Effects of surface tension and contact angle on sensible heating and boiling incipience in dielectric falling films
Conference
·
OSTI ID:7002837
Predicting the point of incipient boiling is of paramount importance for reliable operation of liquid-cooled microelectronic heat sources during power transients. This study focuses on heat transfer from a simulated multichip module to a falling film. Experiments have been performed to develop an understanding of the influence of surface tension and wetting characteristics in sensible heat transfer and boiling incipience in free-falling dielectric (FC-72) liquid films. A correlation for the space-average heat transfer coefficient is presented which shows clear departure of FC-72 data from correlations obtained for fluids with higher surface tension. The boiling results reveal that the vanishingly small contact angle of FC-72 precluded the application of correlations currently employed to predict incipience. Also, the temperature overshoot commonly encountered upon boiling incipience in wetting fluids was nonexistent in all the experimental runs. 14 refs., 12 figs.
- Research Organization:
- Purdue Univ., Lafayette, IN (USA). Boiling and Two-Phase Flow Lab.
- DOE Contract Number:
- FG02-85ER13398
- OSTI ID:
- 7002837
- Report Number(s):
- DOE/ER/13398-9; CONF-880744-1; ON: DE88007057
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BOILING
COOLING SYSTEMS
CORRELATIONS
DIELECTRIC MATERIALS
ELECTRONIC EQUIPMENT
ENERGY SYSTEMS
ENERGY TRANSFER
EQUIPMENT
FILM BOILING
FILMS
HEAT FLUX
HEAT TRANSFER
MATERIALS
PHASE TRANSFORMATIONS
SURFACE PROPERTIES
SURFACE TENSION
TEMPERATURE DEPENDENCE
THIN FILMS
420400* -- Engineering-- Heat Transfer & Fluid Flow
BOILING
COOLING SYSTEMS
CORRELATIONS
DIELECTRIC MATERIALS
ELECTRONIC EQUIPMENT
ENERGY SYSTEMS
ENERGY TRANSFER
EQUIPMENT
FILM BOILING
FILMS
HEAT FLUX
HEAT TRANSFER
MATERIALS
PHASE TRANSFORMATIONS
SURFACE PROPERTIES
SURFACE TENSION
TEMPERATURE DEPENDENCE
THIN FILMS