric pressures in a vertical square channel
… 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 are presented as a parametric study of pressure from 20 kPa to 108 kPa, mass flux from 45 kg/m2s to …
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The distribution of dark matter at large scales and in gravitational lenses
… research study presented here concerns the flux ratio anomaly in the quadruply imaged strong gravitational lens, B1422+231, in which the contribution of $10-10^3M_{\odot}$ primordial black holes (PBHs) as a potential dark matter constituent is examined. I review the theory of gravitational …
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Analysis and Conditioning of GNSS Measurements from Smartphones for Precise Point Positioning in Realistic Environments
… and low and irregular carrier-to-noise-density ratio. The measurements are analysed and conditioned or pre-processed by implementing a prediction technique for filling in data gaps and a C/N0-based stochastic model for assigning realistic a priori weights to the measurements in the PPP …
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Numerical simulations that characterize the effects of surfactant on droplets in shear flow
… utilizing the code SURFER++ with the incorporation of an insoluble surfactant in the VOF scheme were conducted to characterize the effects of surfactant on a drop in shear flow. The drop is suspended in a matrix liquid. A parameter called reduction, which specifically relates to a percentage …
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The effects of double-diffusion on a baroclinic vortex
… oceanic intrusion. Intrusions are driven across density-compensated fronts by the divergence of the double-diffusive buoyancy flux. The increased momentum transport across a double-diffusive interface, however, acts to oppose the action of the buoyancy flux. Turbulent double-diffusive Ekman …
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Detecting episodes of star formation using Bayesian model selection.
… galaxies are derived using multivariate kernel density estimates of the input parameter distributions before fitting results and Bayes factors for multiple scenarios of nested models. In addition, we investigate the role that prior specification has in the derivation of physical parameters. …
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The Runny Gauge Plasma: shear viscosity to entropy for quarks and gluons
… a remarkably small shear viscosity to entropy density ratio η/s ~< 0:5, near the confinement temperature. Our main argument hinges on combining both the thermal and vacuum fluctuations in resummation-improved perturbation theory. In this respect, we thoroughly analyse the range of applicability …
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Experimental Characterization of Mode I Fracture Toughness of Reinforced Carbon Fiber Laminate with Nano-Cellulose and CNT Additives
… benefit gained from increased stiffness to density ratio with composite materials, innovative developments resulting in improved through-thickness strength have been on the rise. The inherent anisotropy of composite materials results in an added difficulty in designing structural elements …
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NUMERICAL MODELING OF THE VERTICAL HEAT TRANSPORT THROUGH THE DIFFUSIVE LAYER OF THE ARCTIC OCEAN
… accurate approximation of heat fluxes when the density ratio is sufficiently large. DNS results also reveal that the models with rigid boundaries result in heat flux estimates that are lower than those from models with periodic boundary conditions. Finally, the DNS-derived flux law was applied …
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Frequency reuse through RF power management in ship-to-ship data networks
… energy per bit to one sided noise power spectral density ratio (Eb/N0) versus BER. Simulation results are used to compute the minimum range (R) at which the channel can be reused while maintaining an average BER of 10 to the 6th power. The results show that even when no power control is used the …
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A coupled DEM/CFD analysis of die filling process
… effects of air and particle properties (size, density, size distribution, cohesion etc.) on powder flow are explored. The results are in a good agreement with experimental observations. Powder flow is characterized in terms of a dimensionless mass flow rate and a critical filling velocity. When …
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