Nonlinear Heat Transfer From Particles in Supercritical Carbon Dioxide Near the Critical Point: Article No. TSEA-19-1228

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Abstract

Particle to fluid heat transfer in supercritical carbon dioxide (sCO2) is encountered in energy technologies and in materials synthesis. Near the critical point, the extreme pressure and temperature sensitivity of sCO2’s thermal conductivity will change the expected heat transfer in these systems. The current work combines the Kirchoff transformation for thermal conductivity with the conduction shape factor for a sphere, allowing prediction of heat transfer in these systems and quantification of the impact of these property changes. Results show that the heat transfer is non-linear for supercritical heat transfer, with the non-linearity particularly significant near the critical point. The results also show that approaches such as an average thermal conductivity based on film temperature are unlikely to accurately predict heat transfer in this region. The methods described in this paper can be applied to fluid–particle heat transfer at low Reynolds number in other fluids with large variations in thermal conductivity.
Original languageAmerican English
Number of pages5
JournalJournal of Thermal Science and Engineering Applications
Volume12
Issue number3
DOIs
StatePublished - 2020

NREL Publication Number

  • NREL/JA-2C00-73851

Keywords

  • bubbles
  • combustion and reactive flows
  • heat transfer in manufacturing
  • particles and droplets
  • thermophysical properties
  • two-phase flow and heat transfer
  • very high-temperature heat transfer

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