163 citations · 550 across the 24 of their papers we have counts for
24 papers
Singularities in Soft Matter Systems
Vatsal Sanjay
When a liquid thread pinches off, its neck thins as it separates into two unconnected regions. Using continuum mechanics, we can predict that the neck reaches zero radius in finite…
Self-similar Worthington jets
José M. Gordillo, Javier Rodríguez-Rodríguez, Vatsal Sanjay
When a micron-sized bubble bursts, capillary waves deform the cavity into a cone that ejects a Worthington jet. The jet is born by inertial focusing, and the local collapse follows…
Confinement-Induced Suppression of Jet Drop Size by Bubble Bursting in Shallow Liquids
Zhengyu Yang, Vatsal Sanjay, C. Ricardo Constante-Amores +1
Bubble bursting is a major source of aerosol generation in a wide range of natural and industrial systems. While the resulting jet dynamics have been extensively studied in deep li…
Bursting bubbles in Herschel-Bulkley fluids: dynamics and jetting transitions
A. H. Ghaemi, Z. Yang, A. Huang +3
When a bubble rises to a free surface, its bursting dynamics in Newtonian fluids are governed by the interplay between viscous, capillary, and gravitational forces. In this work, w…
Stood-up drop to measure receding contact angles
Diego Díaz, Aman Bhargava, Franziska Walz +9
The wetting behavior of drops on natural and industrial surfaces is determined by the advancing and receding contact angles. They are commonly measured by the sessile drop techniqu…
Impacting spheres: from liquid drops to elastic beads
Saumili Jana, John Kolinski, Detlef Lohse +1
A liquid drop impacting a non-wetting rigid substrate laterally spreads, then retracts, and finally jumps off again. An elastic solid, by contrast, undergoes a slight deformation,…
Holes in Sheets: Double-Threshold Rupture of Draining Liquid Films
Ayush K. Dixit, Chunheng Zhao, Stéphane Zaleski +2
Classical rupture is attributed to molecular (van der Waals) forces acting at nanometric thicknesses. Nonetheless, micron-thick liquid sheets routinely perforate far above the scal…
Rheology of Two-Dimensional Dilute Emulsions
Thomas Appleford, Vatsal Sanjay, Maziyar Jalaal
The single droplet under shear is a foundational problem in fluid mechanics. In computational fluid dynamics, the two-dimensional (2D) formulation offers advantages in both computa…
Bouncing microdroplets on hydrophobic surfaces
Jamie Mclauchlan, Jim S. Walker, Vatsal Sanjay +4
Intuitively, slow droplets stick to a surface and faster droplets splash or bounce. However, recent work suggests that on non-wetting surfaces, whether microdroplets stick or bounc…
Implementation of integral surface tension formulations in a volume of fluid framework and their applications to Marangoni flows
Mandeep Saini, Vatsal Sanjay, Youssef Saade +2
Accurate numerical modeling of surface tension has been a challenging aspect of multiphase flow simulations. The integral formulation for modeling surface tension forces is known t…
To jump or not to jump: Adhesion and viscous dissipation dictate the detachment of coalescing wall-attached bubbles
Çayan Demirkır, Rui Yang, Aleksandr Bashkatov +3
Bubble coalescence can promote bubble departure at much smaller sizes compared to buoyancy. This can critically enhance the efficiency of gas-evolving electrochemical processes, su…
Bursting bubble in an elasto-viscoplastic medium
A. G. Balasubramanian, V. Sanjay, M. Jalaal +2
A gas bubble sitting at a liquid-gas interface can burst following the rupture of the thin liquid film separating it from the ambient, owing to the large surface energy of the resu…
Electrolyte spraying within H bubbles during water electrolysis
Aleksandr Bashkatov, Florian Bürkle, Çayan Demirkır +10
Electrolytically generated gas bubbles can significantly hamper the overall electrolysis efficiency. Therefore it is crucial to understand their dynamics in order to optimise water…
Unifying theory of scaling in drop impact: Forces & maximum spreading diameter
Vatsal Sanjay, Detlef Lohse
The dynamics of drop impact on a rigid surface -- omnipresent in nature and technology -- strongly depends on the droplet's velocity, its size, and its material properties. The mai…
Viscoelastic Worthington jets & droplets produced by bursting bubbles
Ayush K. Dixit, Alexandros Oratis, Konstantinos Zinelis +2
Bubble bursting and subsequent collapse of the open cavity at free surfaces of contaminated liquids can generate aerosol droplets, facilitating pathogen transport. After film ruptu…
Focusing of concentric free-surface waves
Lohit Kayal, Vatsal Sanjay, Nikhil Yewale +2
Gravito-capillary waves at free-surfaces are ubiquitous in several natural and industrial processes involving quiescent liquid pools bounded by cylindrical walls. These waves emana…
The role of viscosity on drop impact forces on non-wetting surfaces
Vatsal Sanjay, Bin Zhang, Cunjing Lv +1
A liquid drop impacting a rigid substrate undergoes deformation and spreading due to normal reaction forces, which are counteracted by surface tension. On a non-wetting substrate,…
When does an impacting drop stop bouncing?
Vatsal Sanjay, Pierre Chantelot, Detlef Lohse
Non-wetting substrates allow impacting liquid drops to spread, recoil, and takeoff, provided they are not too heavy (Biance et al. 2006) or too viscous (Jha et al. 2020). In this a…
Drop impact on viscous liquid films
Vatsal Sanjay, Srinath Lakshman, Pierre Chantelot +2
When a liquid drop falls on a solid substrate, the air layer in between them delays the occurrence of liquid--solid contact. For impacts on smooth substrates, the air film can even…
Taylor-Culick retractions and the influence of the surroundings
Vatsal Sanjay, Uddalok Sen, Pallav Kant +1
When a freely suspended liquid film ruptures, it retracts spontaneously under the action of surface tension. If the film is surrounded by air, the retraction velocity is known to a…
Impact forces of water drops falling on superhydrophobic surfaces
Bin Zhang, Vatsal Sanjay, Songlin Shi +4
A falling liquid drop, after impact on a rigid substrate, deforms and spreads, owing to the normal reaction force. Subsequently, if the substrate is non-wetting, the drop retracts…
Non-wetting drop dynamics
Srinath Lakshman, Vatsal Sanjay, Pierre Chantelot +2
The impact of droplets on solids or weakly-deformable surfaces can lead to non-wetting outcomes, depending on the control parameters. Here, we perform experiments and develop a sim…
Bursting Bubble in a Viscoplastic Medium
Vatsal Sanjay, Detlef Lohse, Maziyar Jalaal
When a rising bubble in a Newtonian liquid reaches the liquid-air interface, it can burst, leading to the formation of capillary waves and a jet on the surface. Here, we numericall…
Lifting a sessile oil drop from a superamphiphobic surface with an impacting one
Olinka Ramírez-Soto, Vatsal Sanjay, Detlef Lohse +2
Colliding drops are widely encountered in everyday technologies and natural processes, from combustion engines and commodity sprays to raindrops and cloud formation. The outcome of…