A5081900719- Computational Fluid Dynamics and Aerodynamics
- Particle Dynamics in Fluid Flows
- Fluid Dynamics and Turbulent Flows
- Wind and Air Flow Studies
- Icing and De-icing Technologies
- Wind Energy Research and Development
- Surface Modification and Superhydrophobicity
- Plasma and Flow Control in Aerodynamics
- Fluid Dynamics and Heat Transfer
- Aerodynamics and Acoustics in Jet Flows
- Fluid Dynamics and Vibration Analysis
- Gas Dynamics and Kinetic Theory
- Cyclone Separators and Fluid Dynamics
- Aerodynamics and Fluid Dynamics Research
- Aerosol Filtration and Electrostatic Precipitation
- Fluid Dynamics and Mixing
- Adhesion, Friction, and Surface Interactions
- Combustion and flame dynamics
- Aeolian processes and effects
- Granular flow and fluidized beds
- Plant Surface Properties and Treatments
- Electrohydrodynamics and Fluid Dynamics
- Advanced Sensor and Energy Harvesting Materials
- Smart Materials for Construction
- Lattice Boltzmann Simulation Studies
University of Virginia
2016-2025
University of Illinois Urbana-Champaign
2003-2020
Colorado School of Mines
2020
University of Colorado Boulder
2020
Charlottesville Medical Research
2015
Rolls-Royce (United States)
2014
Boeing (Australia)
2009
Gates (United States)
2009
University of Illinois System
1994-2008
Urbana University
2002
We describe a technique to fabricate, for the first time, superoleophobic coatings by spray casting nanoparticle-polymer suspensions. The method involves use of ZnO nanoparticles blended with waterborne perfluoroacrylic polymer emulsion using cosolvents. Acetone is shown be an effective compatibilizing cosolvent produce self-assembling nanocomposite slurries that form hierarchical nanotextured morphology upon curing. Fabricated coating surface investigated environmental scanning electron...
A method to reduce the surface roughness of a spray-casted polyurethane/silica/fluoroacrylic superhydrophobic nanocomposite coating was demonstrated. By changing main slurry carrier fluid, fluoropolymer medium, pretreatment, and spray parameters, we achieved arithmetic values 8.7, 2.7, 1.6 μm on three test surfaces. The surfaces displayed performance with modest variations in skewness kurtosis. level is smoothest yet produced these spray-based techniques. These surfaces, along polished...
A review of compressibility and rarefaction effects on spherical particle drag was conducted based existing experimental data, theoretical limits, direct simulation Monte Carlo method results. The data indicated a nexus point with respect to Mach number Knudsen number. In particular, it found that single coefficient (of about 1.63) is obtained for all conditions when the Reynolds 45, independent or effects. At lower numbers, dominated by rarefaction, at higher compressibility. nexus,...
Innovative technological advancements in the field of orthotics, such as portable powered orthotic systems, could create new treatment modalities to improve functional out come rehabilitation. In this article, we present a novel ankle-foot orthosis (PPAFO) provide untethered assistance during gait. The PPAFO provides both plantar flexor and dorsiflexor torque by way bidirectional pneumatic rotary actuator. system uses power source (compressed carbon dioxide bottle) embedded electronics...
Due to its potential in water-repelling applications, the impact and rebound dynamics of a water drop impinging perpendicular horizontal superhydrophobic surface have undergone extensive study. However, drops tend strike at an angle applications. In such cases, physics governing effects oblique are not well studied or understood. Therefore, objective this study was conduct experiment investigate various liquid viscosities, isothermal environment, on nanocomposite normal conditions (tilted...
A comprehensive review of all relevant experimental data was completed, including recent for the drag coefficient a sphere in supersonic and hypersonic flows. The primary characterization parameter included relative Mach, Knudsen, Reynolds numbers based on velocity, diameter, other parameters. This showed that previously proposed nexus at number below 45 not strictly met, it instead weak transonic bump, which identified numerically first time with present simulations. New continuum-gas...
The inherent intermittency of wind and solar energy challenges the relevance Levelized Cost Energy (LCOE) for their future design since LCOE neglects time-varying price electricity. Valued (COVE) is an improved valuation metric that takes into account time-dependent electricity prices. In particular, it integrates short-term (e.g., hourly) “generation devaluation”, whereby high and/or generation can lead to low, even negative, prices grids with renewable penetration. These aspects are...
The time-varying mismatch between electricity supply and demand is a growing challenge for the market. This difference will be exacerbated with fast-growing renewable energy penetration to grid, due its inherent volatility. Energy storage systems can offer solution this demand-generation imbalance, while generating economic benefits through arbitrage in terms of prices difference. In present study, method estimate potential revenues typical developed. revenue considered as income from plant...
A novel, single-step, environmentally-friendly, water-based, spray-coating approach to obtain superhydrophobic and superoleophobic nanocomposite coatings made from materials with low bioaccumulation.
Abstract Substrate adhesion was investigated experimentally for superhydrophobic coatings fabricated from polyurethane modified with waterborne perfluoroalkyl methacrylic copolymer and a (fatty amine/amino‐silane surface modified) montmorillonite clay nanofiller. The were obtained by spray casting precursor solutions onto aluminum surfaces. Upon thermosetting, initial static water contact angles exceeding 160° angle hysteresis values below 8° measured, yielding antiwetting self‐cleaning...
Recent studies have shown the potential of water-repellent surfaces such as superhydrophobic in delaying ice accretion and reducing adhesion. However, conflicting trends adhesion strength were reported by previous studies. Hence, this investigation was performed to study hydrophobic coatings under realistic atmospheric icing conditions, i.e., supercooled spray 20 μm mean volume diameter (MVD) droplets a freezing (-20 °C), thermally homogeneous environment. The released tensile direction...
Abstract Downwind force angles are small for current turbines systems (1–5 MW) such that they may be readily accommodated by conventional upwind configurations. However, analysis indicates extreme‐scale (10–20 will have larger benefit from downwind‐aligned To examine potential rotor mass reduction, the pre‐alignment concept was investigated a two‐bladed configuration keeping structural and aerodynamic characteristics of each blade fixed (to avoids complete re‐design). Simulations 13.2 MW...