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# Test Case 1 : Mixed convection in vertically flowing heated pipe (buoyancy aiding or opposing) - PowerPoint PPT Presentation

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)

• 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

AGR working scheme

=> Turbulence decrease

buoyancy opposing

buoyancy aiding

=> Turbulence increase

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

Results for Fully-Developed ForcedConvection. (no buoyancy)

Gr/Re**2 = 0.000

Gr/Re**2 = 0.087 (relaminarization)

Gr/Re**2 = 0.087 (relaminarization)

Gr/Re**2 = 0.087 (relaminarization)

Gr/Re**2 = 0.241 (recovery)