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 20 for “"Exchange flow"”.
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Unbalanced Exchange Flow
… ventilation systems that provide the ventilation flow rates required to maintain comfortable and healthy internal conditions while using little energy. This thesis considers exchange flow, a natural ventilation flow pattern that may occur at a horizontal opening in the ceiling of a room containing …
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Sub-Maximal Exchange Flow over a Sill with Barotropic Forcing
… are essentially side-by-side, causing an exchange flow due to gravitational forces. Dense fluid is pulled below light fluid and the light fluid is pushed above the dense, creating an opposing flow in the two layers. This exchange is often “controlled” at the point in the strait where …
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Mechanics of exchange flow between open water and an aquatic canopy
… heating creates density differences that drive flow between vegetated and open regions. This thesis presents a series of experiments that explored the magnitude and structure of these exchange flows for different forcing and vegetation distributions. The first project considers emergent …
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Fluids Viscosity Effect on Non-Isothermal Buoyancy-Driven Exchange Flow in Inclined Pipes
Buoyancy-driven exchange flow is studied experimentally for different Atwood numbers, inclination angles and fluid pairs. The density difference drives the flow, that is achieved through added salinity for isothermal case and temperature difference for the non-isothermal case. Detailed benchmarking …
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Dynamics and kinematics of an estuarine network
… on the hydrographic variability and varying exchange flow within the Newark Bay estuarine network. Shipboard hydrographic measurements reveal the time-dependent formation of salinity fronts between reaches of the estuary. Each front is generated by a different mechanism; however, all are …
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Sensitivity of the Estuarine-shelf Exchange in Mississippi Coastal Waters to River Diversions and Linkage Pathway Bathymetry: A Modeling Study
<p>The exchange flow between the Mississippi (MS) Sound and Bight is an intricate circulation pattern that affects many important regional processes, including flushing time, sediment transport, and larval dispersion. This study examines the exchange flow in the MS Sound by estimating the volume …
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Dynamics and kinematics of an estuarine network
… on the hydrographic variability and varying exchange flow within the Newark Bay estuarine network. Shipboard hydrographic measurements reveal the time-dependent formation of salinity fronts between reaches of the estuary.
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Development of designer-relevant Lattice-Boltzmann Wind Field Model for urban canyons and their neighborhoods
… model to get integrated into the design workflow, but current platforms to work on are either costly and time-consuming conventional Computational Fluid Dynamics (CFD) tools or over-simplified data correlation factors, which makes the workflow undesirable for designers' use. In this thesis, a …
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Interface pinning of CO₂ gravity currents
… on the migration of CO₂ plume through exchange flow experiments of immiscible fluids. We show that capillarity leads to the development of striking features not present in miscible exchange flows, including a vertical pinned interface and sharp corners. We show that interface pinning is …
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Glacier-ocean interactions in shallow-silled fjords
… with down-fjord winds intensifying the exchange flow and heat transport towards the glacier, and both wind directions decreasing ambient stratification near the glacier front. ☐ The findings of this dissertation contribute to a better understanding of the complex interplay between sill …
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Dynamics of Greenland’s glacial fjords
… to dominate the fjord circulation, driving rapid exchange with the shelf and large heat content variability near the glacier. Contrary to the conventional paradigm, these flows mask any glacier-driven circulation in the non-summer months. During the summer, when shelf forcing is reduced and …
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On gravity-driven flow
… interest under the umbrella of gravity- driven flow. In the first problem we analyse the effect of curved boundaries on the evolution of finite-release low-Reynolds-number exchange flow. From the equations of motion in an annular geometry we derive the governing nonlinear PDE for the evolution …
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Dynamics of Greenland's glacial fjords
… to dominate the fjord circulation, driving rapid exchange with the shelf and large heat content variability near the glacier. Contrary to the conventional paradigm, these flows mask any glacier-driven circulation in the non-summer months. During the summer, when shelf forcing is reduced and …
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Coastal sources of estuarine inflow
… release timing and oceanographic processes (i.e. flow reversals in the Strait of Juan de Fuca) played a role in the probability of successful transport. The next project examined the sources of inflow to an estuary in an idealized three-dimensional primitive equation model with simple forcing. The …
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Commodity Prices, Exchange Rate Fluctuation and Sustainable Development Goals in Sub-Saharan Africa: An Empirical Investigation
… the impact of commodity price change and exchange rate fluctuations on the capacity of Sub-Saharan African (SSA) countries to attain the UN 2030 agenda on sustainable development by using the dynamic panel data of forty-five (45) countries in Sub-Saharan Africa over a twenty-year timeframe …
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A novel reactor with two independently-driven impellers for gas-liquid processing
… a Rushton turbine (6RT) and a Scaba 3SHP1 axial flow impeller, with test fluids such as water and CMC, under unaerated and aerated conditions. In order to fully characterise the system, important mixing aspects such as mass transfer (hold-up, k\(_L\)a) and bulk blending (mixing times, circulation …
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Flow and reactive transport modeling at the stream-groundwater interface
… these processes by increased water and solute exchange across this interface, denoted as hyporheic exchange. This thesis investigates the influence of hydrological and morphological factors on hyporheic water and solute exchange as well as redox-reactions in fluvial streambed structures on the …
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Flow and mixing in complex porous media
The flow and mixing of fluids in complex porous media is important in a large range of environmental settings, from groundwater flows to the geological storage of carbon dioxide (CO$_2$). This thesis investigates two distinct and fundamental features of such flows; the mixing of miscible fluids of …
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Mixing and secondary circulation in Juan de Fuca Strait
… Pollutants and fresh water from river runoff flow out to sea in the upper layer, while nutrient-carrying oceanic water returns beneath. While there have been many studies of the processes involved in this exchange flow, the dynamics and vertical structure of transverse flows are much less …
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Investigation of Groundwater- Surface-Water Interactions – Application to Leech Lake Aquifer,
… using the physically-based surface– subsurface flow model (HydroGeoSphere) for the estimation of the effects of climate change and groundwater withdrawal on the corresponding groundwater aquifer systems. This study is conducted for one of the aquifers (Leech lake aquifer) of the City of Yorkton …