Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleExperimental study of the pumping action of helical flow.AuthorsPetrichenko, M. R.; Khar'kov, N. S.AbstractA decrease in hydraulic friction coefficient Σ (Darcy number) is found in the range of smooth tubes. The maximum possible decrease in Σ is observed at Φ = 0.08 for numbers Re D = V x D / ν in the range Re Dx = (5.8−6.6) × 104.SubjectsHYDRAULIC engineering; HELICAL springs; TUBES; PUMPING machinery; PHYSICSPublicationTechnical Physics, 2009, Vol 54, Issue 7, p1063ISSN1063-7842Publication typeArticleDOI10.1134/S1063784209070238