Liquid-solid contact measurements using a surface thermocouple temperature probe in atmospheric pool boiling water

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6776556

Lee, L Y.W.; Chen, J C; Nelson, R A

Objective was to apply the technique of using a microthermocouple flush-mounted at the boiling surface for the measurement of the local-surface-temperature history in film and transition boiling on high temperature surfaces. From this measurement direct liquid-solid contact in film and transition boiling regimes was observed. In pool boiling of saturated, distilled, deionized water on an aluminum-coated copper surface, the time-averaged, local-liquid-contact fraction increased with decreasing surface superheat. Average contact duration increased monotonically with decreasing surface superheat, while frequency of liquid contact reached a maximum of approx. 50 contacts/s at a surface superheat of approx. 100 K and decreased gradually to 30 contacts/s near the critical heat flux. The liquid-solid contact duration distribution was dominated by short contacts < 4 ms for high surface superheats and shifted to long contacts > 4 ms at low surface superheats, passing through a relatively flat contact duration distribution at about 80/sup 0/K. Results of this paper indicate that liquid-solid contacts may be the dominant mechanism for energy transfer in the transition boiling process.

• Research Organization: Lehigh Univ., Bethlehem, PA (USA). Inst. of Thermo-Fluid Engineering and Science; EG and G Idaho, Inc., Idaho Falls (USA)
• DOE Contract Number: AC07-76ID01570
• OSTI ID: 6776556
• Report Number(s): EGG-M-08084; CONF-840816-17; ON: DE84017238
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
42 ENGINEERING
420400 -- Engineering-- Heat Transfer &amp; Fluid Flow
BOILING
CRITICAL HEAT FLUX
ENERGY TRANSFER
FILM BOILING
HEAT FLUX
HEAT TRANSFER
HEATING
HYDROGEN COMPOUNDS
MEASURING INSTRUMENTS
MEASURING METHODS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POOL BOILING
SUPERHEATING
SURFACES
THERMOCOUPLES
TRANSITION BOILING
WATER