A5041177173- Surface Modification and Superhydrophobicity
- Infection Control and Ventilation
- Particle Dynamics in Fluid Flows
- Microfluidic and Bio-sensing Technologies
- Metal and Thin Film Mechanics
- Electrohydrodynamics and Fluid Dynamics
- Aerosol Filtration and Electrostatic Precipitation
- Plasma Diagnostics and Applications
- nanoparticles nucleation surface interactions
- Inhalation and Respiratory Drug Delivery
- Fluid Dynamics and Thin Films
- Quantum Computing Algorithms and Architecture
- COVID-19 epidemiological studies
- Quantum Information and Cryptography
- Nanopore and Nanochannel Transport Studies
- Fluid Dynamics and Turbulent Flows
- Lattice Boltzmann Simulation Studies
- Microtubule and mitosis dynamics
- Acoustic Wave Resonator Technologies
- 3D Printing in Biomedical Research
- Advanced Sensor and Energy Harvesting Materials
- Fungal and yeast genetics research
- Bacillus and Francisella bacterial research
- Aerodynamics and Acoustics in Jet Flows
- Theoretical and Computational Physics
Institute of High Performance Computing
2013-2025
Agency for Science, Technology and Research
2011-2025
Laboratoire de Dynamique des Fluides
2013
National University of Singapore
2008-2009
Singapore-MIT Alliance for Research and Technology
2009
The ongoing Covid-19 pandemic has focused our attention on airborne droplet transmission. In this study, we simulate the dispersion of cough droplets in a tropical outdoor environment, accounting for effects non-volatile components evaporation. relative humidity, wind speed, and social distancing evaporative transport are investigated. Transmission risks evaluated based SARS-CoV-2 viral deposition person standing 1 m or 2 away from cougher. Our results show that travel distance 100 µm can be...
The Covid-19 pandemic has focused attention on airborne transmission of viruses. Using realistic air flow simulation, we model droplet dispersion from coughing and study the risk related to SARS-CoV-2. Although most droplets are 8-16 $\mu$m in diameter, with highest potential are, fact, 32-40 $\mu$m. Use face masks is therefore recommended for both personal social protection. We found distancing effective at reducing across all sizes. However, presence a human body 1 m away modifies...
Abstract Variational quantum algorithms offer a promising new paradigm for solving partial differential equations on near-term computers. Here, we propose variational algorithm general evolution equation through implicit time-stepping of the Laplacian operator. The use encoded source states informed by preceding solution vectors results in faster convergence compared to random re-initialization. Through statevector simulations heat equation, demonstrate how time complexity our scales with...
In eukaryotes, cytokinesis is accomplished by an actomyosin-based contractile ring. Although in Caenorhabditis elegans embryos larger cells divide at a faster rate than smaller cells, it remains unknown whether similar mode of scalability operates other cells. We investigated the filamentous fungus Neurospora crassa, which exhibits wide range hyphal circumferences. found that N. crassa using actomyosin ring and rings constricted rings. However, unlike C. elegans, total amount myosin remained...
The COVID-19 pandemic has led to many countries oscillating between various states of lock-down as they seek balance keeping the economy and essential services running minimizing risk further transmission. Decisions are made about which activities keep open across a range social settings venues guided only by ad hoc heuristics regarding distancing personal hygiene. Hence, we propose dual use computational fluid dynamic simulations surrogate aerosol measurements for location-specific...
Purpose This study aims to assess the use of variational quantum imaginary time evolution for solving partial differential equations using real-amplitude ansätze with full circular entangling layers. A graphical mapping technique encoding impulse functions is also proposed. Design/methodology/approach The Smoluchowski equation, including Derjaguin–Landau–Verwey–Overbeek potential energy, solved simulate colloidal deposition on a planar wall. performance different types layers and...
We study the dynamical behavior of droplets on a viscoelastic soft substrate. Using thin film approximation for hydrodynamics and time-dependent Winkler’s substrate model, we show numerically how droplet growth depends strongly viscous damping characteristic substrate, leading to asymmetric stick-slip dynamics corroborated by experimental observations. Scaling arguments are presented rationalize radial underlying response limits. an adjacent pair inflating droplets, report diverse...
