Internal-film-cooling experiments with 2- and 4-inch smooth-surface tubes and gas temperatures to 2000 F

George R. Kinney
naca-rm-e52b20
Apr 1952


An investigation of liquid-film cooling was conducted in 2- and 4-inch diameter straight tubes having honed inner surfaces with air flows at temperatures from 800 to 2000 degrees F and diameter Reynolds numbers from 220,000 to 1,100,000. The film coolant, water, was injected at a single axial position on the tube at flow rates from 0.02 to 0.24 pound per second per foot of tube circumference (0.8 to 12 percent of the air flow).

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