Durbar Roy
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View article: Insights into the mechanics of pure and bacteria-laden sessile whole blood droplet evaporation
Insights into the mechanics of pure and bacteria-laden sessile whole blood droplet evaporation Open
We study the mechanics of evaporation and precipitate formation in pure and bacteria-laden sessile whole blood droplets in the context of disease diagnostics. Using experimental and theoretical analysis, we show that the evaporation proces…
View article: Preliminary experimental investigation on the interaction of a subaqueous dune like granular structure with a turbulent open channel flow
Preliminary experimental investigation on the interaction of a subaqueous dune like granular structure with a turbulent open channel flow Open
We study the interaction of a subaqueous dune like granular structure with a turbulent open channel flow experimentally using optical diagnostics in the Shields and Froude parameter space ($0.05{\leq}θ{\leq}0.32$, $0.1{\leq}Fr{\leq}0.4$). …
View article: Evaporation and pathogenesis of levitated bacteria-laden surrogate respiratory fluid droplets: At different relative humidity and evaporation stages
Evaporation and pathogenesis of levitated bacteria-laden surrogate respiratory fluid droplets: At different relative humidity and evaporation stages Open
Hypothesis Aerosols are the principal cause of airborne infections and respiratory diseases. Droplets ejected from the host can evaporate and form a precipitate in the air (aerosol mode), or evaporate for some time, and fall on the ground …
View article: Insights into Transient Dynamics of Bacteria Laden Liquid Bridges
Insights into Transient Dynamics of Bacteria Laden Liquid Bridges Open
We study evaporation and precipitate formation mechanics of bacteria-laden liquid bridge using experimental and theoretical analysis. Aqueous suspension of motile and non-motile Salmonella Typhimurium and Pseudomonas aeruginosa typically f…
View article: Evaporation of bacteria-laden surrogate respiratory fluid droplets: On a hydrophilic substrate vs contact-free environment confers differential bacterial infectivity
Evaporation of bacteria-laden surrogate respiratory fluid droplets: On a hydrophilic substrate vs contact-free environment confers differential bacterial infectivity Open
The transmission of viruses/bacteria causes infection predominantly via aerosols. The transmission mechanism of respiratory diseases is complex, which includes direct or indirect contact, large droplet, and airborne routes apart from close…
View article: Insights into the mechanics of pure and bacteria-laden sessile whole blood droplet evaporation
Insights into the mechanics of pure and bacteria-laden sessile whole blood droplet evaporation Open
We study the mechanics of evaporation and precipitate formation in pure and bacteria-laden sessile whole blood droplets in the context of disease diagnostics. Using experimental and theoretical analysis, we show evaporation process has thr…
View article: Evaporation of bacteria-laden surrogate respiratory fluid droplets: On a hydrophilic substrate versus contact-free environment confers differential bacterial infectivity
Evaporation of bacteria-laden surrogate respiratory fluid droplets: On a hydrophilic substrate versus contact-free environment confers differential bacterial infectivity Open
The transmission of viruses/ bacteria cause infection predominantly via aerosols. The transmission mechanism of respiratory diseases is complex, including direct or indirect contact, large droplet, and airborne routes apart from close cont…
View article: Evaporation of bacteria-laden surrogate respiratory fluid droplets: On a hydrophilic substrate versus contact-free environment confers differential bacterial infectivity
Evaporation of bacteria-laden surrogate respiratory fluid droplets: On a hydrophilic substrate versus contact-free environment confers differential bacterial infectivity Open
The transmission of viruses/ bacteria cause infection predominantly via aerosols. The transmission mechanism of respiratory diseases is complex, including direct or indirect contact, large droplet, and airborne routes apart from close cont…
View article: Future research perspective on the interfacial physics of non-invasive glaucoma testing in pathogen transmission from the eyes
Future research perspective on the interfacial physics of non-invasive glaucoma testing in pathogen transmission from the eyes Open
Non-contact tonometry (NCT) is a non-invasive ophthalmologic technique to measure intraocular pressure (IOP) using an air puff for routine glaucoma testing. Although IOP measurement using NCT has been perfected over many years, various phe…
View article: Insights into bubble droplet interactions in evaporating polymeric droplets
Insights into bubble droplet interactions in evaporating polymeric droplets Open
Polymer droplets subjected to a heated environment have significance in several fields ranging from spray drying and powder formation to surface coating. In the present work, we investigate the evaporation of a high viscoelastic modulus aq…
View article: Future Research Perspective on the Interfacial Physics of Non-Invasive Glaucoma Testing in Pathogen Transmission from the Eyes
Future Research Perspective on the Interfacial Physics of Non-Invasive Glaucoma Testing in Pathogen Transmission from the Eyes Open
Non-contact Tonometry (NCT) is a non-invasive ophthalmologic technique to measure intraocular pressure (IOP) using an air puff for routine glaucoma testing. Although IOP measurement using NCT has been perfected over many years, various phe…
View article: Insights into air cushion dynamics during drop impact on heated substrate at low impact energy
Insights into air cushion dynamics during drop impact on heated substrate at low impact energy Open
