Accession Number:

AD0266568

Title:

MEASUREMENT OF HEAT TRANSFER FROM A CIRCULAR CYLINDER TO AN AXIAL STREAM WITH AIR INJECTION INTO A TURBULENT BOUNDARY LAYER

Descriptive Note:

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS HEAT TRANSFER LAB

Report Date:

1961-08-01

Pagination or Media Count:

1.0

Abstract:

A two-inch O.D. circular cylinder with porous walls fabricated out of a stainless steel woven wire mesh was aligned with its axis parallel toA LOW SPEED AIR STREAM. Secondary air was injected through the cylinder walls into the boundary layer at a uniform mass rate per unit area of outside cylinder surface in the range 0.00028 to .00290 of the free stream mass velocity. The boundary layer was turbulent. The heat transfer distribution along the cylinder was measured and is presented as a functional relationship between local Stanton number and Reynolds number with the injection rate as a parameter. Up to about one half reduction in heat transfer compared with zero injection resulted. A macroscopic energy balance at one injection rate was made on three portions of the model by appropriate boundary layer velocity and temperature surveys. Its results provided a satisfactory check on the heat transfer measurements. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE