Abstract
Results of experimental investigations of the hydraulic resistance to a water flow in tubes with twisted ribbed strips are presented. Ribs were positioned discretely on the surface of these strips at an angle to their axis. The strips were turned through 180° with a relative twist of 2.5 and 4. The ribs had a height of 0.5–1.5 mm and were positioned with a step of 40–120 mm. The angle of positioning of ribs relative to the axis of a strip was varied from 40 to 50°. General relations for calculating the hydraulic-resistance coefficient of the indicated tubes at Re = 8000–100,000 have been obtained.
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