Satish Kumar
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View article: Seeing new depths: Three-dimensional flow of a free-swimming alga
Seeing new depths: Three-dimensional flow of a free-swimming alga Open
A swimming microorganism stirs the surrounding fluid, creating a flow field that governs not only its locomotion and nutrient uptake, but also its interactions with other microorganisms and the environment. Despite its fundamental importan…
View article: Maximum spreading of impacting shear-thinning and shear-thickening drops
Maximum spreading of impacting shear-thinning and shear-thickening drops Open
The maximum spreading of an impacting liquid drop is a key metric for characterizing the fundamental fluid process of drop impact. While extensively studied for Newtonian liquids, how far a non-Newtonian drop can spread upon impacting a so…
View article: Maximum spreading of impacting shear-thinning and shear-thickening drops
Maximum spreading of impacting shear-thinning and shear-thickening drops Open
The maximum spreading of an impacting liquid drop is a key metric for characterizing the fundamental fluid process of drop impact. While extensively studied for Newtonian liquids, how far a non-Newtonian drop can spread upon impacting a so…
View article: Behaviour of Cold-Formed Steel–Concrete Composite Beams with Flexible Shear Connectors
Behaviour of Cold-Formed Steel–Concrete Composite Beams with Flexible Shear Connectors Open
View article: Dual State Emissive AIE Active Carbon Dots with Matrix‐Free Room Temperature Phosphorescence
Dual State Emissive AIE Active Carbon Dots with Matrix‐Free Room Temperature Phosphorescence Open
Long‐lived triplet excitons are kingmakers to generate high efficiency optoelectronic OLEDs. However, it is difficult to produce matrix‐free solid state emissive room temperature phosphorescence (RTP) from carbon dots (CDs). In the present…
View article: Shear-induced depinning of thin droplets on rough substrates
Shear-induced depinning of thin droplets on rough substrates Open
Depinning of liquid droplets on substrates by flow of a surrounding immiscible fluid is central to applications such as cross-flow microemulsification, oil recovery and waste cleanup. Surface roughness, either natural or engineered, can ca…
View article: Enhanced condensation kinetics in aqueous microdroplets driven by coupled surface reactions and gas-phase partitioning
Enhanced condensation kinetics in aqueous microdroplets driven by coupled surface reactions and gas-phase partitioning Open
Coupled partitioning, interfacial chemistry and autocatalysis are shown through experiments and kinetic modeling to drive condensation reactions at the air/water interface.
View article: Comparison of one-sided and diffusion-limited evaporation models for thin liquid droplets
Comparison of one-sided and diffusion-limited evaporation models for thin liquid droplets Open
Evaporating sessile droplets are critical to many industrial applications and are also ubiquitous in nature. Two predominant evaporation models have emerged in the literature, one-sided and diffusion-limited, with differing assumptions on …
View article: Nonmodal amplification of disturbances in channel flows of viscoelastic fluids
Nonmodal amplification of disturbances in channel flows of viscoelastic fluids Open
Whether and how channel flows of viscoelastic fluids with weak levels of inertia and initially small-amplitude perturbations can transition to elastic turbulence is a fundamental yet unsettled issue in non-Newtonian fluid mechanics. Standa…
View article: Stability and bifurcation of dynamic contact lines in two dimensions
Stability and bifurcation of dynamic contact lines in two dimensions Open
The moving contact line between a fluid, liquid and solid is a ubiquitous phenomenon, and determining the maximum speed at which a liquid can wet/dewet a solid is a practically important problem. Using continuum models, previous studies ha…
View article: Droplet dynamics under an impinging air jet
Droplet dynamics under an impinging air jet Open
Partially wetting droplets under an airflow can exhibit complex behaviours that arise from the coupling of surface tension, inertia of the external flow and contact-line dynamics. Recent experiments by Hooshanginejad et al. ( J. Fluid Mech…
View article: Capillary flow of evaporating liquid solutions in open rectangular microchannels
Capillary flow of evaporating liquid solutions in open rectangular microchannels Open
Capillary flow of liquids plays a key role in many applications including lab-on-a-chip devices, heat pipes and printed electronics manufacturing. Open rectangular microchannels often appear in these applications, with the lack of a top re…
View article: Understanding viscoelastic flow instabilities: Oldroyd-B and beyond
Understanding viscoelastic flow instabilities: Oldroyd-B and beyond Open
