Heat transfer correlations for low Reynolds number flows of water in vertical annuli
This paper presents heat transfer correlations for both buoyancy assisted and opposed laminar and transition flows of water in vertical annuli for Reynolds numbers ranging from 150 to 10/sup 4/ and Rayleigh numbers up to 10/sup 7/. The correlations are based on more than 800 data points collected for two annuli (diameter ratio of 1.17 and 2.0) with an isoflux inner wall and an adiabatic outer wall. Results demonstrated that the buoyancy assisted flow data could be divided into four regimes based on the values of Reynolds number: Laminar (Re < 800), Combined Laminar (800 < Re > 2100), Laminar/ Transition (2100 < Re < 5000), and Transition ( 5000 < Re 10,000). This data, except for transition flow, was correlated in terms of Gz to account for the effect on the Nusselt number of the axial distance from the bottom of the heated section. For buoyancy opposed flow, however, Richardson number more accurately classified the data. The data for this flow was correlated in three regions: Ri < 0.06, 0.06 < Ri < 0.47, and 0.47 < Ri < 3.0. The heat transfer correlations for both buoyancy assisted and opposed flows were within +-10 percent of the experimental data.
- OSTI ID:
- 5732213
- Report Number(s):
- CONF-861211-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420400* -- Engineering-- Heat Transfer & Fluid Flow
ADIABATIC PROCESSES
CORRELATIONS
DUCTS
ENERGY TRANSFER
FLUID FLOW
FLUID MECHANICS
HEAT FLUX
HEAT TRANSFER
HYDRODYNAMICS
HYDROGEN COMPOUNDS
INCLINATION
LAMINAR FLOW
LIQUID FLOW
MECHANICS
NUSSELT NUMBER
OXYGEN COMPOUNDS
REYNOLDS NUMBER
THERMODYNAMICS
TURBULENT FLOW
WATER