Related Experiment Video
Updated: Jul 17, 2026

Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions
Published on: February 17, 2019
Comment on "Two touching spherical drops in uniaxial extensional flow: analytic solution to the creeping flow
Internal circulation within drops does not significantly affect liquid film drainage between them during straining flow, contrary to previous findings. This study re-evaluates drop dynamics and fluid flow interactions.
Area of Science:
- Fluid dynamics
- Colloid science
- Interfacial phenomena
Background:
- Previous research by Baldessari and Leal suggested negligible influence of internal drop circulation on thin film drainage.
- The study analyzed tangent spherical drops in a straining flow environment.
Discussion:
- This letter challenges the prior conclusion regarding the negligible impact of internal circulation.
- It highlights potential inaccuracies in the previous analysis of drop-scale hydrodynamics.
- The influence of ambient flow on internal circulation and its subsequent effect on film drainage is re-examined.
Key Insights:
- Internal circulation within drops can significantly influence the drainage of the thin liquid film between them.
- The assumption of negligible influence is shown to be incorrect under specific conditions.
- Re-evaluation of fluid flow dynamics is crucial for accurate predictions.
Outlook:
- Further investigation into the complex interplay between internal circulation and film drainage is warranted.
- This work may necessitate revisions in models predicting droplet behavior in flowing systems.
- Understanding these dynamics is critical for applications involving emulsions and suspensions.
More Related Videos
10:28Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
Published on: January 3, 2014
09:37Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole
Published on: August 26, 2019
Related Concept Videos
Eulerian and Lagrangian Flow Descriptions
The Eulerian method focuses on fixed points in space where fluid properties, such as velocity, pressure, and temperature, are observed as the fluid moves between these...
Couette Flow
Newtonian Fluid: Problem Solving
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
Stokes' Law
The expression for the force on a solid spherical object in a fluid is called Stokes' law. Stokes' law is valid only for low Reynolds...
Uniform Depth Channel Flow: Problem Solving
Steady, Laminar Flow in Circular Tubes