Heat-transfer enhancement in natural convection enclosure flow
The enhancement of natural convection heat transfer in an enclosure was studied experimentally in a water-filled test cell at Rayleigh numbers of theta(10/sup 10/). Surface average heat transfer, local heat transfer, and flow visualization were compared for a smooth and rough vertical heated wall. The facing cooled wall was smooth. The roughness was distributed over the entire heated wall and was of a height comparable to the velocity boundary layer thickness. Results indicate that the roughness promotes boundary layer transition giving fully turbulent behavior at overall Rayleigh numbers about half that for the smooth wall. Local increases in heat transfer of about 40% and surface averaged heat transfer increases of about 16% were observed.
- Research Organization:
- Solar Energy Research Inst., Golden, CO (USA)
- DOE Contract Number:
- AC02-83CH10093
- OSTI ID:
- 6480292
- Report Number(s):
- SERI/TR-252-2103; ON: DE84013048
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
140901* -- Solar Thermal Utilization-- Space Heating & Cooling
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320100 -- Energy Conservation
Consumption
& Utilization-- Buildings
BOUNDARY LAYERS
BUILDINGS
CONVECTION
DIMENSIONS
ENERGY SYSTEMS
ENERGY TRANSFER
EQUIPMENT
FLUID FLOW
HEAT TRANSFER
HEATING SYSTEMS
LAMINAR FLOW
LAYERS
MASS TRANSFER
NATURAL CONVECTION
PASSIVE SOLAR HEATING SYSTEMS
ROUGHNESS
SOLAR EQUIPMENT
SOLAR HEATING SYSTEMS
SURFACE PROPERTIES
THICKNESS
TURBULENT FLOW
WALLS
140901* -- Solar Thermal Utilization-- Space Heating & Cooling
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320100 -- Energy Conservation
Consumption
& Utilization-- Buildings
BOUNDARY LAYERS
BUILDINGS
CONVECTION
DIMENSIONS
ENERGY SYSTEMS
ENERGY TRANSFER
EQUIPMENT
FLUID FLOW
HEAT TRANSFER
HEATING SYSTEMS
LAMINAR FLOW
LAYERS
MASS TRANSFER
NATURAL CONVECTION
PASSIVE SOLAR HEATING SYSTEMS
ROUGHNESS
SOLAR EQUIPMENT
SOLAR HEATING SYSTEMS
SURFACE PROPERTIES
THICKNESS
TURBULENT FLOW
WALLS