Accession Number : AD0855119

Title :   Convective Heat Transfer from Small Cylinders in Water at Low Reynolds Numbers.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Achard, Robert T.

Report Date : JUN 1969

Pagination or Media Count : 73

Abstract : An experimental investigation was performed to investigate the applicability of using commercially available hot-film and hot-wire anemometer probes to measure water velocities below 3 fpm, and to determine the degree to which the probe sensors can be applied to quantitatively measure heat transfer. The probes were towed in a water trough at speeds between 0 and 3.5 fpm. Sensor diameter ranged from 0.15 to 6 mils and the range of Reynolds number was 0 to 3.5. The study indicated that 1 and 2 mil sensors were suitable for velocity measurement in water with 5% accuracy for speeds as low as 1 fpm. Experimental data for natural convection from horizontally and vertically oriented cylinders were developed which indicated end losses of 20% to 30% for hot-film sensors with length to diameter ratios of 20. Forced convection data conformed to a relationship recommended by Knudsen. (Author)

Descriptors :   (*HYDRODYNAMICS, HEAT TRANSFER), ANEMOMETERS, REYNOLDS NUMBER, DETECTORS, VELOCITY, FLOWMETERS, TOWED BODIES, ACCURACY, THESES, CYLINDRICAL BODIES.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE