Modeling Churn And Annular Flow Regimes In Vertical And Near-Vertical Pipes With Small And Large Diameters,
2016
Louisiana State University and Agricultural and Mechanical College
Modeling Churn And Annular Flow Regimes In Vertical And Near-Vertical Pipes With Small And Large Diameters, Erika Viana Pagan
LSU Master's Theses
This thesis presents an improved model for gas-liquid two-phase flow in churn and annular flow regimes for small- and large-diameter in vertical and near-vertical pipes. This new model assumes that a net liquid film moves upward along the pipe wall and gas phase moves upward, occupying the majority of the central part of the pipes, and forming a gas core, in both flow regimes. The model is validated using field and laboratory experimental data from several different studies from the literature, in terms of pressure along the wellbore or bottomhole pressure for field conditions (for high-pressure flows in long pipes, …
Mathematical Scaling And Statistical Modeling Of Geopressured Geothermal Reservoirs,
2016
Louisiana State University and Agricultural and Mechanical College
Mathematical Scaling And Statistical Modeling Of Geopressured Geothermal Reservoirs, Esmail Ansari
LSU Doctoral Dissertations
The interest for developing geopressured-geothermal reservoirs along the US Gulf Coast is increasing for securing energy needs and reducing global warming. Identifying the most attractive candidate reservoirs for geothermal energy production requires quick and simple models. Analytical models are not always available and simulating each case individually is expensive. The use of scaling and statistical modeling is one approach to translate the output of a simulator into quick models with general applicability at all scales. The developed models can quickly estimate temperature and thermal energy recovery from the geopressured-geothermal reservoirs. These models can screen large databases of reservoirs to select …
Application Of The Variational Fracture Model To Hydraulic Fracturing In Poroelastic Media,
2016
Louisiana State University and Agricultural and Mechanical College
Application Of The Variational Fracture Model To Hydraulic Fracturing In Poroelastic Media, Chukwudi Chukwudozie
LSU Doctoral Dissertations
Hydraulic fracturing has persisted through the use of simple numerical models to describe fracture geometry and propagation. Field tests provide evidence of interaction and merging of multiple fractures, complex fracture geometry and propagation paths. These complicated behaviors suggest that the simple models are incapable of serving as predictive tools for treatment designs. In addition, other commonly used models are designed without considering poroelastic effects even though a propagating hydraulic fracture induces deformation of the surrounding porous media. A rigorous hydraulic fracturing model capable of reproducing realistic fracture behaviors should couple rock deformation, fracture propagation and fluid flow in the both …
Molecular Simulation Study Of Oil Hydrocarbons, Dispersants And Other Organics In Atmospheric Air/Water Interfaces,
2016
Louisiana State University and Agricultural and Mechanical College
Molecular Simulation Study Of Oil Hydrocarbons, Dispersants And Other Organics In Atmospheric Air/Water Interfaces, Zenghui Zhang
LSU Doctoral Dissertations
The main objective of this dissertation is to study the interfacial properties of organic contaminants, in particular green leaf volatiles (GLVs), oil hydrocarbons [mainly intermediate-volatile organic compounds (IVOCs) and semi-volatile organic compounds (SVOCs)], as well as surfactant species (i.e. DOSS and Span 80) from Corexit dispersants at atmospheric air/water and air/seawater interfaces. All these compounds can significantly contribute to the formation of secondary organic aerosols (SOAs). Furthermore, our simulation work on IVOCs, SVOCs and Corexit surfactants, combining with experiments from the Valsaraj group, suggests that these compounds can be adsorbed on the surface of seawater droplets and aerosolized into the …
Impacts Of Rock-Brine Interactions On Petrophysical Properties Of A Sandstone Reservoir, Utilizing Geochemical And Pore Network Modeling,
2016
Louisiana State University and Agricultural and Mechanical College
Impacts Of Rock-Brine Interactions On Petrophysical Properties Of A Sandstone Reservoir, Utilizing Geochemical And Pore Network Modeling, Masoud Safari-Zanjani
LSU Doctoral Dissertations
Unfavorable consequences of geochemical reactions, such as calcite and silica scaling, in geothermal power plant surface facilities have been discussed in many recent studies. However, the impact of brine-rock interactions related to geothermal projects on reservoir properties has not been addressed fully. In this study, interactions between geothermal fluid and reservoir rocks in two fields located in Vermilion Parish, LA, and Chocolate Bayou, TX, are examined using geochemical modeling. The studied reservoir belongs to the Frio formation. In the geochemical models, the brine is cooled down to the estimated output temperature of a geothermal heat exchanger and re-equilibrated. Then, brine-rock …
