Results of experimental investigation into the hydraulic resistance to the air flow in pipes with cut metric triangular, rectangular, and round threads have been presented. The height of the thread profile varied from 0.25 to 1.25 mm. Conditions have been identified for the occurrence of a regime with full manifestation of roughness when the hydraulic resistance coefficient is independent of the Reynolds number. It has been established that the highest resistance is demonstrated by pipes with a rectangular thread. Generalizing relations have been obtained for calculating the dependence of the hydraulic resistance coefficient of the pipes on the relative roughness of their surface \( \overline{\Delta} \) (0.008–0.055) and the Reynolds number (6000–250,000).
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 93, No. 3, pp. 748–754, May–June, 2020.
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Zlobin, A.V., Tarasevich, S.É. Hydraulic Resistance of Pipes with Uniform Continuous Roughness of Varying Profile. J Eng Phys Thermophy 93, 725–732 (2020). https://doi.org/10.1007/s10891-020-02172-x
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DOI: https://doi.org/10.1007/s10891-020-02172-x