Book ChapterDOI
Vorticity Generation Due to Surface Tension-Driven Spreading
Anurag Pant,Baburaj A. Puthenveettil +1 more
- pp 25-32
TLDR
In this paper, the authors study the generation of vorticity at a water-air interface due to the spreading of ethanol-water droplets for ethanol concentrations in the drop ranging from 20% to 100% on the surface of a 50 mm deep water layer.Abstract:
We study the generation of vorticity at a water–air interface due to the spreading of ethanol–water droplets for ethanol concentrations in the drop ranging from \(20\% \le C_{{\text{e}}} \le 100\%\) on the surface of a 50 mm deep water layer. On deposition onto the water layer, the lighter, miscible ethanol droplet spreads as a film on the water surface due to the ethanol–water surface tension difference. Simultaneous to the film spreading, an expanding vortex ring is found below the tip of the spreading film front. The phenomenon in the water layer is visualized using particles, and 2D PIV is used to obtain the velocity field. Vortex regions are identified using the \(\lambda_{2}\) method for various time instants. The average vorticity generation in between the time instants is calculated. A scaling law is proposed for the dimensionless vorticity at a given instant based on the experimental observations.read more
References
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Journal ArticleDOI
On the identification of a vortex
Jinhee Jeong,Fazle Hussain +1 more
TL;DR: In this article, the authors propose a definition of vortex in an incompressible flow in terms of the eigenvalues of the symmetric tensor, which captures the pressure minimum in a plane perpendicular to the vortex axis at high Reynolds numbers, and also accurately defines vortex cores at low Reynolds numbers.
Book
Particle Image Velocimetry: A Practical Guide
TL;DR: In this paper, the authors present a practical guide for the planning, performance and understanding of experiments employing the PIV technique, which is primarily intended for engineers, scientists and students, who already have some basic knowledge of fluid mechanics and nonintrusive optical measurement techniques.
Journal ArticleDOI
Insoluble surfactant spreading on a thin viscous film: Shock evolution and film rupture
TL;DR: In this article, the spreading rate of a localized monolayer of insoluble surfactant on the surface of a thin viscous film, in the limit of weak capillarity and weak surface diffusion, was investigated.
Journal ArticleDOI
Dynamics of spontaneous spreading with evaporation on a deep fluid layer
Anne D. Dussaud,Sandra M. Troian +1 more
TL;DR: In this article, the authors investigated the dynamics of spontaneously spreading volatile films of different vapor pressures and spreading coefficients advancing over the surface of a deep water support and found that the leading edge of volatile, immiscible spreading films also advances as a power law in time, talpha, where alpha ~ 1/2.
Journal ArticleDOI
Marangoni spreading due to a localized alcohol supply on a thin water film
TL;DR: In this article, the authors investigate a Marangoni-driven flow by continuously supplying isopropyl alcohol (IPA) on a film of water, using micron-sized droplets of IPA-water mixtures.