Enhanced convective and film boiling heat transfer by surface gas injection [electronic resource].
- Published:
- Washington, D.C. : United States. Dept. of Energy, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description:
- Pages: (107 pages) : digital, PDF file
- Additional Creators:
- Brookhaven National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Summary:
- Heat transfer measurements were made for stable film boiling of water over a horizontal, flat stainless steel plate from the minimum film boiling point temperature, T{sub SURFACE} ∼500K, to T{sub SURFACE} ∼950K. The pressure at the plate was approximately 1 atmosphere and the temperature of the water pool was maintained at saturation. The data were compared to the Berenson film-boiling model, which was developed for minimum film-boiling-point conditions. The model accurately represented the data near the minimum film-boiling point and at the highest temperatures measured, as long it was corrected for the heat transferred by radiation. On the average, the experimental data lay within {plus minus}7% of the model. Measurements of heat transfer were made without film boiling for nitrogen jetting into an overlying pool of water from nine 1-mm- diameter holes, drilled in the heat transfer plate. The heat flux was maintained constant at approximately 26.4 kW/m². For water-pool heights of less than 6cm the heat transfer coefficient deceased linearly with a decrease in heights. Above 6cm the heat transfer coefficient was unaffected. For the entire range of gas velocities measured (0 to 8.5 cm/s), the magnitude of the magnitude of the heat transfer coefficient only changed by approximately 20%. The heat transfer data bound the Konsetov model for turbulent pool heat transfer which was developed for vertical heat transfer surfaces. This agreement suggests that surface orientation may not be important when the gas jets do not locally affect the surface heat transfer. Finally, a database was developed for heat transfer from the plate with both film boiling and gas jetting occurring simultaneously, in a pool of water maintained at its saturation temperature. The effect of passing nitrogen through established film boiling is to increase the heat transfer from that surface. 60 refs.
- Report Numbers:
- E 1.99:bnl-52326
bnl-52326 - Subject(s):
- Other Subject(s):
- Film Boiling
- Mathematical Models
- Water Cooled Reactors
- Heat Transfer
- Bubbles
- Convection
- Hydraulics
- Jets
- Nitrogen
- Pool Boiling
- Reactor Safety
- Stainless Steels
- Surfaces
- Temperature Range 0400-1000 K.
- Water
- Alloys
- Boiling
- Elements
- Energy Transfer
- Fluid Mechanics
- High Alloy Steels
- Hydrogen Compounds
- Iron Alloys
- Iron Base Alloys
- Mass Transfer
- Mechanics
- Nonmetals
- Oxygen Compounds
- Phase Transformations
- Reactors
- Safety
- Steels
- Temperature Range
- Note:
- Published through SciTech Connect.
04/01/1992.
"bnl-52326"
"DE92016755"
Greene, G.A.; Irvine, T.F., Jr. . Dept. of Mechanical; Duignan, M.R. - Funding Information:
- AC02-76CH00016
View MARC record | catkey: 14117100