Development Of Microfluidic Devices To Study Algal Chemotaxis And Long-Term Growth Dynamics,
2016
Louisiana State University and Agricultural and Mechanical College
Development Of Microfluidic Devices To Study Algal Chemotaxis And Long-Term Growth Dynamics, Benjamin Seth Roberts
LSU Master's Theses
Harmful algal blooms pose a threat to human health and the environment. Many complex factors influence their formation and development, and much is still unknown. One major influencing factor that is well-known yet poorly studied is algal chemotaxis. Many studies have examined chemotaxis in other organisms, but very little about chemotaxis in algae has been studied, largely because existing technology and assay techniques are inadequate. Microfluidics offers many possibilities for cell biology, and has been applied to the study of chemotaxis in other organisms already. These techniques can be applied to the study of algal chemotaxis as well. We present …
Expandable Proppants For Hydraulic Fracturing,
2016
Louisiana State University and Agricultural and Mechanical College
Expandable Proppants For Hydraulic Fracturing, Livio Yang Santos
LSU Master's Theses
Hydraulic fracturing is recognized as the primary technique to achieve economic oil and gas production from low permeability reservoirs like shale and tight-sand formations. One of the main challenges facing the oil and gas industry is maintaining the proppant functionality in the subsurface where replacement of proppant is only possible by expensive refracturing operations. Proppant crushing and proppant embedment have posed challenges for sustainable production from stimulated wells especially in soft and deep formations like Haynesville Shales. Experimental measurements show the strong impact of proppant stress and proppant embedment on reducing fracture conductivity. In this work, we introduce a new …
Development Of Single-Well Gas Assisted Gravity Drainage Process For Enhanced Oil Recovery,
2016
Louisiana State University and Agricultural and Mechanical College
Development Of Single-Well Gas Assisted Gravity Drainage Process For Enhanced Oil Recovery, Bikash Deep Saikia
LSU Doctoral Dissertations
EOR application in prolific deepwater Gulf of Mexico (DGOM) reservoirs has remained a challenge. Exorbitant well cost (>200M$) precludes having extensive injection patterns and very characteristics of the reservoirs themselves are partly to blame for negligible EOR activity in DGOM. We have been able to develop and demonstrate a novel design in the form of Single Well – Gas Assisted Gravity Drainage (SW-GAGD) process, which is potentially cost effective, at the same time ensuring very high oil recoveries. In this design, a single well acts as an injector as well as a producer, thereby minimizing well cost. The efficacy …
Design And Analysis Of Geothermal Wellbore Energy Conversion System Working On Zero Mass Withdrawal Principle,
2016
Louisiana State University and Agricultural and Mechanical College
Design And Analysis Of Geothermal Wellbore Energy Conversion System Working On Zero Mass Withdrawal Principle, Ildar Akhmadullin
LSU Doctoral Dissertations
This project is sponsored by the Department of Energy of the United States and dedicated to development of electricity production from the low-enthalpy geothermal reservoirs. The prime interest are reservoirs that are characterized by low temperature of heat source located in deep saline aquifers with high permeable rock. Usually energy production from these resources are not economical by using a conventional binary power plant approach. The presented PhD work is a study of a new system that utilizes a single-well technology and working on supercritical power cycle (PC). The wellbore energy conversion system is operating with Zero Mass Withdrawal (ZMW) …
Molecular Simulation Studies Of Hydrophobins Near Gas, Oil And Water Interfaces,
2016
Louisiana State University and Agricultural and Mechanical College
Molecular Simulation Studies Of Hydrophobins Near Gas, Oil And Water Interfaces, Yuwu Chen
LSU Doctoral Dissertations
This dissertation contains fundamental, classical molecular simulation studies of the properties of hydrophobins (a unique family of surface-active proteins produced by filamentous fungi in soil) near interfaces involving gas, oil, water, organic solvents and polymers. These studies are relevant to possibly using hydrophobins as natural oil dispersants and in processing of polymers. Preliminary studies by the Russo group suggest that these small surface-active proteins can encapsulate oil, gases and polymers in cylindrical structures. We have performed classic molecular dynamics (MD) simulation and potential of mean force (PMF) calculations of a class I hydrophobin EAS using both all-atom and coarse-grained representations. …
