Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Institution
- Keyword
-
- 1 (1)
- Bidispersity (1)
- Biogas (1)
- Carbon dioxide (1)
- Combustion model (1)
-
- Corner separation (1)
- Droplet Deformation; Electrocoalescence; Surfactant; Surface Dilatational Viscosity; Asphaltenes; Langmuir Isotherm (1)
- Enhanced oil recovery (1)
- Fluid mechanics (1)
- Friction (1)
- HCCI (1)
- Heat (1)
- Horseshoe vortex (1)
- Hydrogen sulfide (1)
- Interference drag (1)
- Junction flow interactions (1)
- Junction flows (1)
- Metal extraction (1)
- Microgel flooding (1)
- Nanoparticles-stabilized foams (1)
- Neural network (1)
- Oil-water interfaces (1)
- Particle image velocimetry (1)
- Reaction mechanism (1)
- Scaling (1)
- Shear thickening (1)
- Supercritical (1)
- Surface instabilities (1)
- Suspension rheology (1)
- Transfer (1)
- Publication
- Publication Type
Articles 1 - 9 of 9
Full-Text Articles in Complex Fluids
Effect Of Hydrogen Sulfide Content On The Combustion Characteristics Of Biogas Fuel In Homogenous Charge Compression Ignition Engines, Mohammad Alrbai, Adnan Darwish Ahmad, Sameer Al-Dahidi, Ahmad M. Abubaker, Loiy Al-Ghussain, Hassan S. Hayajneh, Nelson Akafuah
Effect Of Hydrogen Sulfide Content On The Combustion Characteristics Of Biogas Fuel In Homogenous Charge Compression Ignition Engines, Mohammad Alrbai, Adnan Darwish Ahmad, Sameer Al-Dahidi, Ahmad M. Abubaker, Loiy Al-Ghussain, Hassan S. Hayajneh, Nelson Akafuah
Institute of Research for Technology Development Faculty Publications
The use of biogas fuel in homogeneous charge compression ignition (HCCI) engines has been promoted recently due to the environmental advantages. However, hydrogen sulfide (H2 S) forms a non-environment friendly content and biogas impurity that its removal is associated with high costs. In this study, the effect of using biogas fuel in the HCCI engines under different operating conditions is investigated to shed light on the best scenarios of biogas combustion, even with the presence of H2S contents. A modified reaction mechanism is introduced by considering the re- actions of H2 S with other species in the air-fuel mixture. The …
Artificial Neural Network For Predicting Heat Transfer Rates In Supercritical Carbon Dioxide, Vinusha Dasarla Giri Babu
Artificial Neural Network For Predicting Heat Transfer Rates In Supercritical Carbon Dioxide, Vinusha Dasarla Giri Babu
Doctoral Dissertations and Master's Theses
Supercritical carbon dioxide as a working fluid in a closed Brayton cycle is proving to be more efficient than a conventional steam-based Rankine engine. Understanding the heat transfer properties of supercritical fluids is important for the design of a working engine cycle. The thermophysical properties of supercritical fluids tend to vary non-linearly near the pseudo-critical region. Traditionally, empirical correlations are used to calculate the heat transfer coefficient. It has been shown in the literature and within our own studies that these correlations provide inaccurate predictions near the pseudo-critical line, where heat transfer may be deteriorated or enhanced, resulting from strong …
Surface-Driven Instabilities At Oil-Water Interfaces, Anelisse Claros Mendieta
Surface-Driven Instabilities At Oil-Water Interfaces, Anelisse Claros Mendieta
Graduate Theses and Dissertations
Fluid-fluid interactions are such a wide area and can be observed in different scenarios such as geothermal systems, waterflooding of reservoirs, oil recovery, and water treatment processes. This thesis aims to deepen the understanding of fluid-fluid interactions which include Marangoni flows, charge related instabilities, and surface activity. This thesis studied the interactions of micrometer-sized droplets of an oil (toluene) with surfactant Di-(2-ethylhexyl) phosphoric acid (DEHPA) in the aqueous phase. One of the main goals is to understand several surface-driven instabilities and how those can be manipulated for future applications.Furthermore, this thesis aims to use these oil-surfactant droplets as a medium …
Understanding Unsteady Corner Separation Within Wing-Body Junction Flows, Paul G. Winner
Understanding Unsteady Corner Separation Within Wing-Body Junction Flows, Paul G. Winner
Doctoral Dissertations and Master's Theses
Wing-body junction flows, formed at the interface between a wing and fuselage surface, are a complex, coupled, three-dimensional, turbulent flow field. This thesis focused on the unsteady corner separation that develops at the trailing edge of this wing-body junction under certain conditions. A NACA 0015 wing mounted on a flat plate at an angle of attack of 13°was used as the model junction flow field. The wing had an aspect ratio of 8 with a linear washout twist of 15°. The Reynolds number based on the wing chord was Rec = 4.5 × 105. Time-dependent stereoscopic particle …
