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Condensation in One-Dimensional Dead-End Nanochannels.

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Summary

Condensation in nanoscale channels, like those in shale, shows distinct mechanisms and is primarily limited by vapor flow resistance. These findings differ significantly from larger-scale phase change behaviors.

Keywords:
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Area of Science:

  • Nanoscale science
  • Chemical engineering
  • Geophysics

Background:

  • Phase change phenomena are crucial in biological and geological processes.
  • Unconventional oil and gas extraction from nanoporous shale requires understanding nanoscale phase behavior.

Purpose of the Study:

  • To directly observe and analyze condensation and condensate growth of propane in sub-100 nm channels.
  • To differentiate condensation mechanisms at the nanoscale.
  • To investigate the factors limiting condensation growth rates in confined spaces.

Main Methods:

  • Direct observation of propane condensation in discrete sub-100 nm channels.
  • Analysis of condensation mechanisms: continuous growth and discontinuous growth (liquid bridging).
  • Comparison of growth rates with a thermofluid resistance model.

Main Results:

  • Two distinct nanoscale condensation mechanisms (continuous and discontinuous growth) were observed, yielding similar net growth rates.
  • Condensate growth rates in sub-100 nm channels align with predictions from a thermofluid resistance model.
  • Vapor flow resistance (approx. 70%) dominates over interface resistance in sub-100 nm channels, unlike larger scales.
  • Condensation-induced vapor flow occurs in the transitional flow regime, with Knudsen flow contributing up to 13%.

Conclusions:

  • Nanoscale confinement (sub-100 nm) significantly alters condensation conditions compared to microscale and bulk conditions.
  • Vapor flow and interface resistances are the primary factors causing deviations in condensation behavior at the sub-100 nm scale.
  • Findings are relevant for understanding phase behavior in nanoporous shale and other confined systems.