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 16 of 16 for “"Flow maps"”.
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Probabilistic Flow Regime Map Modeling of Two -Phase Flow
… tubes using a common probabilistic two-phase flow regime basis. Probabilistic two-phase flow maps are experimentally developed for R134a at 25°C, 35°C, and 50°C, R410A at 25°C, mass fluxes from 100 to 600 kg/m2-s, qualities from 0 to 1 in 8.00 mm, 5.43 mm, 3.90 mm, and 1.74 mm …
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Towards imaging cerebral microvascular blood flow using MRI
… capillaries and venules, in which the blood flow velocity is slow (≤ 2 cm/s). The hemodynamic signals, blood oxygenation-level dependent response, cerebral blood flow, cerebral blood volume and cerebral metabolic rate of oxygen are the common surrogate markers to detect brain neural …
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Using a voxel-based krogh cylinder array to simulate microvascular contrast enhancement
… numerically simulating the local contrast agent flow between and inside image elements. To do this, tissue parameter maps were created, contrast agent was introduced to the tissue via a flow lattice, and various data sets were simulated. The effects of sources, tissue heterogeneity, and the …
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Flow patterns in upward two-phase flow in small diameter tubes
Two-phase flow in small tubes and channels is becoming a common phenomenon in industrial processes. However, the study of two-phase flow regimes in small tubes is still at its infancy. The previous studies are reviewed and discussed in the literature section. The problems and inconsistencies …
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Two-Phase Pressure Drop and Flow Regime of Refrigerants and Refrigerant -Oil Mixtures in Small Channels
… in their design, more exact understanding of the flow inside them is necessary. A decrease in diameter enhances the heat transfer (which takes place at the inner walls of the tubes), but also increases the pressure drop (as the diameter decreases, it becomes like drinking a milkshake through a …
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Groundwater and Tidal Controls on Wetland Hydrology, Julie J. Metz Wetland Mitigation Bank, Woodbridge, Virginia
… used to generate hydrographs, create groundwater flow maps, calculate hydraulic conductivity (K<sub>sat</sub>) by performing slug tests, and calibrate wetland water budget models using Wetbud software. Wetbud-generated water budgets using both Basic and Advanced scenarios calculated estimated …
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Modeling and Analysis of Optical Blur for Everyday Photography
… to fuse local DFD results into dense depth and flow maps. The noise, sparsity and ambiguities inherent in DFD makes this problem particularly difficult. We introduce a splined-based prior to enable fusion over great image distances and irregular shaped regions, and to allow explicit reasoning …
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Multiphase flows in polymer microfluidic systems
… reagents using pressure-driven multiphase flow in microchannels is a promising technology for high throughput microfluidic bioassays. Separation and encapsulation of the target reagents with another inert fluid provide many advantages over single phase flow in microfluidic applications of …
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A thermofluid network-based methodology for integrated simulation of heat transfer and combustion in a pulverized coal-fired furnace
… heat generation, together with characteristic flow maps for the mass transfer. Direct exchange areas are calculated using a discrete numerical integration approximation together with a suitable smoothing technique. Models of Leckner and Yin are applied to determine the gas and particle …
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Concept-Based Teaching and Meaningful Learning in Associate Degree Nursing Students
… of the discussions were analyzed using flow mapping. </p><p>Flow mapping is a qualitative data analysis method in which the researcher creates a graphic representation of students’ knowledge connections. The completed flow maps fell into two distinct groups distinguished by number and …
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Tip clearance flows in axial compressors: stall inception and stability enhancement
The flow in the rotor tip clearance gap in an axial compressor influences the loss levels and the stall onset point. The role of tip clearance flows in the stall inception process is still debated, though. The aim of this thesis is to improve the fundamental understanding of the tip clearance flow …
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High resolution studies of complex solar active regions
… imaging spectrometer combined with horizontal flow maps derived with Local Correlation Tracking (LCT) provide precise measurements of the three-dimensional velocity field in sunspots. Magnetic field measurements from ground- and space-based instruments complement these data. At the outset of …
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High order stochastic transport and Lagrangian data assimilation
… tracer advection in a deterministic swirl flow, stochastic flow past a cylinder, and stochastic lid-driven cavity flow. We show that our schemes improve the consistency between reconstructed DO realizations and the corresponding MC realizations, and that we achieve the expected order of …
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Condensation in horizontal smooth round tube
… even though the bulk enthalpy indicates the flow still in superheated region. Once the liquid appears, the heat transfer and pressure drop mechanism deviates from single phase analysis and switches into two-phase behaviors. According to this characterization, a fourth and fifth zone were …
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Developing NMR/MRI Techniques for Characterisation of Reactive Transport in Porous Media
Reactive flow in porous media is a complex transport phenomenon which involves the simultaneous flow and reaction of a fluid in a porous medium and plays a critical role in improving our understanding of carbon sequestration. When CO<sub>2</sub> is introduced into a storage site, which might be a …
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Mean-Field Free-Energy Lattice Boltzmann Method for Liquid-Vapor Interfacial Flows
… numerical development to simulate liquid-vapor flows and the applications to microchannels. First, we obtain a consistent non-local pressure equation for simulating liquid-vapor interfacial flows using mean-field free-energy theory. This new pressure equation is shown to be the general form of …