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The flow and heat transfer characteristics of supercritical mixed-phase CO2 and N2 in a 3D self-affine rough fracture

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Listed:
  • Zhang, Jiansong
  • Liu, Yongsheng
  • Lv, Jianguo
  • Gao, Wenlong

Abstract

Utilizing a three-dimensional self-affine function, we constructed the fracture morphology and established a numerical model considering the thermal-hydraulic coupling (TH) mechanism to simulate the flow and heat transfer processes of CO2 and N2 in a single fracture under supercritical mixed-phase conditions in dry hot rock. The fractal dimension of the fracture was set to 2.5, and the Joint Roughness Coefficient (JRC) roughness coefficient was 13.71. The model accurately simulated the flow and heat transfer processes of supercritical mixed-phase CO2 and N2 fluids within the fracture under the conditions of 50 MPa underground pressure, 200 °C rock exterior temperature, initial temperature of 32 °C for the heat transfer fluid, and inlet velocities ranging from 0.005 to 0.03 m/s. The results revealed that the output thermal power curves for nine different ratios of CO2 and N2 could be classified into three categories.

Suggested Citation

  • Zhang, Jiansong & Liu, Yongsheng & Lv, Jianguo & Gao, Wenlong, 2024. "The flow and heat transfer characteristics of supercritical mixed-phase CO2 and N2 in a 3D self-affine rough fracture," Energy, Elsevier, vol. 303(C).
    • Handle: RePEc:eee:energy:v:303:y:2024:i:c:s0360544224017407
    DOI: 10.1016/j.energy.2024.131967
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    Keywords

    CO2 and N2 miscible flow; Fluids properties; Supercritical state; Hot dry rock; Coupled thermal-hydraulic;
    All these keywords.

    JEL classification:

    • N2 - Economic History - - Financial Markets and Institutions

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