Convective Heat Transfer from Small Cylinders in Water at Low Reynolds Numbers.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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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
- Fluid Mechanics