Kirti Chandra Sahu
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View article: Jet breakup dynamics of viscoelastic carboxymethyl cellulose solutions
Jet breakup dynamics of viscoelastic carboxymethyl cellulose solutions Open
We experimentally investigate the breakup dynamics of viscoelastic jets composed of carboxymethyl cellulose (CMC) solutions, focusing on the dripping and Rayleigh regimes at low flow rates. By varying the CMC concentration, needle diameter…
View article: Drop Size Distribution from Laboratory Experiments Based on Single-Drop Fragmentation and Comparison with Aerial In Situ Measurements
Drop Size Distribution from Laboratory Experiments Based on Single-Drop Fragmentation and Comparison with Aerial In Situ Measurements Open
Laboratory experiments and theoretical modeling are conducted to determine the raindrop size distribution (DSD) resulting from distinct fragmentation processes under various upward airstreams. Since weather radar echoes are proportional to…
View article: Droplet breakup morphologies and the resultant size distribution in an opposed-flow airstream at different Weber numbers
Droplet breakup morphologies and the resultant size distribution in an opposed-flow airstream at different Weber numbers Open
The present study investigates the morphology and breakup dynamics of a freely falling drop in a vertical airstream using shadowgraphy and in-line holography. The in-line holography provides the temporal evolution of the volumetric size di…
View article: Evaporation-driven coalescence of two droplets undergoing freezing
Evaporation-driven coalescence of two droplets undergoing freezing Open
We examine the evaporation-induced coalescence of two droplets undergoing freezing by conducting numerical simulations employing the lubrication approximation. When two sessile drops undergo freezing in close vicinity over a substrate, the…
View article: Drop size distribution from laboratory experiments based on single-drop fragmentation and comparison with aerial in-situ measurements
Drop size distribution from laboratory experiments based on single-drop fragmentation and comparison with aerial in-situ measurements Open
Laboratory experiments and theoretical modelling are conducted to determine the raindrop size distribution (DSD) resulting from distinct fragmentation processes under various upward airstreams. Since weather radar echoes are proportional t…
View article: Three-dimensional simulation of film boiling on a horizontal surface with magnetic field
Three-dimensional simulation of film boiling on a horizontal surface with magnetic field Open
This study conducts a numerical investigation into the three-dimensional film boiling of liquid under the influence of external magnetic fields. The numerical method incorporates a sharp phase-change model based on the volume-of-fluid appr…
View article: Three-dimensional simulation of film boiling on a horizontal surface with magnetic field
Three-dimensional simulation of film boiling on a horizontal surface with magnetic field Open
This study conducts a numerical investigation into the three-dimensional film boiling of liquid under the influence of external magnetic fields. The numerical method incorporates a sharp phase-change model based on the volume-of-fluid appr…
View article: Dynamics of jet breakup and the resultant drop size distribution: effect of nozzle size and impingement velocity
Dynamics of jet breakup and the resultant drop size distribution: effect of nozzle size and impingement velocity Open
We conduct systematic experiments to investigate the dynamics of liquid jet breakup and the resulting droplet size distribution, emphasizing the influence of liquid jet velocity and needle exit diameter. We precisely control jet formation …
View article: Evaporation-driven coalescence of two droplets undergoing freezing
Evaporation-driven coalescence of two droplets undergoing freezing Open
We examine the evaporation-induced coalescence of two droplets undergoing freezing by conducting numerical simulations employing the lubrication approximation. When two sessile drops undergo freezing in close vicinity over a substrate, the…
View article: Intricate Evaporation Dynamics in Different Multi-Droplet Configurations
Intricate Evaporation Dynamics in Different Multi-Droplet Configurations Open
We experimentally investigate the evaporation dynamics of an array of sessile droplets arranged in different configurations. Utilizing a customized goniometer, we capture side and top view profiles to monitor the evolution of height, sprea…
View article: Droplet breakup and size distribution in an airstream -- effect of inertia
Droplet breakup and size distribution in an airstream -- effect of inertia Open
We experimentally investigate the morphology and breakup of a droplet as it descends freely from a height and encounters an airstream. The size distributions of the child droplets are analysed using high-speed shadowgraphy and in-line holo…
View article: The use of point of care gastric ultrasound and anesthesia management in pediatric patients with preoperative fasting non-adherence scheduled for elective surgical procedures: a retrospective study
The use of point of care gastric ultrasound and anesthesia management in pediatric patients with preoperative fasting non-adherence scheduled for elective surgical procedures: a retrospective study Open
