Enhancement of saturated nucleate pool boiling heat transfer by ultrasonic vibrations

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Heat Transfer - Japanese Research; (United States)

OSTI ID:7109602

Nakayama, A; Kano, M ^[1]

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1. 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), Journal Name: Heat Transfer - Japanese Research; (United States) Vol. 20:5; ISSN HTJPA; ISSN 0096-0802
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
ACOUSTIC TESTING
BOILING
BOILING DETECTION
DATA
DETECTION
ENERGY TRANSFER
EXPERIMENTAL DATA
FLOW VISUALIZATION
FLUID MECHANICS
FLUIDS
HEAT TRANSFER
HYDROGEN COMPOUNDS
INFORMATION
MATERIALS TESTING
MECHANICS
NONDESTRUCTIVE TESTING
NUMERICAL DATA
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOTOGRAPHY
POOL BOILING
REACTIVITY COEFFICIENTS
TEMPERATURE COEFFICIENT
TESTING
ULTRASONIC TESTING
WATER
WORKING FLUIDS