A5049052304- Lattice Boltzmann Simulation Studies
- Surface Modification and Superhydrophobicity
- Fluid Dynamics and Heat Transfer
- Gastroesophageal reflux and treatments
- Esophageal and GI Pathology
- Biomimetic flight and propulsion mechanisms
- Micro and Nano Robotics
- Fluid Dynamics and Turbulent Flows
- Granular flow and fluidized beds
- Dysphagia Assessment and Management
- Fluid Dynamics and Vibration Analysis
- Microfluidic and Bio-sensing Technologies
- Adhesion, Friction, and Surface Interactions
- Electrohydrodynamics and Fluid Dynamics
- Particle Dynamics in Fluid Flows
- Esophageal Cancer Research and Treatment
- Rheology and Fluid Dynamics Studies
- Icing and De-icing Technologies
- Fluid Dynamics Simulations and Interactions
- Fluid Dynamics and Thin Films
- Elasticity and Material Modeling
- nanoparticles nucleation surface interactions
- Fish Ecology and Management Studies
- Microfluidic and Capillary Electrophoresis Applications
- Advanced Numerical Methods in Computational Mathematics
Northwestern University
2016-2025
McCormick (United States)
2017-2024
Applied Mathematics (United States)
2017
Women & Children's Hospital of Buffalo
2016
Northwestern University
2008-2012
Linde (United States)
2012
Fermi National Accelerator Laboratory
2012
Cryogenic Industries (United States)
2012
Michigan State University
2012
European Organization for Nuclear Research
2012
The apparent contact angle of a drop on rough surface is often modeled using either Wenzel's or Cassie's formulas. Previous experiments are not conclusive regarding which formula to use and when. This information critical in designing superhydrophobic substrate for applications microscale devices. A can occupy multiple equilibrium states. These states denote respective local minima energy. particular shape that attains depends how the formed. We propose design procedure develop accounts...
Surface roughness is known to amplify hydrophobicity. The apparent contact angle of a drop on rough surface often modeled using either Wenzel's or Cassie's formulas. These formulas, along with an appropriate energy analysis, are critical in designing superhydrophobic substrates for applications microscale devices. In this paper we propose that double (or multiple) structures slender pillars geometries develop “self-cleaning” surfaces. key motivation behind the structured mimic microstructure...
Surface roughness is known to amplify hydrophobicity. It observed that, in general, two drop shapes are possible on a given rough surface. These cases correspond the Wenzel (liquid wets grooves of surface) and Cassie (the sits top peaks formulas. Depending geometric parameters substrate, one these has lower energy. not guaranteed, though, that will always exist energy state; rather, state which settle depends typically how formed. In this paper, we investigate transition from another....
The apparent contact angle on a rough surface is usually modeled by either Cassie's or Wenzel's theory. We show, the basis of experimental evidence, that there can be two angles same surface, depending how drop formed. A transition occur between different states an external disturbance. This paper compares theoretical prediction with matching experiments. leads to establishment design criterion for robust hydrophobic which will not change as result
We have developed a numerical scheme to simulate electroosmotic flows in complicated geometries. studied the injection characteristics of cross-channel device for capillary electrophoresis. found that desired rectangular shape sample plug at intersection can be obtained when is carried out high electric field intensities. The also controlled by applying an potential or pressure side reservoirs. Flow induced from channels into channel squeezes streamlines intersection, thus giving less...
Fluid-structure interaction is ubiquitous in nature and occurs at all biological scales. Immersed methods provide mathematical computational frameworks for modeling fluid-structure systems. These methods, which typically use an Eulerian description of the fluid a Lagrangian structure, can treat thin immersed boundaries volumetric bodies, they model structures that are flexible or rigid move with prescribed deformational kinematics. formulations do not require body-fitted discretizations...
An extreme water-repellent surface is designed and fabricated with a hierarchical integration of nano- microscale textures. We combined the two readily accessible etching techniques, standard deep silicon etching, gas phase isotropic (XeF2) for uniform formation double roughness on surface. The synthetic shows hallmarks Lotus effect: durable super water repellency (contact angle>173 degrees) sole existence Cassie state even very large spacing between structures (>1:7.5). directly demonstrate...
A hitherto unknown mechanism for wetting transition is reported. When a pendant drop settles upon deposition, there virtual ``collision'' where its center of gravity undergoes rapid deceleration. This induces high water hammer-type pressure that causes transition. new phase diagram shows both large and small droplets can to wetted states due the deceleration driven previously known Laplace mechanisms, respectively. It explained how attainment nonwetted Cassie-Baxter state more restrictive than known.
Recent experimental work has successfully revealed pressure induced transition from Cassie to Wenzel state on rough hydrophobic substrates. Formulas, based geometric considerations and imposed pressure, have been developed as criteria. In the past, also considered a process of overcoming energy barrier between states. A unified understanding various not apparent. To address this issue, in work, we consolidate criteria with homogenized minimization approach. This approach decouples problem...
Roughness-based superhydrophobic surfaces have been extensively studied over the past decade. The primary objective in most of those studies has to mimic nature, e.g. lotus leaves, produce low-drag and/or self-cleaning surfaces. However, other applications such engineered are being explored. Recent work on using or superhydrophilic for dropwise condensation nucleate boiling heat transfer is highlighted here. It known that as opposed film boiling, and filmwise can lead much higher...
South American electric knifefish are a leading model system within neurobiology. Recent efforts have focused on understanding their biomechanics and relating this to neural processing strategies. Knifefish swim by means of an undulatory fin that runs most the length body, affixed belly. Propelling themselves with enables them keep body relatively straight while swimming, enabling straightforward robotic implementation rigid hull. In study, we examined basic properties swimming through use...
Significance Is a whale or tuna more efficient? The answer depends on the definition of efficiency. If one uses cost transport, defined as energy required to move unit distance, then wins. transporting mass over distance is used We address this ambiguity by rationally deriving new efficiency measure called energy-consumption coefficient ( C E ), which nondimensional fuel consumption. fundamental metric quantify self-propelled bodies analogous drag d ) aerodynamic shapes vehicles. analysis...