78 research outputs found
Simulations of charged droplet collisions in shear flow
Acknowledgments This research has been enabled by the use of computing resources provided by WestGrid, the Shared Hierarchical Academic Research Computing Network (SHARCNET: www.sharcnet.ca), and Compute/Calcul Canada. O.S. thanks NSERC for an Alexander Graham Bell Canada Graduate Scholarship.Peer reviewedPostprin
Flexible hydrogels connecting adhesion and wetting
Raindrops falling on window panes spread upon contact, whereas hail can cause
dents or scratches on the same glass window upon contact. While the former
phenomenon resembles classical wetting, the latter is dictated by contact and
adhesion theories. The classical Young-Dupre law applies to the wetting of pure
liquids on rigid solids, whereas conventional contact mechanics theories
account for rigid-on-soft or soft-on-rigid contacts with small deformations in
the elastic limit. However, the crossover between adhesion and wetting is yet
to be fully resolved. The key lies in the study of soft-on-soft interactions
with material properties intermediate between liquids and solids. In this work,
we translate from adhesion to wetting by experimentally probing the static
signature of hydrogels in contact with soft PDMS of varying elasticity of both
the components. Consequently, we probe this transition across six orders of
magnitude in terms of the characteristic elasto-adhesive parameter of the
system. In doing so, we reveal previously unknown phenomenology and a
theoretical model which smoothly bridges adhesion of glass spheres with total
wetting of pure liquids on any given substrate. Lastly, we highlight how solid
like hydrogels can be treated as potential candidates for cleaning impurities
from conventionally sticky PDMS substrates
Wetting, adhesion and droplet impact on face masks
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright © American Chemical Society after peer review and technical editing by publisher. To access the final edited and published work see https://doi.org/10.1021/acs.langmuir.0c03556.In the present pandemic time, face masks are found to be the most effective strategy against the spread of the virus within the community. As aerosol-based spreading of the virus is considered as the primary mode of transmission, the interaction of masks with incoming droplets needs to be understood thoroughly for an effective usage among the public. In the present work, we explore the interactions of the droplets over the most commonly used 3-ply surgical masks. A detailed study of the wetting signature, adhesion and impact dynamics of water droplets and microbe-laden droplets is carried out for both sides of the mask. We found that the interfacial characteristics of the incoming droplets with the mask are very similar for the front and the back side of the mask. Further, in an anticipated attempt to reduce the adhesion, we have tested masks with a superhydrophobic coating. It is found that a superhydrophobic coating may not be the best choice for a regular mask as it can give rise to a number of smaller daughter droplets and thus can linger in air for longer time and can contribute to the transmission of potential viral loads.NSERC Alliance Grant ALLRP 551068-20, Mitacs Accelerat
IMECE2009-12691 MECHANISM OF CELL TRANSPORT IN A MICROCHANNEL WITH BINDING BETWEEN CELL SURFACE AND IMMOBILIZED BIOMOLECULES
ABSTRACT Recent trends in micro and it is demonstrated that, the bond density and contact area have no effect on the cell velocity behavior beyond the maximum bond density
Inertial Rise in Short Capillaries
In this fluid dynamics video we show capillary rise experiments with diethyl
ether in short tubes. The height of each short tube is less than the maximum
height the liquid can achieve, and therefore the liquid reaches the top of the
tube while still rising. Over a narrow range of heights, the ether bulges out
from the top of the tube and spreads onto the external wall.Comment: Includes 2 videos for the Gallery of Fluid Motion in the 2013
American Physical Society Division of Fluid Dynamics Annual Meetin
Study of natural convection in inclined square enclosure with uniform heat generation.
ABSTRACT Two-dimensional laminar natural convection in an incline
Dynamics of Hot QCD Matter -- Current Status and Developments
The discovery and characterization of hot and dense QCD matter, known as
Quark Gluon Plasma (QGP), remains the most international collaborative effort
and synergy between theorists and experimentalists in modern nuclear physics to
date. The experimentalists around the world not only collect an unprecedented
amount of data in heavy-ion collisions, at Relativistic Heavy Ion Collider
(RHIC), at Brookhaven National Laboratory (BNL) in New York, USA, and the Large
Hadron Collider (LHC), at CERN in Geneva, Switzerland but also analyze these
data to unravel the mystery of this new phase of matter that filled a few
microseconds old universe, just after the Big Bang. In the meantime,
advancements in theoretical works and computing capability extend our wisdom
about the hot-dense QCD matter and its dynamics through mathematical equations.
The exchange of ideas between experimentalists and theoreticians is crucial for
the progress of our knowledge. The motivation of this first conference named
"HOT QCD Matter 2022" is to bring the community together to have a discourse on
this topic. In this article, there are 36 sections discussing various topics in
the field of relativistic heavy-ion collisions and related phenomena that cover
a snapshot of the current experimental observations and theoretical progress.
This article begins with the theoretical overview of relativistic
spin-hydrodynamics in the presence of the external magnetic field, followed by
the Lattice QCD results on heavy quarks in QGP, and finally, it ends with an
overview of experiment results.Comment: Compilation of the contributions (148 pages) as presented in the `Hot
QCD Matter 2022 conference', held from May 12 to 14, 2022, jointly organized
by IIT Goa & Goa University, Goa, Indi
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