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 27 for “"Airlift"”.
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Dynamic planning under uncertainty for theater airlift operations
In this thesis, we analyze intratheater airlift operations, and propose methods to improve the planning process. The United States Air Mobility Command is responsible for the air component of the world wide U.S. military logistics network. Due to the current conflict in Iraq, a small cell within …
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Gas-liquid simulation of an airlift bubble column reactor
Airlift bubble column reactors are finding increasing application on industries such as bioprocess industries. The gas-liquid of two-phase fluid flow system has been carried out to investigate the hydrodynamics parameter. An Eulerian-Eulerian approach was used to model air as the dispersed phase …
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Column generation approaches to the military airlift scheduling problem
In this thesis, we develop methods to address airlift scheduling, and in particular the problem of scheduling military aircraft capacity to meet ad hoc demand. Network optimization methods typically applied to scheduling problems do not sufficiently capture all necessary characteristics of this …
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A modified airlift fiber-bed bioreactor for animal cell culture
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Applied Biological Sciences, 1992.
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Hydro-pneumatic conveying of liquid by means of an airlift pump
Airlift pumps operating in two-phase gas-liquid flow are investigated with a view to establishing an analytical technique to aid in theoretically modelling air-lift pump behaviour. Extensive work on two test facilities constructed at the University of Cape Town's Hydrotransport Research facility …
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Numerical Modeling of Air-Water Flows in Bubble Columns and Airlift Reactors
Bubble columns and airlift reactors were modeled numerically to better understand the hydrodynamics and analyze the mixing characteristics for each configuration. An Eulerian-Eulerian approach was used to model air as the dispersed phase within a continuous phase of water using the commercial …
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Energy Conservation By Intermittently Recirculating and Aerating an Aquaponics System with an Airlift
<p>An airlift device providing aeration and circulation was designed to reduce electrical power requirements for aquaponics by eliminating the need for a water pump. The airlift performed better than predicted and achieved water flow rates of 10 L/min at 25 °C, in comparison to the theoretical …
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Modelling airlift photobioreactors for algal bioenergy, using Scenedesmus sp. as the model species
… work, the production of algal biodiesel using airlift photobioreactors was used as the case study for the model development. Scenedesmus sp. was chosen as the model species owing to its comparatively high lipid productivity, a desirable trait for the production of biofuels. Although many …
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Computational Modeling and Simulations of Hydrodynamics for Air-Water External Loop Airlift Reactors
External loop airlift reactors are widely used for biochemical applications such as syngas fermentation and wastewater treatment. To further understand the inherent gas-liquid flow physics within the reactors, computational modeling and simulations of hydrodynamics for air-water external loop …
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An analytical and experimental investigation of three phase flow in airlift pumps used for diamondiferous marine gravel reclamation
This dissertation covers an investigation on airlift pumps operating in three phase flow. The investigation is specifically geared towards offshore diamond reclamation and the three phases considered are air, water and marine gravels. The purpose of the research was to develop an analytical …
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Tracing particle movement for simulation of light history and algal growth in airlift photobioreactors using Positron Emission Particle Tracking (PEPT)
This Thesis is embargoed. Only the Abstract is available
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Photobioreactor Design for Improved Energy Efficiency of Microalgae Production
… culture circulation and gas exchange with airlift alone and no centrifugal recirculating pump. Traditional tubular PBR designs feature a compressed air supply and a centrifugal pump for culture circulation and gas exchange. Circulation and gas exchange in a closed-system PBR is necessary to …
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Mixing, mass transfer and energy analysis across bioreactor types in microalgal cultivation and lipid production
… with mechanical agitation as an alternative. An airlift photobioreactor was used as a base for comparison with two novel, surface aerated reactors: oscillatory baffled and wave photobioreactors. The three bioreactors were compared in terms of power input, mixing, CO2 mass transfer, algal growth …
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High density animal cell culture systems using porous supports
… a fixed bed ceramic perfusion system, an airlift systemwith draft tube made of porous ceramic and a stirred tank configuration which used porous polystyrene microcarriers. The porous matrices provide an increased surface area for cell attachment and growth and protect the entrapped or …
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The Musical Playground as a Vehicle for Community-building
… and not-for-profit organization, The New Orleans Airlift. Through interviewing over 20 related stakeholders, observing grade four students playing for three consecutive days in the space, and analysis of secondary data, I learned that a musical playground itself can act as a co-composer (Morgan, …
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An investigation into the dynamic implementation of a 16-electrode FDM Electrical Impedance Tomography System
… can be placed in-line with an industrial scale airlift, and used to monitor its flow characteristics. Since the project's conception, a number of researchers have been involved with various stages of its development; the research of G. Teague produced the most noteworthy results and since their …
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Enabling massive parallelism for two-stage stochastic integer optimizations a branch and bound based approach
… to deal with combat delivery, strategic airlift, air refueling, aeromedical evacuation operations, etc. around the world. Our formulation of the airfleet allocation problem for a smaller time horizon shows that annual average cost benefits of 3\% can be obtained by using stochastic …
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Hypolimnetic Aerators: Predicting Oxygen Transfer and Water Flow Rate
… by literature equations developed for external airlift bioreactors.
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Mass flow measurement of multi-phase mixtures by means of tomographic techniques
… flowmeter for the on-line monitoring of an airlift used in an offshore mining application. This requires the measurement of both the individual component volume fractions and their velocities. Tomography provides a convenient non-intrusive technique to obtain this information. Capacitance …
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