Statistical Reservoir Characterization, Simulation, And Optimization Of Field Scale-Gas Assisted Gravity Drainage (Gagd) Process With Uncertainty Assessments,
2016
Louisiana State University and Agricultural and Mechanical College
Statistical Reservoir Characterization, Simulation, And Optimization Of Field Scale-Gas Assisted Gravity Drainage (Gagd) Process With Uncertainty Assessments, Watheq Jasim Mohammed Al-Mudhafar
LSU Doctoral Dissertations
Unlike the Continuous Gas Injection (CGI) and Water-Alternative Gas (WAG), the Gas Assisted Gravity Drainage (GAGD) process takes advantage of the natural segregation of reservoir fluids to provide gravity-stable oil displacement. The gas is injected through existing vertical wells to formulate a gas cap to allow oil and water drain down to the horizontal producer (s). Therefore, the GAGD process was implemented through immiscible and miscible injection modes to improve oil recovery in a sector of the main pay/upper sandstone member in the South Rumaila oil field, located in Iraq. A high-resolution geostatistical reservoir characterization model was constructed to model …
Extensive Sensitivity Analysis And Parallel Stochastic Global Optimization Using Radial Basis Functions Of Integrated Biorefineries Under Operational Level Uncertainties,
2016
Louisiana State University and Agricultural and Mechanical College
Extensive Sensitivity Analysis And Parallel Stochastic Global Optimization Using Radial Basis Functions Of Integrated Biorefineries Under Operational Level Uncertainties, Santiago David Salas Ortiz
LSU Master's Theses
This work presents a decision-making framework for global optimization of detailed renewable energy processes considering technological uncertainty. The critical uncertain sources are identified with an efficient computational method for global sensitivity analysis, and are obtained in two different ways, simultaneously and independently per product pathway respect to the objective function. For global optimization, the parallel stochastic response surface method developed by Regis & Shoemaker (2009) is employed. This algorithm is based on the multi-start local metric stochastic response surface method explored by the same authors (2007a). The aforementioned algorithm uses as response surface model a radial basis function (RBF) for …
The Supercritical Pyrolysis Of 1-Octene,
2016
Louisiana State University and Agricultural and Mechanical College
The Supercritical Pyrolysis Of 1-Octene, Elizabeth Anne Hurst
LSU Master's Theses
In the pre-combustion environment, fuels for future high-speed aircrafts are predicted to take on increasing heat loads in their role as the primary coolant in order to remove excess heat from engine subsystems. While acting in this role, these fuels are expected to experience temperatures and pressures up to 700 °C and 130 atm, conditions which are supercritical for jet fuels and most hydrocarbons. Such extreme conditions can cause fuel decomposition and subsequent pyrolytic reactions, which can lead to the formation of polycyclic aromatic hydrocarbons (PAH). PAH are precursors to solids deposits that clog fuel-delivery lines, causing reduced engine performance …
Floating Constructed Wetland For The Treatment Of Polluted River Water: A Pilot Scale Study On Seasonal Variation And Shock Load,
2016
Edith Cowan University
Floating Constructed Wetland For The Treatment Of Polluted River Water: A Pilot Scale Study On Seasonal Variation And Shock Load, Tanveer Saeed, Biprojit Paul, Rumana Afrin,, Abdullah Al-Muyeed, Guangzhi Sun
Research outputs 2014 to 2021
This paper reports the performance of a pilot scale floating constructed wetland (FCW), employed for the treatment of polluted water collected from Buriganga river in Bangladesh. The FCW system included a tank for accommodating collected water and a floating mat with media, to support the growth of two macrophyte species Phragmites australis and Canna indica. Mean mass removal rates of 0.66, 0.76, 0.08, 0.51, 2.49g/m2d were achieved for ammoniacal nitrogen (NH4-N), total inorganic nitrogen (TIN), phosphorus (P), biochemical oxygen demand (BOD), chemical oxygen demand (COD), respectively by the FCW. Nitrogen removal was via nitrification-denitrification processes, whereas filtration-sedimentation appeared to influence …
Phase Transformation And Deformation Behavior Of Niti-Nb Eutectic Joined Niti Wires,
2016
Edith Cowan University
Phase Transformation And Deformation Behavior Of Niti-Nb Eutectic Joined Niti Wires, Liqiang Wang, Cong Wang, Laichang Zhang, Liangyu Chen, Weijie Lu, Di Zhang
Research outputs 2014 to 2021
NiTi wires were brazed together via eutectic reaction between NiTi and Nb powder deposited at the wire contact region. Phase transformation and deformation behavior of the NiTi-Nb eutectic microstructure were investigated using transmission electron microscopy (TEM) and cyclic loading-unloading tests. Results show that R phase and B19′ martensite transformation are induced by plastic deformation. R phase transformation, which significantly contributes to superelasticity, preferentially occurs at the interfaces between NiTi and eutectic region. Round-shaped Nb-rich phase with rod-like and lamellar-type eutectics are observed in eutectic regions. These phases appear to affect the deformation behavior of the brazed NiTi-Nb region via five …
