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Related Concept Videos

Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Physical Properties Affecting Solubility

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As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...

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Fabrication of the Thermoplastic Microfluidic Channels
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Published on: February 3, 2008

CO(2) dissolution in water using long serpentine microchannels.

Thomas Cubaud1, Martin Sauzade, Ruopeng Sun

  • 1Department of Mechanical Engineering, Stony Brook University, Stony Brook, New York 11794, USA.

Biomicrofluidics
|June 2, 2012
PubMed
Summary
This summary is machine-generated.

This study investigates carbon dioxide bubble dissolution in water within microchannels, revealing three distinct flow regimes. Bubble size and velocity are empirically linked, impacting dissolution efficiency in coalescing flows.

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Area of Science:

  • Fluid dynamics
  • Multiphase flow
  • Mass transfer

Background:

  • Bubble dynamics in confined geometries are crucial for processes like gas dissolution.
  • Understanding gas-liquid interactions in microchannels is key for microfluidic applications.
  • Previous studies often lack detailed analysis of bubble evolution over long distances.

Purpose of the Study:

  • To experimentally investigate the dissolution of carbon dioxide bubbles in water within long microchannels.
  • To analyze the coupling between bubble hydrodynamics and dissolution in confined geometries.
  • To identify and characterize different flow regimes based on initial liquid fraction.

Main Methods:

  • Utilizing long microchannels for controlled experimental observation.
  • Tracking individual bubbles to measure their evolution over distance.
  • Calculating temporal changes in liquid volumetric fraction and local flow velocity.
  • Empirically establishing the relationship between bubble size and velocity.

Main Results:

  • Three distinct operating regimes identified: saturating, coalescing, and dissolving.
  • Observed morphological and dynamical transitions from segmented to dilute bubbly flows.
  • Established an empirical functional relationship between bubble size and velocity.
  • Demonstrated that this relationship limits dissolution efficiency in the coalescing regime.

Conclusions:

  • Bubble hydrodynamics and dissolution are intricately coupled in confined microchannels.
  • The identified flow regimes and bubble size-velocity relationship are critical for predicting dissolution efficiency.
  • Further research into optimizing coalescing flows could enhance microfluidic gas dissolution processes.