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 826 for “"flow rates"”.
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Design and testing of a microvalve capable of precisely controlling low fluidic flow rates
… the design, manufacture, and testing for a gas flow regulating microvalve is presented herein. The microvalve project served as a test bed for new micromachining techniques and for exploration of MEMS devices made from non-silicon materials. We developed and tested a novel microvalve utilizing a …
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Enhanced flow boiling heat transfer in microchannels with structured surfaces at varied mass flow rates
This thesis investigates the role of mass flux on flow boiling heat transfer in microchannels with surface micropillar arrays. The motivation for this investigation was to determine the general trends of the optimal micropillar array geometry in terms of its heat transfer capabilities. The …
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An experimental investigation of air flow and convective heat transfer in enclosures having large ventilative flow rates
… transfer in enclosures under high ventilative flow rates is primarily of interest for building design and simulation purposes. Current models are based on experiments performed forty years ago with flat plates under natural convection conditions.
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3-D flow and performance of a rocket pump inducer at design and off-design flow rates
… a 3-D Navier-Stokes solver, The Moore Elliptic Flow Program. Design and off-design flow rates were simulated to qualitatively and quantitatively study the effects of flow rate on the flow and performance. Several views of the results were created to aid flow visualization. The 3-D laser …
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ANALYSIS OF DROUGHT ASSOCIATED IMPACTS ON THE CITY OF SAN BERNARDINO MUNICIPAL WATER DEPARTMENT’S WASTEWATER FLOW RATES AND CONSTITUENT CONCENTRATIONS
… wastewater treatment plant (WWTP) wastewater flow rates and constituent concentrations. The study utilized data obtained from the SBMWD’s monthly discharge monitoring reports (DMRs), dating from 2007 to 2015. For each report the SBMWD Water Reclamation Plant (WRP) and Rapid Infiltration and …
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CFD simulation of the airflow through the human respiratory tract
… effect of extra-thoracic airways (ETA) on the flow field through the lower airways by carrying out simulations of the airflow through the human respiratory tract. Three geometries, consisting of the ETA, CT-derived lower airway, and a combination of the two were utilized in simulations that …
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Assessment of the Measurement Repeatability and Sensitivity of a Noninvasive Blood Perfusion Measuring Probe
… perfusion is the local, non-directional blood flow through tissue. It is measured as the volumetric flow rate of blood through a given volume of tissue. One method that has been developed for measuring blood perfusion is a probe that measures the temperature response of the tissue when a …
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Dike-Driven Hydrothermal Processes on Mars and Sill Emplacement on Europa
… system and calculated heat and water flow using boundary layer theory. Water flow rates and volumes were then compared to the requirements for surface feature formation. Results found that the water volumes produced were adequate to form Athabasca Valles, except the flow rates were …
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Design and prototyping of a test facility to investigate the transport properties of dilute phase gas-particle flows applicable to coal-fired power plants
… and recording of the gas and particle mass flow rates. Practical tests were then conducted with Fly Ash, as a substitute for Pulverized Coal, to demonstrate the particle feed and extraction processes and to evaluate the accuracy of control of the gas and particle mass flow rates. Tests were …
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Nutrient Distribution Effects from Freshwater Discharge at Franklin Lock and Dam (S-79) in 2005 and 2006 on the Caloosahatchee Estuary and San Carlos Bay, Fort Myers, Florida
… of nutrients along the CE waterway and illustrates the effects high freshwater discharge from S-79 has on the coastal and offshore environments, providing a potential source of nutrient input. This study consisted of a 7-station transect monitored biweekly from April 2005 thru August 2006 for …
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Assessing evapotranspiration rates of a Mid-Atlantic red maple riparian wetland using sap flow sensors.
… evapotranspiration (ET) of exposed trees, ET rates of a first-order red maple riparian wetland were assessed with thermal dissipation probes during the 2002 growing season to address: a) if edge trees transpire more water daily than interior trees, b) correlations among sap flow rates and …
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Providing Safe Gastric Feedings In Pediatric Patients On High Flow Nasal Cannula Respiratory Support
… Unit (PICU). The primary outcome evaluated HFNC flow rates when starting gastric feeds. Secondary outcomes include adverse events (AEs), physiologic distress, and PICU/hospital LOS. Data were analyzed using Chi-Square test with Fisher’s Exact Test for categorical variables and Kruskal Wallis for …
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Some flow properties of liquid helium II
The properties of pressure-induced flow of liquid helium II have been studied by the observation of the temperature and pressure dependence of the flow in narrow channels. The channels are in the form of an annular slit between two flat glass plates. Measurements of the flow rates have been made …
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An investigation of bioluminescent microbial transport in porus media
… experimental setup were reproducible at similar flow rates and bacterial cell concentrations. The two main factors controlling microbial transport and activity were found to be flow velocity and oxygen concentration levels. The degradation and consumption of oxygen and contaminants is related to …
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Modeling of opening characteristics of an atrium in natural ventilation
… computational fluid dynamics(CFD) and airflow network tools, which have advantages and limitations. Investigations on atrium structure and opening characteristics have been limited up to now. This thesis studies the temperature stratification and air flow rates inside atrium buildings in …
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Control of flow and oxygen in a 3-D perfused micro-environment fosters balanced survival of hepatocyte-non-parenchymal cell co-cultures
… cells, and predicted that stimuli resulting from flow and oxygen gradients close to physiological conditions would preserve the delicate balance between the cell types. Spheroids containing hepatoctyes with incorporated non-parenchymal cells (NPCs) were seeded into capillary bed sized channels in …
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Creation of nonlinear density gradients for use in internal wave research
… was written to solve the model for the required flow rates in the system given a desired density gradient. The method was tested by creating three different density gradients: a linear gradient, a hyperbolic gradient, and a two-layer gradient. It was discovered that for a two-layer gradient the …
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Assessing the Effect of Traffic Incident Management Areas on Highway Capacity
… emergency response and restore traffic flow following roadway incidents. However, lane closures within TIMAs significantly impact roadway capacity, requiring an analysis of capacity reduction across different closure scenarios. This study examines the effects of one-lane, two-lane, and …
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Experimental Investigations of Internal Air-water Flows
… techniques to the study of gas-liquid pipe flows, with a focus on conditions occurring in header-feeder systems of nuclear reactors under different accident scenarios. Novel experimental techniques have been proposed for the identification of the flow regime and measurement of the flow rates …
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