Pressurized Carbon Dioxide as Heat Transfer Fluid: In uence of Radiation on Turbulent Flow Characteristics in Pipe

Caliot Cyril; Flamant Gilles; Caliot Cyril; Flamant Gilles

doi:10.3934/energy.2014.2.172

AIMS Energy

2014, Volume 1, Issue 2: 172-182. doi: 10.3934/energy.2014.2.172

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Pressurized Carbon Dioxide as Heat Transfer Fluid: In uence of Radiation on Turbulent Flow Characteristics in Pipe

Caliot Cyril ,
Flamant Gilles ^,

Processes, Materials, and Solar Energy Laboratory, PROMES-CNRS, Centre F. Trombe, 7 Rue du Four Solaire, 66120 Font-Romeu-Odeillo, France

Received: 16 January 2014 Accepted: 03 April 2014 Published: 30 April 2014

The influence of radiative heat transfer in a CO₂ pipe flow is numerically investigated at different pressures.Coupled heat and mass transfer, including radiation transport, are modeled. The physical models and the high temperature and high pressure radiative properties method of computation are presented. Simulations are conducted for pure CO₂ flows in a high temperature pipe at 1100 K (with radius 2 cm) with a fixed velocity (1 m·s^-1) and for di erent operating pressures, 0:1, 1, 5 and 20 MPa (supercritical CO₂). The coupling between the temperature and velocity fields is discussed and it is found that the in uence of radiation absorption is important at low pressure and as the operating pressure increases above 5 MPa the influence of radiation becomes weaker due to an increase of CO₂ optical thickness.
- Radiation transport, CO₂ radiative properties, high pressure carbondioxide spectra, computational fluid dynamics, supercritical carbon dioxide flow, radiation and flow coupling
Citation: Caliot Cyril, Flamant Gilles. Pressurized Carbon Dioxide as Heat Transfer Fluid: In uence of Radiation on Turbulent Flow Characteristics in Pipe[J]. AIMS Energy, 2014, 1(2): 172-182. doi: 10.3934/energy.2014.2.172

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Abstract

The influence of radiative heat transfer in a CO₂ pipe flow is numerically investigated at different pressures.Coupled heat and mass transfer, including radiation transport, are modeled. The physical models and the high temperature and high pressure radiative properties method of computation are presented. Simulations are conducted for pure CO₂ flows in a high temperature pipe at 1100 K (with radius 2 cm) with a fixed velocity (1 m·s^-1) and for di erent operating pressures, 0:1, 1, 5 and 20 MPa (supercritical CO₂). The coupling between the temperature and velocity fields is discussed and it is found that the in uence of radiation absorption is important at low pressure and as the operating pressure increases above 5 MPa the influence of radiation becomes weaker due to an increase of CO₂ optical thickness.

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