View article: Advances in Melt Blowing Process Simulations
Advances in Melt Blowing Process Simulations Open
Melt blowing is a widely used process for manufacturing nonwoven fiber products with applications spanning healthcare, agriculture, transportation, and infrastructure, among others. The process includes extrusion of a polymer melt through …
View article: Capillary flow of liquids in open microchannels: overview and recent advances
Capillary flow of liquids in open microchannels: overview and recent advances Open
Capillary flow is the spontaneous wicking of liquids in narrow spaces without the assistance of external forces. Examples of capillary flow can be found in numerous applications ranging from controlling and transporting fuel in spacecrafts…
View article: Thin-liquid-film flow on three-dimensional topographically patterned rotating cylinders
Thin-liquid-film flow on three-dimensional topographically patterned rotating cylinders Open
View article: Well-conditioned ultraspherical and spectral integration methods for resolvent analysis of channel flows of Newtonian and viscoelastic fluids
Well-conditioned ultraspherical and spectral integration methods for resolvent analysis of channel flows of Newtonian and viscoelastic fluids Open
View article: Three dimensional flow motions in the viscous sublayer
Three dimensional flow motions in the viscous sublayer Open
We employ novel digital Fresnel reflection holography to capture the 3D flows within the viscous sublayer of a smooth-wall turbulent channel flow at Reτ=400. The measurements reveal unsteady and diverse flow patterns in the sublayer includ…
View article: Capillary-flow dynamics in open rectangular microchannels
Capillary-flow dynamics in open rectangular microchannels Open
View article: Machine learning holography for 3D particle field imaging
Machine learning holography for 3D particle field imaging Open
We propose a new learning-based approach for 3D particle field imaging using holography. Our approach uses a U-net architecture incorporating residual connections, Swish activation, hologram preprocessing, and transfer learning to cope wit…
View article: Modal stability analysis of viscoelastic channel and pipe flows using a well-conditioned spectral method
Modal stability analysis of viscoelastic channel and pipe flows using a well-conditioned spectral method Open
Modal stability analysis provides information about the long-time growth or decay of small-amplitude perturbations around a steady-state solution of a dynamical system. In fluid flows, exponentially growing perturbations can initiate depar…
View article: Scientific basis for high pressure/thermal food processes
Scientific basis for high pressure/thermal food processes Open
Research needs are identified, and an overall strategy is presented for establishing a scientific basis for assessment, design and optimization of processes combining high pressure and moderately high temperatures (HP/T). In an initial pha…
View article: Thermocapillary and electrohydrodynamic effects on the stability of dynamic contact lines
Thermocapillary and electrohydrodynamic effects on the stability of dynamic contact lines Open
Motivated by the need to understand how external fields influence the stability of dynamic contact lines, the linear stability of gravity-driven spreading of a thin liquid film in the presence of electric and temperature fields is studied.…
View article: Amplification of localized body forces in channel flows of viscoelastic fluids
Amplification of localized body forces in channel flows of viscoelastic fluids Open
View article: Improvement in Wear and Thermal Resistance of Disc Brake Rotors using TiAlN Coating
Improvement in Wear and Thermal Resistance of Disc Brake Rotors using TiAlN Coating Open
In present study, it has been understood that the life of Disc Brakes can be increased by improving the Wear and Thermal resistance of Disc Brake rotors. Thus, a specimen of TVS 200 mm Disc Brake rotor was chosen to conduct the tests to sh…
View article: Inverse Leidenfrost Effect: Levitating Drops on Liquid Nitrogen
Inverse Leidenfrost Effect: Levitating Drops on Liquid Nitrogen Open
We explore the interaction between a liquid drop (initially at room temperature) and a bath of liquid nitrogen. In this scenario, heat transfer occurs through film-boiling: a nitrogen vapor layer develops that may cause the drop to levitat…
View article: Micro-ratcheted surfaces for a heat engine biomass conveyor
Micro-ratcheted surfaces for a heat engine biomass conveyor Open
Biomass particles spontaneously self-propel in the direction of asymmetric ratchets above the reactive Leidenfrost temperature.
View article: Fractal and multifractal analysis of the rise of oxygen in Earth’s early atmosphere
Fractal and multifractal analysis of the rise of oxygen in Earth’s early atmosphere Open