Improved modelling of turbulent forced convective heat transfer in straight ducts

Conference · Tue Jul 01 04:00:00 EDT 1997

OSTI ID:20014371

Rokni, M; Sunden, B

Ducts with non-circular cross sections are frequently encountered in industrial heat transfer equipment, e.g., compact heat exchangers, cooling channels in gas turbine blades, nuclear reactors, etc. This investigation concerns numerical calculation of turbulent forced convective heat transfer and fluid flow in their fully developed state at low Reynolds number. The authors have developed a low Reynolds number version of the non-linear {kappa}-{epsilon} model combined with the heat flux models of SED, low Reynolds number version of GGDH and WET in general three dimensional geometries. The wall function approach is abandoned and the friction factor is predicted in agreement with experiments. The Nusselt numbers are also predicted very well. Fully developed condition is achieved by imposing cyclic boundary conditions in the main flow direction. The numerical approach is based on the finite volume technique with a non-staggered grid arrangement and the SIMPLEC algorithm. Results have been obtained with the linear and the nonlinear {kappa}-{epsilon} model, combined with the Lam-Bremhorst damping functions for low Reynolds numbers. The secondary flow patterns are also of major concern.

• Research Organization: Lund Inst. of Tech. (SE)
• OSTI ID: 20014371
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
BOUNDARY CONDITIONS
DUCTS
FLOW MODELS
FORCED CONVECTION
NUMERICAL ANALYSIS
NUSSELT NUMBER
REYNOLDS NUMBER
THEORETICAL DATA
TURBULENT FLOW