A5102753528- Surface Modification and Superhydrophobicity
- Fluid Dynamics and Thin Films
- Fluid Dynamics and Heat Transfer
- Electrohydrodynamics and Fluid Dynamics
- Surfactants and Colloidal Systems
- Groundwater flow and contamination studies
- Reservoir Engineering and Simulation Methods
- Hydraulic Fracturing and Reservoir Analysis
- Avian ecology and behavior
- Particle Dynamics in Fluid Flows
- Fluid Dynamics and Turbulent Flows
- Textile materials and evaluations
- Aeolian processes and effects
- Spacecraft and Cryogenic Technologies
- Modular Robots and Swarm Intelligence
- Icing and De-icing Technologies
- Nanomaterials and Printing Technologies
- Planetary Science and Exploration
- Interactive and Immersive Displays
- Animal Vocal Communication and Behavior
- Plant Surface Properties and Treatments
- Marine animal studies overview
Massachusetts Institute of Technology
2014-2015
University of Alberta
2009-2014
Alberta Hospital Edmonton
2014
We demonstrate a reduction in the measured inner wall shear stress moderately turbulent Taylor-Couette flows by depositing sprayable superhydrophobic microstructures on rotor surface. The magnitude of becomes progressively larger as Reynolds number increases up to value 22% at $\mathrm{Re}=8.0\ifmmode\times\else\texttimes\fi{}1{0}^{4}$. show that mean skin friction coefficient ${C}_{f}$ presence coating can be fitted modified Prandtl--von K\'arm\'an--type relationship form...
A balance of surface science and aerodynamic knowledge is brought to bear elucidate the fundamental parameters determining incipient motion (runback) for a drop exposed shearing airflow. It was found that wetting such as contact angle are very influential in minimum required air velocity shedding. On basis experimental results drops water hexadecane (0.5-100 microL) on PMMA, Teflon, superhydrophobic aluminum surface, an exponential function proposed relates critical shedding ratio base...
Despite the practical need, no models exist to predict contact angles or wetting mode of surfactant solutions on rough hydrophobic superhydrophobic surfaces. Using Gibbs' adsorption equation and a literature isotherm, new model is constructed based Wenzel Cassie equations. Experimental data for aqueous sodium dodecyl sulfate (SDS) smooth Teflon surfaces are fit estimate values coefficients in model. these coefficients, predictions as function topological f (Cassie) r (Wenzel) factors SDS...
This paper resolves questions in the literature regarding autophilic effect (i.e., movement of surfactant past advancing contact line-leading to an increase drop radius beyond that due advance) and its importance quasi-static sessile wetting. Various systems (SDS, HTAB, MEGA 10 solutions at three concentrations each pure water ethylene glycol on hydrophobic Teflon OTS-coated silicon) are probed determine existence, time constant, magnitude effect, using receding drops. From spreading results...
Using Gibbs' adsorption equation and a literature isotherm, new general model to predict the contact angle of surfactant solutions on (smooth or rough) chemically heterogeneous surfaces is constructed based Cassie equation. The allows for at liquid-vapor, solid-liquid, solid-vapor interfaces. Solid-vapor allowed in order autophobic effect hydrophilic surfaces. representative values coefficients which describe each interface, predictions angles as function f parameters (area fractions)...