MEASUREMENTS OF HEAT TRANSFER AND FRICTION COEFFICIENTS FOR HELIUM FLOWING IN A TUBE AT SURFACE TEMPERATURES UP TO 5900 R

Measurements of average heat-transfer and friction coefficients and local heat-transfer coefficients were made with helium flowing through electrically heated smooth tubes with length-diameter ratios of 60 and 92 for the following range of conditions: average surface temperature from 1475 to 4533 deg R, Reynolds number from 3230 to 60,000, heat flux up to 345,000 Btu per hour per square foot of heat-transfer area, and exit Mach number to 1.0. In general, the data of this investigation correlated with air data at lower temperatures obtained in previous investigations. (auth)