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In this study, dynamic mode decomposition (DMD) method is used to extract the important modes for the development of the transient boundary heat transfer flow field of supercritical carbon dioxide (sCO2) turbulent thermal convection. The snapshots of the sCO2 temperature field at two different time intervals of 3–10 s and 10–18 s from the experiments are subjected to DMD under two different supercritical conditions of pressure of 7.777 MPa, temperature of 305.4 K and pressure of 7.997 MPa, temperature of 305.47 K. The growth rates, frequencies corresponding to the decomposed modes, and the specific features of the mode diagrams of each order are extracted. The results show that DMD method can reveal the characteristics of the dynamic behavior of heat transfer, mainly heat diffusion and heat convection of sCO2 at two different stages of heat transfer and equilibrium.

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Dynamic Mode Decomposition Study of Transient Heat Transfer Behavior of Turbulent Boundary Layer in sCO2 Channel

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  • 发表日期：

    2025年

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  • Shiyang Li,
  • Gang Zeng,
  • Lin Chen

摘要

In this study, dynamic mode decomposition (DMD) method is used to extract the important modes for the development of the transient boundary heat transfer flow field of supercritical carbon dioxide (sCO2) turbulent thermal convection. The snapshots of the sCO2 temperature field at two different time intervals of 3–10 s and 10–18 s from the experiments are subjected to DMD under two different supercritical conditions of pressure of 7.777 MPa, temperature of 305.4 K and pressure of 7.997 MPa, temperature of 305.47 K. The growth rates, frequencies corresponding to the decomposed modes, and the specific features of the mode diagrams of each order are extracted. The results show that DMD method can reveal the characteristics of the dynamic behavior of heat transfer, mainly heat diffusion and heat convection of sCO2 at two different stages of heat transfer and equilibrium.