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Related Concept Videos

Steady, Laminar Flow Between Parallel Plates01:17

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Microlayered flow structure around an acoustically levitated droplet under a phase-change process.

Koji Hasegawa1, Yutaka Abe2, Atsushi Goda3

  • 1Department of Mechanical Engineering, Kogakuin University, Tokyo, Japan.

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Summary

Acoustic levitation reveals distinct evaporation stages and flow patterns in droplets. This study enhances understanding of volatile fluid behavior in acoustic levitators.

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Area of Science:

  • * Physics
  • * Fluid Dynamics
  • * Physical Chemistry

Background:

  • * Acoustic levitation method (ALM) is widely used in materials science, analytical chemistry, and biomedicine.
  • * Understanding droplet behavior under acoustic levitation is crucial for various applications.

Purpose of the Study:

  • * To experimentally investigate the flow field and evaporation process of levitated droplets.
  • * To examine the effect of saturated vapor pressure on droplet dynamics.
  • * To analyze the behavior of pure and binary mixture droplets.

Main Methods:

  • * Utilized a 19.4-kHz single-axis acoustic levitator.
  • * Employed a high-speed camera for observation.
  • * Tested water, ethanol, water/ethanol mixtures, and hexane as samples.

Main Results:

  • * Microlayered toroidal vortexes were observed for ethanol, certain water/ethanol mixtures, and hexane droplets.
  • * Two distinct evaporation stages were identified for ethanol and binary mixture droplets with >10% ethanol content.
  • * Clear visualization of internal and external flow fields in acoustically levitated droplets was achieved.
  • * Demonstrated the interaction between internal/external flow fields and volatile concentration in binary mixtures.

Conclusions:

  • * Findings provide insights into the complex interplay of flow fields and evaporation in levitated droplets.
  • * The study contributes to the advancement of theoretical predictions for acoustic levitation phenomena.
  • * Results are valuable for optimizing applications involving acoustic levitation of volatile liquids.