Rohit Pillai

Rohit Pillai
The University of Edinburgh | UoE · School of Engineering

Ph.D.

About

17
Publications
2,832
Reads
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118
Citations
Additional affiliations
September 2018 - present
The University of Edinburgh
Position
  • Lecturer
December 2016 - August 2018
The University of Edinburgh
Position
  • PostDoc Position
Education
July 2012 - November 2016
University of Melbourne
Field of study
  • Department of Chemical and Biomolecular Engineering

Publications

Publications (17)
Chapter
Ice formation on surfaces is a common phenomenon occurring in the presence of water at temperatures below the freezing point, and can negatively impact many aspects of our lives. Atmospheric icing, which forms due to the natural presence of water as small liquid drops or vapor in the air, can cause damage to ground transportation, airplanes, power...
Article
Ice accumulation on solid surfaces is a severe problem for safety and functioning of a large variety of engineering systems, and its control is an enormous challenge that influences the safety and reliability of many technological applications. The use of molecular dynamics (MD) simulations is popular, but as ice nucleation is a rare event when com...
Article
Carbon nanotubes (CNTs) have long been heralded as the material of choice for next-generation membranes. Some studies have suggested that boron nitride nanotubes (BNNTs) may offer higher transport of pure water than CNTs, while others conclude otherwise. In this work, we use a combination of simulations and experimental data to uncover the causes o...
Article
Full-text available
Ultrasonic surface vibration at high frequencies ( O (100 GHz)) can nucleate bubbles in a liquid within a few nanometres from a surface, but the underlying mechanism and the role of surface wettability remain poorly understood. Here, we employ molecular simulations to study and characterize this phenomenon, which we call acoustothermal nucleation....
Article
Full-text available
A domain-decomposed method to simultaneously couple the classical Molecular Dynamics (MD) and Direct Simulation Monte Carlo (DSMC) methods is proposed. This approach utilises the MPI-based general coupling library, the Multiscale Universal Interface. The method provides a direct coupling strategy and utilises two OpenFOAM based solvers, mdFoam+ and...
Conference Paper
Full-text available
This work uses a new open-source code coupling library, the Multiscale Universal Interface (MUI)[1], to connect together solvers built in OpenFOAM, mdFoam+[2] (a molecular dynamics solver) and dsmcFoam+[3] (a direct simulation Monte Carlo solver) with a view to then connecting these to parametrise a macroscopic CFD simulation.
Article
Full-text available
We report nonequilibrium molecular simulations of the vibration-induced heating of nanoscale-thick water layers on a metal substrate. In addition to experimentally confirmed acoustothermal evaporation, we observe hitherto unmapped nucleate and film boiling regimes, accompanied by the generation of unprecedented heat fluxes [∼O(109) W/m2]. We develo...
Article
We report the results of molecular dynamics investigations into the behaviour of nanoscale water droplets on surfaces subjected to cyclic-frequency normal vibration. Our results show, for the first time, a range of vibration-induced phenomena, including the existence of the following different regimes: evaporation, droplet oscillation, and droplet...
Article
Coalescence of charged drops in the presence of an electric field has practical applications in microscale lab-on-a-chip devices. Existing studies have focused on macrodrops, but electrophoretic charge behaviour differs for microdrops due to the increased thickness of diffuse charge layers relative to drop dimensions. An electrokinetic model is use...
Article
Full-text available
Binary drop electrocoalescence is the process of inducing two drops, suspended in an immiscible fluid, to coalesce in the presence of an external electric field. Electric forces have been known to accelerate the rupture of the interfacial film and enhance drop coalescence but the process has not been well characterized. The effects of the drop ion...
Article
Using a recently developed multiphase electrokinetic model, we simulate the transient electrohydrodynamic response of a liquid drop containing ions, to both small and large values of electric field. The temporal evolution is found to be governed primarily by two dimensionless groups: (i) Ohnesorge number (Oh), a ratio of viscous to inertio-capillar...
Conference Paper
Full-text available
Coalescence of charged drops in the presence of an electric field has practical applications in droplet based microfluidic devices. Existing studies have focused on macrodrops, but electrophoretic charge behaviour differs for microdrops. An electrokinetic model is used in this study to numerically investigate the charge transfer dynamics, for the p...
Article
Full-text available
The authors’ volume-of-fluid based electrokinetic flow model for multiphase flow with fluid–fluid interfaces, recently extended by them to allow for interfacial charge, is refined and more comprehensively validated under dynamic conditions. Validation is performed using (i) an analytical solution for drop relaxation in the presence of ions and inte...
Article
Full-text available
The deformation and breakup of an axisymmetric, conducting drop suspended in a nonconducting medium and subjected to an external electric field is numerically investigated here using an electrokinetic model. This model uses a combined level set-volume of fluid formulation of the deformable surfaces, along with a multiphase implementation of the Ner...
Conference Paper
Full-text available
In this paper, charge separation behaviour inside a microscale drop of water suspended in oil is studied using a novel electrokinetic model [1], which allows for conduction, convection and diffusion of ions inside the drop. The interfacial tension and electric field are varied and its effects on charge separation studied. It is shown that the conce...
Conference Paper
According to a cautious estimate, approximately 10% of the energy available at the crankshaft in a diesel operated vehicle is used for operating the compressor of the vehicle's air-conditioning system. This is a huge loss if one takes into account the fact that the thermal efficiencies of most diesel operated vehicles range from 20-30% when in pris...

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