Synthesis Of Porous Carbon Nanosheets And Its Application In Sodium-Ion Battery,
2015
Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China;
Synthesis Of Porous Carbon Nanosheets And Its Application In Sodium-Ion Battery, Jing-Fei Zhang, Jing Lu, Xiao-Yu Yang, Yun-Di Huang, Lin Xu, Dong-Mei Sun, Ya-Wen Tang
Journal of Electrochemistry
Owning to sodium’s high abundance, relatively low cost, similar chemical properties to Li and very suitable redox potential of E0(Na+/Na) = -2.71 V versus SHE which is only 0.3 V above that of lithium, rechargeable sodium ion battery hold much promise as potential alternatives to current lithium ion batteries for energy storage applications. Carbon material is regarded as the most promising anode candidate for sodium ion battery. Particularly, carbon nanosheet with porous structure and high conductivity is expected to have improved sodium ion storage properties. In this paper, we present a two-step pyrolysis-based method for facile …
Methods For Coating Quartz Crystals,
2015
James Madison University
Methods For Coating Quartz Crystals, William Patrick
Senior Honors Projects, 2010-2019
The goal of this project was to evaluate the effectiveness a procedure that can be used to coat quartz crystal microbalance crystals with titanium dioxide. A successful suspension was created by suspending titanium dioxide powder in poly(acrlic) acid and mixed in an ultra-sonication bath. By utilizing a spin-coater, the TiO2 suspension was successfully dispensed onto a QCM crystal and verified using a surface profiler and microscope. However, after QCM testing, there was no evidence that supports the TiO2 precursor aiding in photocatalytic reactions.
Applying Bayesian Machine Learning Methods To Theoretical Surface Science,
2015
Washington University in St. Louis
Applying Bayesian Machine Learning Methods To Theoretical Surface Science, Shane Carr
McKelvey School of Engineering Graduate Student Theses & Dissertations
Machine learning is a rapidly evolving field in computer science with increasingly many applications to other domains. In this thesis, I present a Bayesian machine learning approach to solving a problem in theoretical surface science: calculating the preferred active site on a catalyst surface for a given adsorbate molecule. I formulate the problem as a low-dimensional objective function. I show how the objective function can be approximated into a certain confidence interval using just one iteration of the self-consistent field (SCF) loop in density functional theory (DFT). I then use Bayesian optimization to perform a global search for the solution. …
In Situ Ir Spectroscopic Investigation Of Noble Metal Catalysts Related To The Reduction Of Automotive Exhaust Emissions,
2015
University of South Carolina - Columbia
In Situ Ir Spectroscopic Investigation Of Noble Metal Catalysts Related To The Reduction Of Automotive Exhaust Emissions, Zhiyong Wang
Theses and Dissertations
The reduction of automotive exhaust emissions has been one of the hottest topics in catalysis community since 1970s. Thanks to the development of three-way catalysts, main auto-exhaust pollutants, such as carbon monoxide, nitrogen oxides and unburned hydrocarbons, can be removed simultaneously. Nowadays, diesel engines and lean-engines become more and more popular due to their high fuel-efficiency and low CO2 emissions. Unfortunately, conventional three-way catalysts are not effective at reducing the NOx emissions from these engines due to the excess oxygen in the exhaust stream. Platinum catalysts were found to be highly active for selective NO reduction with hydrocarbons in excess …
Development Of Highly Active And Stable Hybrid Cathode Catalyst For Pemfcs,
2015
University of South Carolina - Columbia
Development Of Highly Active And Stable Hybrid Cathode Catalyst For Pemfcs, Won Suk Jung
Theses and Dissertations
Polymer electrolyte membrane fuel cells (PEMFCs) are attractive power sources of the future for a variety of applications including portable electronics, stationary power, and automobile application. However, sluggish cathode kinetics, high Pt cost, and durability issues inhibit the commercialization of PEMFCs. To overcome these drawbacks, research has been focused on alloying Pt with transition metals since alloy catalysts show significantly improved catalytic properties like high activity, selectivity, and durability. However, Pt-alloy catalysts synthesized using the conventional impregnation method exhibit uneven particle size and poor particle distribution resulting in poor performance and/or durability in PEMFCs. In this dissertation, a novel catalyst …
