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Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
Surface Tension and Surface Energy01:16

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When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics
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Shape deformations of surface-charged microdroplets.

E Giglio1, B Gervais, J Rangama

  • 1Centre Interdisciplinaire de Recherche Ions Lasers (CIRIL), CEA-CNRS-ENSICAEN, Caen, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 4, 2008
PubMed
Summary

Critically charged glycol and water droplets deform into a lemon shape before charge emission, deviating from the classic Taylor cone model. This finding offers new insights into droplet instability and electrostatic phenomena.

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Area of Science:

  • Physics
  • Physical Chemistry
  • Fluid Dynamics

Background:

  • Rayleigh instability governs the behavior of charged liquid droplets.
  • Understanding droplet deformation is crucial for applications involving electrohydrodynamics.

Purpose of the Study:

  • To investigate the deformation pathway of critically charged glycol and water droplets.
  • To compare experimental observations with numerical simulations of droplet behavior.

Main Methods:

  • Numerical modeling of droplet shape evolution using the velocity potential equation.
  • Solving the Laplace equation for velocity potential via harmonic function expansion.
  • Experimental observation of glycol and water microdroplet deformation.

Main Results:

  • The electrostatic pressure-dominated deformation pathway closely matches experimental data for both glycol and water.
  • Droplet tips, preceding charge emission, exhibit a lemon shape.
  • The droplet tip angle is approximately 39 degrees, narrower than a Taylor cone.

Conclusions:

  • The lemon shape provides a better fit for droplet tips before charge emission than the traditional Taylor cone.
  • The study validates numerical models for predicting charged droplet deformation.
  • Findings advance the understanding of electrostatic instabilities in microdroplets.