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Numerical investigation of Marine Hydrokinetic Turbines: methodology development for single turbine and small array simulation, and application to flume and full-scale reference models.
A hierarchy of numerical models, Single Rotating Reference Frame (SRF) and Blade Element Model (BEM), were used for numerical investigation of horizontal axis Marine Hydrokinetic (MHK) Turbines. In the initial stage the SRF and BEM were used to simulate the performance and turbulent wake of a flume- and a full-scale MHK turbine ...
Wake Characterization of a Cross-Flow Turbine
A cross-flow turbine wake is analyzed to better understand how these turbines affect the flow field in their immediate vicinity. Mean velocity, turbulence intensity, coherent turbulent kinetic energy, and Reynolds shear stresses are used to identify regions of turbulence and mixing. The shear layer between the turbine wake ...
Thermodynamic Modeling and Mechanical Design of a Liquid Nitrogen Vaporization and Pressure Building Device
The design of a liquid nitrogen vaporization and pressure building device that has zero product waste while recovering some of its stored energy is of interest for the cost reduction of nitrogen for use in industrial processes. Current devices may waste up to 30% of the gaseous nitrogen product by venting it to atmosphere. ...
Heat Transfer and Convective Structure of Evaporating Films under Pressure-Modulated Conditions
This work examines the fluid mechanical and heat transfer characteristics of evaporating films under cyclical superheat conditions. This research was motivated by the need to further understand the instability drivers in films undergoing unsteady and cyclical evaporation. The superheat was controlled modulating the system ...
Design and Optimization of a Compact Low-Cost Optical Particle Sizer
Determining particulate matter (PM) concentrations in ambient air is of major importance in applications of aerosol research; personal exposure assessments, industrial particle monitoring, and air quality studies. Optical particle counters (OPCs) measure the elastic light scattering of individual particles and provide time ...
Experimental Characterization and Fracture Behavior of Graphene Nanocomposites
This work investigates the structural scaling of polymer/graphene nanocomposites. Fracture tests were conducted on geometrically scaled Single Edge Notch Bending (SENB) specimens with varying contents of graphene. It was shown that while the scaling of the pristine polymer follows Linear Elastic Fracture Mechanics (LEFM), ...
Evaluating Embedded Heater Bonding for Composites
Out-of-autoclave bonding of high-strength carbon-fiber composites structures can reduce costs associated with autoclaves. Nevertheless, a concern is whether out-of-autoclave bonding results in a loss of delamination toughness. The main contribution of this paper is to comparatively evaluate the delamination toughness of ...
Numerical Simulation of a Cross Flow Marine Hydrokinetic Turbine
(2012-08-10)
In the search for clean, renewable energy, the kinetic energy of water currents in oceans, rivers, and estuaries is being studied as a predictable and environmentally benign source. We investigate the flow past a cross flow hydrokinetic turbine (CFHT) in which a helical blade turns around a shaft perpendicular to the free ...
Phase Transformations in Free Films
(2013-02-25)
The purpose of this dissertation is to present the derivation of the governing equations for a free-film undergoing phase separation using a long-wavelength approximation to the Navier-Stokes equations coupled with the Cahn-Hilliard equation for phase transformation in a binary liquid. The equations are derived for two cases, ...
TUNABLE TERAHERTZ FISHNET METAMATERIAL
(2012-09-13)
A tunable fishnet metamaterial (TFMM) was designed and fabricated to prove its potential in controlling terahertz radiation (0.1 THz~10THz). A model to retrieve refractive index of single layer fishnet metamaterial (SLFM) was developed and applied to study the tunable frequency range of TFMM. Reference planes that define the ...