Studies Of Multiphase Distribution And Flow In Bubble/ Slurry Bubble Columns With /Without Internals And Advanced Sustainable Construction Materials Using Sophisticated Measurement Techniques, Omar Farid
Doctoral Dissertations
"Bubble/slurry bubble columns have been widely studied and employed as multiphase flow reactors with and without vertical heat-exchanging tubes. In order to understand more deeply the effect of the dense internals on the hydrodynamics of bubble/slurry bubble column, systematic experiments were performed to visualize and quantify using the radioactive particle tracking (RPT) technique. A new methodology for implementing the radioactive particle tracking (RPT) technique has been developed to investigate the effect of the dense internals on the hydrodynamics of the bubble/slurry column reactor. Monte Carlo N-Particle (MCNP) simulation has been implemented to simulate the system to generate a large number …
Matlab Model To Predict Liquid Hydrogen Spill Characteristics And Safety, Amy Gravenstein
Matlab Model To Predict Liquid Hydrogen Spill Characteristics And Safety, Amy Gravenstein
Williams Honors College, Honors Research Projects
The potential of using liquid hydrogen for propulsion is often undermined due to its perilous nature. Hydrogen has a wide flammability range when mixed with air (4.0 - 75.0% hydrogen) and a low ignition energy (0.019 mJ). Liquid hydrogen adds to this high risk as a cryogenic fluid that is to be maintained below -22 K. A liquid hydrogen model has been created in MATLAB that can model various spill scenarios from cryogenic liquid hydrogen vessels. This model takes into consideration the spill rate, spill temperature, air temperature, duration of spill, and air flow conditions to calculate the mass accumulation, …
Fundamentals Of Microgel Flooding And Nanoparticles-Stabilized Foams In Enhanced Oil Recovery, Shuaijun Li
Fundamentals Of Microgel Flooding And Nanoparticles-Stabilized Foams In Enhanced Oil Recovery, Shuaijun Li
Dissertations and Theses
For centuries oil has remained a critical energy source for human civilization. After years of extraction, many oil fields have reached or are reaching a decline stage of production, even though up to a half of the total crude oil reserves in these fields has not been recovered yet. One reason is due to the structural heterogeneity of the oil reservoirs—reservoirs may consist of regions of higher permeability with larger pore size and regions of lower permeability with smaller pore size. Displacing fluids tend to flow through large permeability zones only without reaching the oil trapped in low permeability region; …
Droplets In An Electric Field: Surface Rheology, Coalescence And Rebound, Yu Han
Droplets In An Electric Field: Surface Rheology, Coalescence And Rebound, Yu Han
Dissertations and Theses
Electrocoalescence is the process in which pairs of conducting droplets suspended in a continuous dielectric (nonconducting) liquid phase are drawn together and merge upon the application of an electric field. The electric field polarizes each of the droplets in the field direction. The polarization causes the drops to deform and drives a dipolar attraction which forces them to approach each other and coalesce. Many technologies use electric fields to manipulate fluid dispersions. Electrocoalescence is an essential unit operation for separating water droplets in a crude oil. This water in oil emulsion is stabilized by surfactants, such as asphaltenes, resins and …
Shear Thickening In Dense Bidisperse Suspensions By Dynamic Simulation, Nelya Malbranche
Shear Thickening In Dense Bidisperse Suspensions By Dynamic Simulation, Nelya Malbranche
Dissertations and Theses
Shear thickening, which corresponds to an increase of viscosity with shear rate, is ubiquitously observed in many concentrated suspensions and, as such, has implications for many industrial materials and geological phenomena. Controlling shear thickening is of significant importance, and many studies have been devoted to it. Recent works link shear thickening to the shear-induced transition from a lubricated particle interaction at low shear stress to a predominantly frictional interaction at high stress. In this dissertation, we investigate bidispersity and focus on mechanisms contributing to the viscosity evolution in rate-dependent suspensions, something that has not been addressed before. We perform detailed …