Background Failure to adhere to perioperative fasting requirements increases aspiration risk and can lead to delay or cancellation of surgery. Point of care gastric ultrasound may guide decision-making to delay, cancel or proceed with surg…
View article: Cracking of submerged beds
Cracking of submerged beds Open
We investigate the phenomena of crater formation and gas release caused by projectile impact on underwater beds, which occurs in many natural, geophysical and industrial applications. The bed in our experiment is constructed of hydrophobic…
View article: Bubble ascent and rupture in mud volcanoes
Bubble ascent and rupture in mud volcanoes Open
Large gas bubbles can reach the surface of pools of mud and lava where they burst, often through the formation and expansion of circular holes. Bursting bubbles release volatiles and generate spatter, and hence play a key role in volcanic …
View article: Application of deep learning and inline holography to estimate the droplet size distribution
Application of deep learning and inline holography to estimate the droplet size distribution Open
We examine five machine learning-based architectures to estimate the droplet size distributions obtained using digital inline holography. The architectures, namely, U-Net, R2 U-Net, Attention U-Net, V-Net, and Residual U-Net are trained us…
View article: Coalescence of non-spherical drops with a liquid surface
Coalescence of non-spherical drops with a liquid surface Open
We employ three-dimensional numerical simulations to explore the impact dynamics of non-spherical drops in a deep liquid pool by varying the aspect ratios $(A_r)$ and Weber numbers $(\We)$. We observe that when a non-spherical drop is gent…
View article: Collision of two drops moving in the same direction
Collision of two drops moving in the same direction Open
The collision dynamics of two drops of the same liquid moving in the same direction has been studied numerically. A wide range of radius ratios of trailing drop and leading drop (Rr) and the velocity ratios (Ur) have been deployed to under…
View article: Collision of two drops moving in the same direction
Collision of two drops moving in the same direction Open
The collision dynamics of two drops of the same liquid moving in the same direction has been studied numerically. A wide range of radius ratios of trailing drop and leading drop ($R_r$) and the velocity ratios ($U_r$) have been deployed to…
View article: Modeling binary collision of evaporating drops
Modeling binary collision of evaporating drops Open
We investigate the interactions between two drops in a heated environment and analyze the effect of evaporation on bouncing, coalescence and reflexive separation phenomena. A reliable mass transfer model is incorporated in a coupled level-…
View article: Freezing of sessile droplet and frost halo formation
Freezing of sessile droplet and frost halo formation Open
The freezing of a sessile droplet unveils fascinating physics, characterised by the emergence of a frost halo on the underlying substrate, the progression of the liquid-ice interface, and the formation of a cusp-like morphology at the tip …
View article: Universal scaling law for electrified sessile droplets on a lyophilic surface
Universal scaling law for electrified sessile droplets on a lyophilic surface Open
Electrified sessile droplets on solid surfaces are ubiquitous in nature as well as several practical applications. Although the influence of electric field on pinned sessile droplets and soap bubbles have been investigated experimentally, …
View article: Data and code for "Bubble ascent and rupture in mud volcanoes"
Data and code for "Bubble ascent and rupture in mud volcanoes" Open
The files in this folder are data and models used in the paper: Bubble ascent and rupture in mud volcanoes by Maxwell L. Rudolph, Kirti Chandra Sahu, Nikos Savva, András Szilágyi, Zoltán Hórvölgyi, Péter Márton, Ádám Tajti, Károly Szép, Bo…
View article: Data and code for "Bubble ascent and rupture in mud volcanoes"
Data and code for "Bubble ascent and rupture in mud volcanoes" Open
The files in this folder are data and models used in the paper: Bubble ascent and rupture in mud volcanoes by Maxwell L. Rudolph, Kirti Chandra Sahu, Nikos Savva, András Szilágyi, Zoltán Hórvölgyi, Péter Márton, Ádám Tajti, Károly Szép, Bo…
View article: Public health monitoring of behavioural risk factors in USA: An exploratory study
Public health monitoring of behavioural risk factors in USA: An exploratory study Open
Background The COVID-19 pandemic's restrictions had a significant impact on behavioural markers such as physical, sedentary and sleep activity. The Behavioral Risk Factor Surveillance System is a key data source for public health surveilla…
View article: An investigation on the impact of two vertically aligned drops on a liquid surface
An investigation on the impact of two vertically aligned drops on a liquid surface Open
The dynamics of two vertically coalescing drops and a pool of the same liquid have been investigated using a Coupled Level Set and Volume of Fluid (CLSVOF) method. Such a configuration enables us to study the dynamic interaction of an arbi…
View article: Dynamics of an evaporating drop migrating in a Poiseuille flow
Dynamics of an evaporating drop migrating in a Poiseuille flow Open
The evaporation of a liquid drop of initial diameter (Ddrop) migrating in a tube of diameter (D0) is investigated using the coupled level set and volume of fluid (CLSVOF) method focusing on determining the heat and mass transfer coefficien…