Accession Number:

AD0275772

Title:

THE LOCAL HEAT TRANSFER COEFFICIENT AROUND A HEATED HORIZONTAL CYLINDER IN AN INTENSE SOUND FIELD

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s):

• FAND,R.M.
• ROOS,J.

Report Date:

1961-12-01

Pagination or Media Count:

25.0

Abstract:

Idenifiers Thermoacoustic streaming. The local heat-transfer coefficient around the circumference of a heated horizontal cylinder, both in the presence and absence of a strong stationary sound field, was studied. Superposition of intense sound upon the free-convection temperature-velocity field about a heated horizontal cylinder increases the heat-transfer coefficient both on the under and upper portions of the cylinders surface. In the presence of a sound field for which SPL 146 db re 0.0002 microbar and f 1500 cps, the maximum measured increases in the local heat-transfer coefficient on the under and upper portions of a 34-inch diameter cylinder--relative to the free convection case at the same temperature potential-were approximately 250 and 1200 per cent, respectively. A comparison of these results with earlier flow-visualization studies indicates that the relatively large percentage increase in the heat-transfer coefficient on the upper portion of the cylinder is caused by the oscillating vortex flow which is characteristic of thermoacoustic streaming. Author

Descriptors:

• *HEAT TRANSFER
• *VIBRATION
• ACOUSTICS
• CONVECTION
• CYLINDRICAL BODIES
• THERMODYNAMICS

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE