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 207 for “"Flow Pattern"”.
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Spray drier simulation and air flow pattern studies
… within 10oC of experimental data. Air flow patterns have been investigated in a 1.2m diameter transparent countercurrent spray tower by flow visualisation. Smoke was introduced into various zones within the tower to trace the direction, and gauge the intensity, of the air flow. By means …
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Designing performative surfaces : computational interpretation of flow pattern drawings
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2012.
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Investigation of cutting temperature and cutting force from mist flow pattern in MQL technique
… performance is affected by the lubricant type, flow rate, the distance between nozzle and tool tip, and the workpiece material. These important parameters are not reported in many research documents. MQL is known for its many benefits but no one was able to prove that the statement is true or …
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Flow pattern mapping of horizontal evaporating refrigerant flow based on capacitive void fraction measurements
… these devices, the prediction of two-phase flow heat transfer of evaporating refrigerants has to be improved. This heat transfer is strongly related to the two-phase flow patterns. Improving the current two-phase flow models should therfore focus on incorporating more flow phenomena into the …
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Effect of hydrological flow pattern on groundwater arsenic concentration in Bangladesh by Khandaker Ashfaque.
… the complex transient dynamics of groundwater flow, and the transport of arsenic and other solutes that control its mobility in the area. A detailed three-dimensional hydrological model of our study area in Munshiganj indicates that: (1) the shallow aquifer acts primarily as a conduit for flow …
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The use of flow control devices to improve the flow pattern and throughput of sieve trays
… efficiency is in part determined by the liquid flow pattern and the throughput by the liquid froth height which in turn depends on the liquid hold-up and vapour velocity. This thesis describes experimental work on sieve trays in an air-water simulator, 2.44 m in diameter. The liquid flow …
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Computational assessment of turbine rim seal system parametric variation on hot gas ingestion and flow pattern
… parametric variation on hot gas ingestion, flow pattern, and turbine stage efficiency. The parameters focused on are purge to main mass flow rate ratio, axial gap to rim radius ratio, radial gap to rim radius ratio, normalized axial position of the blade leading edge, and internal purge …
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Manufacturability of lab on chip devices : reagent-filled reservoirs bonding process and its effect on reagents flow pattern
… trials of the product, undesired reagent flow patterns (namely, flow anomaly 1 & flow anomaly 2) were noticed. This work focused on optimizing the bonding process of the reagent-filled reservoirs to the backbone. Also, the relationship between the bonding process parameters and the reagent …
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Carbon Dioxide and R410A Flow Boiling Heat Transfer, Pressure Drop, and Flow Pattern in Horizontal Tubes at Low Temperatures
… and refrigeration systems. In this study, CO2 flow boiling heat transfer coefficients and pressure drop are measured in macro-scale (6.1 and 3.5 mm) tubes at evaporation temperatures of -15 and -30°C. The measured results show that the nucleate boiling is a main heat transfer mechanism in …
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New Insights into Lead and Copper Corrosion: Impacts of Galvanic Corrosion, Flow Pattern, Potential Reversal, and Natural Organic Matter
… periods. In addition to water chemistry, flow pattern also has an impact on galvanic corrosion of lead. Conventional wisdom regarding lead release indicates that continuous flow results in the greatest mass of lead release, but reports of anomalously high lead concentrations after long …
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Dense-phase pneumatic transport of cohesionless solids
… lexan which allows for visual observation of the flow pattern. The particles used were a mixture of 95% white and 5% black polyethylene granules (particle diameter approximately 3 mm). The black particles were used to aid the visual observation of the flow pattern. The flow patterns ranged from …
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Bedload Transport, Self Acceleration, Downstream Sorting, and Flow Dynamics of Turbidity Currents
… carried mostly as bedload. Succession sustained flows are allowed to create a deposit behind a barrier that simulates the downstream end of a minibasin. The flows are introduced in the supercritical regime; the downstream barrier forces an internal hydraulic jump to the subcritical regime. This …
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Weichselian glaciations in the middle Notec River region, northwest Poland
… thesis presents results of studies on the ice flow pattern and ice movement mechanism during the Weichselian glaciations in the middle Notec River area, NW Poland. A new lithostratigraphy of the study area has been established, based on correlation of stratigraphical position, clast lithology, …
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Flow field investigation in pulse 1 motor of a two-pulse solid rocket motor
… technique was used in this investigation of the flow field in the pulse I motor of a two-pulse solid rocket motor. A full scale model of clear acrylic material was constructed to allow direct visual access of the flow field. The experiment, which was conducted with one of the VPI water analogy …
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Flow patterns on distillation trays
Studies into the two-phase flow patterns produced on a sieve tray were carried out using an air-water simulator of 2.44 m in diameter. The flow patterns were investigated by a number of methods, direct observation using directional flow pointers; by water-cooling to simulate mass transfer; and by …
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Evaporation of pure fluids and mixtures in a microchannel tube
Two-phase flow in microchannel tube is taking huge interest by both the academic and engineering worlds. It is necessary to understand the flow when the diameter is at the scale of one millimeter. The decreasing in diameter enhances the heat transfer, but also increases pressure drop. The two-phase …
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Radio-echo sounding of Pine Island Glacier, West Antarctica : understanding the past from observations, analysis and modelling of internal layering
… did identify signs indicating a past change of flow pattern in several localised areas in the northern part of the catchment basin. Results also indicated that different parts of Pine Island Glacier are likely to respond in different ways to external forcing. The analyses of the radar data were …
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Modeling of multiphase turbulent flow in continuous casting of steel
… mathematical models of multiphase turbulent flow and investigates multiphase flow issues arising in the continuous casting process of steel through the application of the developed models. In the continuous casting of steel, argon gas injection at Upper Tundish Nozzle (UTN) wall or stopper …
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Computations of nonreacting flameholder flows with a zonal grid method
… is widely used to alleviate the difficulties for flow field calculations with complex geometry. In the present study, a patched grid method is employed in the computation of flow fields behind a two-ring flameholder which forms a multiple-connected region. A standard K - ε model is used to close …
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Flow patterns and performance of distillation trays
… tray efficiency depends on the liquid flow pattern, particularly for large diameter trays. Scale·up failures due to liquid channelling have occurred, and it is known that fitting flow control devices to trays sometirr.es improves tray efficiency. Several theoretical models which explain …
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