We study the air layer dynamics beneath a drop impinging a heated surface at low impact energy using high-speed reflection interferometry imaging and theoretical analysis. The air film has been subdivided into two distinct disjoint regions…
View article: On the thermofluidics of a steady laminar jet impacting on a rotating hot plate: An <i>ab initio</i> scaling perspective
On the thermofluidics of a steady laminar jet impacting on a rotating hot plate: An <i>ab initio</i> scaling perspective Open
We provide an ab initio scaling analysis for liquid film thickness and Nusselt number of a steady laminar jet impinging a rotating heated plate. We have probed the limiting scaling regimes by incorporating the evaporative effects at the li…
View article: On the mechanics of droplet surface crater during impact on immiscible viscous liquid pool
On the mechanics of droplet surface crater during impact on immiscible viscous liquid pool Open
We study drop impacts on immiscible viscous liquid pool and investigate the formation of droplet surface craters using experimental and theoretical analysis. We attribute the formation of air craters to the rapid deceleration of the drople…
View article: Droplet impact on immiscible liquid pool: Multi-scale dynamics of entrapped air cushion at short timescales
Droplet impact on immiscible liquid pool: Multi-scale dynamics of entrapped air cushion at short timescales Open
We have detected unique hydrodynamic topology in thin air film surrounding the central air dimple formed during drop impact on an immiscible liquid pool. The pattern resembles spinodal and finger-like structures typically found in various …
View article: Convolution Neural Networks for Point-of-Care Diagnostics of Bacterial Infections in Blood
Convolution Neural Networks for Point-of-Care Diagnostics of Bacterial Infections in Blood Open
A droplet of blood, when evaporated on a surface, leaves dried residue—the fractal patterns formed on the dried residues can act as markers for infection present in the blood. Exploiting the unique patterns found in the residues of a natur…
View article: Droplet impact on immiscible liquid pool: Multi-scale dynamics of entrapped air cushion at short timescales
Droplet impact on immiscible liquid pool: Multi-scale dynamics of entrapped air cushion at short timescales Open
We have detected unique hydrodynamic topology in thin air film surrounding the central air dimple formed during drop impact on an immiscible liquid pool. The pattern resembles spinodal and finger-like structures typically found in various …
View article: Fluid dynamics of droplet generation from corneal tear film during non-contact tonometry in the context of pathogen transmission
Fluid dynamics of droplet generation from corneal tear film during non-contact tonometry in the context of pathogen transmission Open
Noninvasive ocular diagnostics demonstrate a propensity for droplet generation and present a potential pathway of distribution for pathogens such as the severe acute respiratory syndrome coronavirus 2. High-speed images of the eye subjecte…
View article: The efficacy of vaccines in the context of SARS-CoV-2 and its variants: Role of Spatio-temporal boundary
The efficacy of vaccines in the context of SARS-CoV-2 and its variants: Role of Spatio-temporal boundary Open
The preference for a COVID-19 vaccine, among many available, may be difficult for common people and normally relies on efficacy values reported from clinical trials. Vaccine efficacy depends on statistical data from primary and secondary e…
View article: On the Thermofluidics of a Steady Laminar Jet Impacting on a Rotating Hot Plate: An ab-initio Scaling Perspective
On the Thermofluidics of a Steady Laminar Jet Impacting on a Rotating Hot Plate: An ab-initio Scaling Perspective Open
We provide an ab-initio scaling analysis for liquid film thickness and Nusselt number of a steady laminar jet impacting a rotating heated plate. The limiting scaling regimes incorporating the evaporative effects along the liquid-vapor inte…
View article: Quantitative High-speed Assessment of Droplet and Aerosol From an Eye After Impact With an Air-puff Amid COVID-19 Scenario
Quantitative High-speed Assessment of Droplet and Aerosol From an Eye After Impact With an Air-puff Amid COVID-19 Scenario Open
Purpose: To quantify aerosol and droplets generated during noncontact tonometry (NCT) and assess the spread distance of the same. Methodology: This was an experimental study on healthy human volunteers (n=8 eyes). In an experimental setup,…
View article: Quantitative shadowgraphy of aerosol and droplet creation during oscillatory motion of the microkeratome amid COVID-19 and other infectious diseases
Quantitative shadowgraphy of aerosol and droplet creation during oscillatory motion of the microkeratome amid COVID-19 and other infectious diseases Open
Purpose: To quantify the atomization of liquid over the cornea during flap creation using microkeratome using high-speed shadowgraphy. Setting: Laboratory study. Design: Laboratory investigational study. Method: In an experimental setup, f…
View article: Dynamics of droplet impingement on bioinspired surface: insights into spreading, anomalous stickiness and break-up
Dynamics of droplet impingement on bioinspired surface: insights into spreading, anomalous stickiness and break-up Open
Inspired by the self-cleaning ability of lotus leaves and stickiness (towards water) of rose petals, we investigate the droplet impact dynamics on such bioinspired substrates. Impact studies are carried out with water droplets for a range …
View article: Data files from Dynamics of droplet impingement on bioinspired surface: insights into spreading, anomalous stickiness and break-up
Data files from Dynamics of droplet impingement on bioinspired surface: insights into spreading, anomalous stickiness and break-up Open
Inspired from the self-cleaning ability of the lotus leaves and stickiness (towards water) of rose petals, we investigate the droplet impact dynamics on such bioinspired substrates. Impact studies are carried out with water droplets for a …