Accession Number : AD0275772

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

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : FAND,R.M. ; ROOS,J.

Report Date : DEC 1961

Pagination or Media Count : 25

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 cylinder's 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 3/4-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

Distribution Statement : APPROVED FOR PUBLIC RELEASE