Convective heat transfer near the entrance region of a tube for water near the critical point
Numerical modeling is carried out to investigate the characteristics of convective heat transfer for the turbulent developing flow of water near the critical point in a tube with or without buoyancy force for constant wall temperature. The modeling includes the effects of the thermodynamic and transport property variations. The effects of proximity to the critical point and wall temperature variation on the buoyancy force are considered as well as varying properties near the pseudocritical temperature. For turbulent diffusivity, a modified mixing length model including density fluctuation is used. Emphasis is on effects very close to the inlet (z/D < 10). The results show heat transfer and fluid flow characteristics which include velocity profiles, heat transfer coefficient and friction factor distribution along the tube. Effects of gravity force on turbulent eddy viscosity distribution inside the tube are also studied. Results using several models for turbulent Prandtl number are compared.
- Research Organization:
- Univ. of Texas, Austin, TX (US)
- OSTI ID:
- 20014386
- Resource Relation:
- Conference: 32nd National Heat Transfer Conference, Baltimore, MD (US), 08/08/1997--08/12/1997; Other Information: PBD: 1997; Related Information: In: ASME proceedings of the 32nd national heat transfer conference (HTD-Vol. 350). Volume 12: Fundamental experiment techniques in heat transfer; Thermal hydraulics of advanced nuclear reactors; Heat and mass transfer in supercritical liquid systems; Heat transfer in energy conversion; Heat transfer equipment; Heat transfer in gas turbine systems, by Beasley, D.E.; Hassan, Y.A.; Cheung, F.B.; Yang, B.; Presser, C.; Olsen, D.A.; Tong, W.; Phelan, P.; Swanson, L.W.; McEligot, D.W.; Bogard, D.G. [eds.], 261 pages.
- Country of Publication:
- United States
- Language:
- English
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