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Reference Correlation for the Viscosity of Carbon Dioxide.

Arno Laesecke1, Chris D Muzny1

  • 1National Institute of Standards and Technology, Material Measurement Laboratory, Applied Chemicals and Materials Division.

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Summary

A new correlation for carbon dioxide (CO2) viscosity was developed using experimental and computed data. This advanced model accurately predicts viscosity across a wide range of temperatures and pressures for gaseous, liquid, and supercritical states.

Keywords:
Carbon dioxideRainwater-Friend theorycritical enhancementdata analysisthermodynamic scalingthermophysical propertiesviscosity

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Area of Science:

  • Thermodynamics
  • Fluid Dynamics
  • Physical Chemistry

Background:

  • Accurate viscosity data for carbon dioxide (CO2) is crucial for various industrial and scientific applications.
  • Existing correlations have limitations in accuracy and range, necessitating an improved model.

Purpose of the Study:

  • To develop a comprehensive and accurate reference correlation for the viscosity of carbon dioxide (CO2).
  • To extend the predictive capabilities of CO2 viscosity across a broad range of temperatures and pressures.

Main Methods:

  • Compilation of a comprehensive database of experimental and computed viscosity data for CO2.
  • Development of a new correlation based on ab initio potential energy surfaces and guided symbolic regression.
  • Incorporation of Rainwater-Friend theory and a scaling term for residual viscosity.

Main Results:

  • A new viscosity correlation for CO2 was established, covering temperatures from 100 K to 2000 K (gaseous) and 220 K to 700 K (liquid/supercritical).
  • The correlation accurately represents data across extended pressure ranges up to 8000 MPa.
  • The new model demonstrates superior accuracy and a significantly wider operational range compared to previous correlations.

Conclusions:

  • The developed CO2 viscosity correlation provides a highly accurate and extended representation for diverse states.
  • This work offers a valuable tool for research and industrial processes involving carbon dioxide.