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EFFECTS OF ASYMMETRICAL CORRUGATION ON FLOW FIELD AND HEAT TRANSFER EFFICIENCY IN CORRUGATED TUBE

卷 14, 册 1, 2022, pp. 31-43
DOI: 10.1615/ComputThermalScien.2021039417
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摘要

In the present study, the numerical investigation is carried out by using Fluent 15.0 software to analyze the difference between symmetrical corrugation and asymmetrical corrugation on the flow field and the heat transfer efficiency of a corrugated tube in the Reynolds number range of 5000 to 40,000. Additionally, the effects of asymmetrical corrugation depth H and small corrugation radii R on flow field and heat transfer efficiency are discussed. The distributions of streamline, turbulence kinetic energy, and turbulent viscosity are analyzed to reveal the mechanism of flow and heat transfer. The results show that the distribution of small corrugation is the key factor determining the heat transfer efficiency of asymmetrical corrugation (ACT). Compared with symmetrical corrugation (SCT), the heat transfer efficiency of ACTR is significantly enhanced, while the heat transfer efficiency of ACTL is poor. Furthermore, the thermal-hydraulic performance (THP) of ACTR is enhanced as H increases or R decreases. The research provides a reference for the parameters optimization of ACT.

Figures

  • Structure diagram of outward convex corrugated tube
  • Grids diagram of corrugated tube
  • Verification of simulation data: (a) smooth tube; (b) corrugated tube
  • Flow field characteristics of ACTR on different cross section
  • The tangential velocity distribution of ACTR on different Z cross section
  • Turbulent properties of ACTR on the X = 0 cross section
  • Temperature contour of smooth tube and ACTR on the X = 0 cross section
  • Effects of corrugation parameters on Nu/Nu0, f/f0, and THP: (a) effect of corrugation type; (b) effect of corrugation
depth; (c) effect of small corrugation radii
  • Comparison of flow field characteristics of SCT, ACTL, and ACTR
  • Comparison of turbulent properties of SCT, ACTR, and ACTL
  • Comparison of flow field characteristics of ACTR with different H
  • Effects of H on turbulent viscosity
  • Comparison of flow field characteristics of ACTR with different R
  • Effects of R on turbulent properties
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