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Test Case 1 : Mixed convection in vertically flowing heated pipe (buoyancy aiding or opposing)

KNOO CFD @ Manchester: Heat transfer test cases. Test Case 1 : Mixed convection in vertically flowing heated pipe (buoyancy aiding or opposing). Problem specifications: Re=2650 Pr=0.71 Wall constant heat flux Boussinesq approximation Heat transfer Regimes:

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Test Case 1 : Mixed convection in vertically flowing heated pipe (buoyancy aiding or opposing)

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  1. KNOO CFD @ Manchester: Heat transfer test cases Test Case 1 :Mixed convection in vertically flowing heated pipe(buoyancy aiding or opposing) • Problem specifications: • Re=2650 • Pr=0.71 • Wall constant heat flux • Boussinesq approximation Heat transfer Regimes: • Gr/Re2=0.000  Forced Convection • Gr/Re2=0.063  Forced/Mixed Convection • Gr/Re2=0.087  Re-Laminarization • Gr/Re2=0.241  Recovery

  2. Relevance to AGR and VHTR AGR working scheme

  3. Buoyancy aiding or opposing vertical pipe flow V gradient nearer wall => Turbulence decrease buoyancy opposing buoyancy aiding V gradient away from wall => Turbulence increase

  4. Nu/Nu0 against ‘buoyancy parameter’, [Hall and Jackson ]

  5. STAR-CD Quasi DNS [Y. Addad ]

  6. K-omega not sensitive to buoyancy effect

  7. Good predictions by V2F models

  8. “standard” STAR k-epsilon model (Lien Chen Leschziner)

  9. Expt. of Polyakov & Shindin Results for Fully-Developed ForcedConvection. (no buoyancy)

  10. Buoyancy aided heated pipe flow Gr/Re**2 = 0.000

  11. Buoyancy aided heated pipe flow Gr/Re**2 = 0.087 (relaminarization)

  12. Buoyancy aided heated pipe flow Gr/Re**2 = 0.087 (relaminarization)

  13. Buoyancy aided heated pipe flow Gr/Re**2 = 0.087 (relaminarization)

  14. Buoyancy aided heated pipe flow Gr/Re**2 = 0.241 (recovery)

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