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Related Concept Videos

Two Components: Liquid–Liquid Systems01:27

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A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
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Nonideal Two-Component Liquid Solutions01:29

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Nonideal liquid solutions, also known as real solutions, do not strictly follow Raoult's law. Raoult's law is a rule of thumb in physical chemistry. However, not all mixtures adhere to this law due to varying molecular interactions. For example, in an acetone/chloroform solution, the individual vapor pressures of the components are lower than expected, resulting in a total vapor pressure below that predicted by Raoult's law, causing a negative deviation.On the other hand, in an ethanol/water...
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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Convective Instabilities in Two Liquid Layers.

G B McFadden1, S R Coriell1, K F Gurski2

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899-8910.

Journal of Research of the National Institute of Standards and Technology
|April 26, 2016
PubMed
Summary
This summary is machine-generated.

We analyzed fluid bilayer stability, considering buoyancy and temperature gradients. Instability mechanisms depend on fluid properties and layer configurations, including Rayleigh-Taylor effects.

Keywords:
Benard convectionMarangoni convectionRayleigh-Taylor convectionbenzene-water systemfluid bilayershydrodynamic stability

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Area of Science:

  • Fluid dynamics
  • Instability phenomena
  • Interfacial phenomena

Background:

  • Horizontal fluid bilayers are susceptible to instabilities driven by various forces.
  • Understanding these instabilities is crucial for applications in material processing and microfluidics.
  • Buoyancy and thermocapillary effects, particularly under temperature gradients, significantly influence bilayer stability.

Purpose of the Study:

  • To conduct linear stability calculations for horizontal fluid bilayers.
  • To investigate the roles of buoyancy and thermocapillary effects in vertical temperature gradients.
  • To analyze the mechanisms behind long-wavelength and short-wavelength instabilities.

Main Methods:

  • Linear stability analysis.
  • Asymptotic analyses for long-wavelength and short-wavelength regimes.
  • Numerical calculations using benzene-water system parameters.

Main Results:

  • The long-wavelength instability mechanism is complex and depends on Crispation and Bond numbers.
  • The analysis encompasses conventional Rayleigh-Taylor instability for stratified fluids.
  • Numerical simulations validate theoretical findings for a specific fluid pair.

Conclusions:

  • Fluid bilayer stability is governed by a combination of buoyancy, thermocapillarity, and fluid properties.
  • The interplay of different forces leads to complex instability behaviors.
  • The study provides insights into the conditions driving interfacial instabilities in layered fluids.