Nanoscale defects on a substrate affect the sliding motion of water droplets. Using in situ transmission electron microscopy imaging, we visualized depinning dynamics nanodroplets from gold nanoparticles flat SiNx surface. Our observations showed that nanoscale pinning effects nanoparticle oppose lateral forces, resulting stretching, even breakup, nanodroplet. continuum long wave theory, modeled nanodroplet comparable length scales, and model results are consistent with experimental findings...
Abstract The origin of the condensation water begins at nanoscale, a length-scale that is challenging to probe for liquids. In this work we directly image heterogeneous nucleation nanodroplets by in situ transmission electron microscopy. Using gold nanoparticles bound flat surface as sites, observe and growth nanodroplets. nanodroplet radii follows power law: R ( t )~( − 0 ) β , where ~0.2−0.3.
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation H. M. Xia, Z. P. Wang, V. B. Nguyen, S. Ng, W. F. Y. Leong, D. Le; Analyzing the transition pressure viscosity limit of a hydroelastic microfluidic oscillator. Appl. Phys. Lett. 13 January 2014; 104 (2): 024101. https://doi.org/10.1063/1.4861778 Download citation file: Ris (Zotero) Reference Manager EasyBib...
This research investigates how particle parameters, such as zeta potential, size, functional group, material composition, and hydrophobicity affect their affinity deposition of particles onto hair. Streaming potential was used the technique for analysis. The streaming data obtained then converted to surface coverage data. Scanning electron microscopy (SEM) also done visualize localization on hair surface. study found stronger healthy than damaged (oxidatively bleached) hair, due diminished...
We investigate the cyclical stick-slip motion of water nanodroplets on a hydrophilic substrate viewed with and stimulated by transmission electron microscope. Using continuum long wave theory, we show how electrostatic stress imposed non-uniform charge distribution causes pinned convex drop to deform into toroidal shape, shape characterized competition between surface tension drop, as well density which follows Poisson equation. A horizontal gradient in creates lateral driving force, when...
This paper presents an immersed boundary method (IBM) for deformable capsules in incompressible viscous flow. Unlike the conventional IBM, present utilizes unstructured mesh coupled with moving least squares method, which improves performance applications involving a complex geometry. We validate our through independent studies on oscillation and deformation of spherical Our simulations capsule flowing elbow channel show that capillary number affects its shape area significantly. The maximum...
Secondary flows in the form of multivortex structures can occur bifurcation models as result upstream influence. Results from numerical modeling steady inspiratory indicate that, for case a symmetric planar double bifurcation, four counter-rotating vortices develop each grand daughter branches. In this paper, experimental visualization and verification is provided by particle image velocimetry measurements on modified single model. A splitter plate was positioned mother tube so that...
Using dissipative particle dynamics, we simulate an immiscible oil droplet on a polymer brush under channel flow. Above critical flow velocity, the slides surface with contact angle hysteresis. Interestingly, found sliding velocity to be constant across sizes and interphase interactions. Further increase in results detachment liftoff from surface. Under poor solvent conditions, large droplets may deform into airfoil shape, increasing velocity. On oleophilic brush, desorbs spreads, instead of...
The COVID-19 pandemic has spotlit the scientific field of fluid dynamics governing airborne transmission through virus-laden mucosal-salivary droplets. In this work, a mathematical model for droplet dispersion and viral centered on evaporating droplets containing solid residue was proposed. Droplet are influenced by factors such as initial velocity, relative humidity (RH), residue, in agreement with analytical experimental results. Interestingly, maximum distance depends strongly size RH,...
Membrane waves have been observed near the leading edge of a motile cell. Such phenomenon is result interplay between hydrodynamics and adhesive dynamics. Here we consider membrane dynamics on thin fluid gap supported by bonds. Using coupled lubrication theory dynamics, derive an evolution equation to account for tension, bending, adhesion, viscous lubrication. Four adhesion scenarios are examined: no uniform clustered focal adhesion. Two contrasting traveling wave types found, namely,...