Enhancement of saturated nucleate pool boiling heat transfer by ultrasonic vibrations
- Dept. of Mechanical Engineering, Kyushu Sangyo Univ. (JP)
This paper reports that the effect of ultrasonic vibrations on saturated nucleate pool boiling heat transfer either in the presence or in the absence of glass beads in distilled water was investigated under reduced pressure. A flat heated surface 20 mm in diameter was immersed in the saturated working fluid and exposed to ultrasonic energy of 140 W with a frequency of 20 kHz. The heat-transfer coefficient with glass beads in distilled water was larger than that without glass beads, and up to a fourfold increase in the heat-transfer coefficient was obtained. The heat-transfer coefficient increased with a decrease of system pressure, while it decreased with an increase of heat flux. Observations using 35-mm photographs elicited some considerations on possible mechanisms.
- OSTI ID:
- 7109602
- Journal Information:
- Heat Transfer - Japanese Research; (United States), Vol. 20:5; ISSN 0096-0802
- Country of Publication:
- United States
- Language:
- English
Similar Records
Nucleate pool boiling from a horizontal wire in viscoelastic fluids
Numerical modeling of the effect of surface topology on the saturated pool nucleate boiling curve
Related Subjects
WORKING FLUIDS
HEAT TRANSFER
POOL BOILING
TEMPERATURE COEFFICIENT
BOILING DETECTION
EXPERIMENTAL DATA
FLOW VISUALIZATION
FLUID MECHANICS
PHOTOGRAPHY
ULTRASONIC TESTING
WATER
ACOUSTIC TESTING
BOILING
DATA
DETECTION
ENERGY TRANSFER
FLUIDS
HYDROGEN COMPOUNDS
INFORMATION
MATERIALS TESTING
MECHANICS
NONDESTRUCTIVE TESTING
NUMERICAL DATA
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
REACTIVITY COEFFICIENTS
TESTING
420400* - Engineering- Heat Transfer & Fluid Flow