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 22 for “"overall heat transfer coefficient"”.
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The use of silicone resins as non-wetting files on heating surfaces
… on the dry resin basis, on (1) the initial overall heat transfer coefficient, (2) the overall heat transfer coefficient under accelerated scale forming conditions, and (3) the corrosion resistance of 1.5” o.d. mild steel evaporator tubes, 12 B.W.G. was investigated. Preliminary tests were …
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The temperature distribution on a rotating cylindrical shell in the presence of a primary radiative source and a reflecting and radiating infinite plane
… The plane is assumed to radiate and reflect heat energy diffusely. Convective heat transfer from the outer surface is neglected, but radially inward heat transfer is present and is governed by a constant overall heat transfer coefficient. The non-linear problem is approximated through a …
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The influence of fin height and wall conductivity on integral-fin tubes during steam condensation
Heat transfer performance of horizontal, integral-fm tubes made of copper, aluminum, copper-nickel, and stainless steel was evaluated using a boiler and steam condenser assembly. Testing was done at vacuum and atmospheric pressure conditions. The tubes tested had an inner diameter of 12.7mm, a root …
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Boiling film coefficients for sulfur dioxide in a vertical evaporator
… of this investigation to determine boiling film coefficients of SO₂ in a temperature range not previously investigated. Further, a practical method of circulating liquid SO₂ and reclaiming SO₂ vapor without a compressor or pump was attained. For the range investigated the boiling film …
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Investigation of the Effect of Superhydrophobic Coatings on the Performance of Heat Exchangers
… on the performance of aluminium louvered fin heat exchangers. A method was developed to prepare superhydrophobic coatings on the exchangers by applying layer of metallic zinc and then reacting the zinc-coated exchanger with silver to electrolessly deposit a microscopically rough silver layer. …
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MSF process modelling, simulation and optimisation : impact of non-condensable gases and fouling factor on design and operation. Optimal design and operation of MSF desalination process with non-condensable gases and calcium carbonate fouling, flexible design operation and scheduling under variable demand and seawater temperature using gPROMS.
… resistance in the flashing chambers in the heat recovery section, heat rejection section, and brine heaters of MSF desalination plants. The effect of seasonal variation of seawater temperature and top brine temperature on the calcium carbonate fouling resistance has been studied throughout …
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Analysis of a Coupled Micro- and Triple-Impingement Cooling Configuration in the C3X Vane
… Stress Transport k(l) turbulence model. The overall goal is to produce a more effective cooling configuration by studying the effects of the flow and heat transfer of the dual configuration, while keeping the integrity of the turbine vane. Star-CCM+ was utilized to carry out the computational …
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Effects of temperature conditions and heat treatment within a multiple effect evaporator on thin stillage fouling characteristics
Heat transfer fouling is the accumulation and formation of unwanted materials on heat transfer surfaces which leads to a decrease in the overall heat transfer coefficient. Fouling of heat transfer equipment increases energy consumption and maintenance costs and thus decreases processing efficiency. …
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Investigation of solid polymeric hollow fiber heat exchange devices for use in thermally-driven desalination processes
The heat exchange between hot brine (4 wt% NaCl) and cold water as well as between condensing steam and cold water without direct fluid-fluid contact using modules made out of solid polymeric hollow fibers of polypropylene (PP) and polyetheretherketone (PEEK) has been studied. The solid hollow …
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Effects of stationary wake on turbine blade heat transfer in a transonic cascade
… by a stationary upstream strut on surface heat transfer to turbine blades were measured experimentally. Time-resolved and unsteady heat flux measurements were made with Heat Flux Microsensors (HFM) at three positions on the suction surface and one position on the pressure surface of a …
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Using inverse regression models to create gray box models for industrial facilities
… determine the physical parameters, specifically overall heat transfer coefficient, surface area, and outdoor air mass flow rate of an industrial building through a simulation-based emulator. A simplified industrial building similar in size, energy usage, and physical parameters as a typical …
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Advanced materials for enhanced condensation heat transfer
… provide significant increases in vapor-side heat transfer coefficient. However, when considering the overall heat transfer coefficient of a surface condenser, we find that most of the benefits of dropwise condensation can be realized by hydrophobic functionalization.
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The effectiveness of antiscalants when used on multi-stage flash distillers.
… an insignificant difference in the values of overall heat transfer coefficient and fouling factor of the heat gain section. Relationships between the parameters controlling the distillate water product to other operating and design parameters are presented. These parameters include plant …
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Electrohydrodynamic Microfabricated Ionic Wind Pumps for Electronics Cooling Applications
… on the collector electrodes enhances the overall heat transfer coefficient and facilitates an IC compatible and batch process. The main purpose of the work presented here is thus to investigate whether an optimized ionic wind pump employed in an array configuration might exhibit …
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The development of a test rig to determine fouling factors of feedwater heaters
Feed water heaters are large shell and tube heat exchangers. They from part of the Rankine cycle used in coal fired power plants with the main purpose being the improvement of the overall cycle efficiency. Like most heat exchangers, feed water heaters suffer from fouling. Fouling is defined as “any …
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Improving the efficiency of domestic ovens
… to predict the efficacy of the design concept. Heat transfer coefficients from literature and a computational fluid dynamics (CFD) simulation were imported into a lumped property model, which predicted that the COI design would reduce both energy consumption and cooking time. Three successive …
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Design, Analysis and Modeling of a Modular Navy Integrated Power and Energy Corridor Cooling System
… conversion, protection, control, isolation, and transfer functions. Central to this system is the integrated Power Electronics Building Block (iPEBB), a self-contained, power-dense converter tailored to manage the ships' stochastic and dynamic loads efficiently. However, realizing the full …
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Design and Operation of Multistage Flash (MSF) Desalination: Advanced Control Strategies and Impact of Fouling. Design operation and control of multistage flash desalination processes: dynamic modelling of fouling, effect of non-condensable gases on venting system design and implementation of GMC and fuzzy control
… the accumulation of fouling which they work as heat insulation materials. As a result, the MSF pumps and the heat transfer equipment are overdesigned and consequently increase the capital cost and decrease the performance of the plants. Moreover, improved process control is a cost effective …
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Keramische Massen für den Niederdruckspritzguss zur Herstellung von Komponenten für die Mikroverfahrenstechnik
In der vorliegenden Arbeit wurden für die endformnahe Fertigung von keramischen Mikrobauteilen auf der Basis von Aluminiumoxid der Einfluss der Feedstock-Zusammensetzung und deren Aufbereitung auf das Abform- und Sinterverhalten untersucht. Neben der Herstellung und rheologischen Bewertung der …
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Fundamentals of microlayer evaporation and its role on boiling heat transfer enhancement
… widely used in industrial applications as it can transfer a large amount of heat over a small surface area. It has been studied for over five decades; however, a comprehensive understanding of the process is still lacking. The bubble ebullition cycle (nucleation, growth and departure) happens over …
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