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 86 for “"pressure drops"”.
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Pressure drops through bubble cap plates
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 1939
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Application of oxygen microbubbles for in situ biodegradation of p-xylene contaminated ground water in a soil column
… soil column and to follow the degradation and pressure drops as a function of time. The next objective was to demonstrate the potential for biodegradation of p-xylene in the presence of ferrous iron and to follow bioremediation and anticipated pressure drops as a function of time. Then, an air …
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Rheological Study of a Direct Liquefaction Feed Slurry
… equation to be used for direct calculation of pressure drop. Calculated values pre dicted the measured data within 10% for the test conditions.</p><p>The investigation used an experimental slurry loop, con sisting of a bank of pipes with nominal sizes ranging from 1 inch (2.54 cm) to 3/8 inch …
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Transfer coefficients over inclined tube banks
… results for shell-side transfer coefficients and pressure drops across four different tube banks, using small-scale models, with yawed tubes, as found in many types of heat exchangers, boilers and nuclear reactors. The tube banks investigated have a staggered tube layout on a rotated square pitch, …
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Mechanisms of secondary dispersions separation in particulate beds
The mechanisms by which drops of secondary liquid dispersion ie. <100μ m, are collected, coalesced and transferred have been studied in particulate beds of different sizes and heights of glass ballotini. The apparatus facilitated different coalescer cell arrangements. The liquid-liquid system was …
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Comparative Analysis of Pressure Mapping Methods in Repaired Tetralogy of Fallot: Four-Dimensional Blood Flow Hemodynamics Assessment and Development of a Novel Pressure Mapping Tool
… the load on the right ventricle, blood flow pressure, and pulmonary hemodynamics. Pressure mapping, obtained through 4D-flow magnetic resonance imaging (4D-flow MRI), has been applied to identify abnormal heart hemodynamics in CHD. Hence, the aim of this research was to compare pressure drop …
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Flow of viscoelastic fluids through banks of cylinders: an experimental and numerical investigation
… it is attempted to determine whether the pressure drop for a polymer melt flowing transversely through a square array of cylinders can be predicted using purely viscous models or whether a viscoelastic constitutive equation is required. To predict these pressure drops, finite element …
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Long short-term memory recurrent neural networks for classification of acute hypotensive episodes
… durich which a patient's mean arterial blood pressure drops below 60 mmHG for a period of 30 minutes. This thesis presents the development and evaluation of a series of Long short-term memory recurrent neural network (LSTM RNN) models which predict whether a patient will experience an AHE or …
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Boiler feed pump low load – leak off recirculation study
… as a leak off valve, experiences a very high pressure difference and cavitation pitting is common due to the water being close to saturation. There are various ways in which the recirculation flow is controlled in the industry such as open orifice, on/off binary type control valves, automatic …
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Optimization of large beaded cellulose as a chromatographic support
… Cellulose beads (1.2 mm diameter) gave pressure drops of less than 1 psi per cm of bed at superficial fluid velocities of 100 cm/min in a 1 5 cm bed. Solids content of greater than about 9% cellulose greatly reduced the permeability of large proteins such as thyroglobulin and p-Amylase …
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Experimental investigation of cavitation using refrigerant in a two-phase flow system
… of fluid from liquid to vapor requires pressure reduction. In this thesis, cavitation of R134a refrigerant is evaluated experimentally. This work is part of an ongoing project that seeks to develop a novel cooling cycle based on the cooling potential of the fluid during cavitation. A …
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Experimental Investigation of a Lean, Premixed Gas Turbine Combustor Using Advanced Laser Diagnostics
… ratios, 0.6 and 0.7, and two combustor pressure drops, 3% and 5%. Time-resolved images were acquired at two axial locations for each test condition, revealing a combustion flow field dominated by large-scale turbulent structures. Stabilization of the flame occurred primarily in the side …
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Design of Fouling-Resistant Coatings for Energy Systems: Theory and Proof of Principle at Realistic Conditions
… geothermal reservoirs, fouling increases system pressure drops, impedes heat transfer, and accelerates corrosion, leading to derating and early failure. Here we propose and demonstrate a design principle for foulant-agnostic thin film (sub-micrometer) coatings, based on minimizing van der Waals …
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The vertical flow centrifugal gas-liquid separator and its application to the removal of gases from geothermal wells
… separation efficiency, and to reduce the overall pressure drop which mainly occurs across the vortex generator. The amount of flashing caused by the vortex generator has been shown to be small. The effects of the various parameters on the separation efficiency are discussed in this report. The …
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Controlling CRUD vapor chimney formation in LWRs through surface modification
… of CRUD can accelerate corrosion, increase pressure drops, cause axial power shifts, and increase radiation dose to workers. In this experiment, we studied the effect of induced microcavity and micropost patterns on CRUD morphology at atmospheric pressure. Samples with various pitches of …
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Multi-variable optimization of pressurized oxy-coal combustion
… behavior such as heat losses, steam leaks, pressure drops, cycle irreversibilities, and other technological and economical considerations. The optimization study involves 16 variables, three of which are integer valued, and 10 constraints with the objective of maximizing thermal efficiency. …
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Compact, Self-Cleaning Wet Electrostatic Precipitators
… harmful particles effectively but cause high pressure drops and need frequent replacements. In this project, we developed a new kind of air-cleaning system. Our design allows air to flow freely through wide gaps between wires, resulting in almost no pressure drop. To capture particles, we use …
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Towards Estimating Friction Factors of Mine Drifts from Low Density Point Clouds
… made popular in 1935 by McElroy to determine pressure drops and energy requirements. The Darcy-Weisbach equation, developed in the 1950s, has been accepted by most other engineering disciplines but lacks critical information for widespread use in underground mines, namely, the friction factor. …
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Investigation of Pin Fin Cooling Channels for Applications in Gas Turbines
… Reynolds number, the RK-E and QRK-E models match pressure coefficient data the closest. An investigation of a biomimicry pin channel created using the undulations observed on seal whiskers also showed improvements in heat transfer levels and reduced pressure drops across the channel. The …
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