Torsion effect on the flow in a helical pipe

Kyoji Yamamoto, Shinichiro Yanase, Takahiro Yoshida

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)


The effect of curvature and torsion on the flow in a helical pipe of circular cross-section is studied numerically by the spectral method. The calculations are carried out for 0 ≤ δ ≤ 0.6, 0 ≤ β0 ≤ 1.4 and 500 ≤ Dn≤ 2000, where δ is the non-dimensional curvature,β0 the ratio of torsion to square root of curvature, and Dn the Dean number. The results obtained indicate large effects of torsion on the flow: The conventional two-vortex secondary flow is distorted to become almost one single recirculating cell when β0 {greater-than or approximate} 0.8. The flux through the pipe at the given Dean number and curvature first decreases from that of the toroidally curved pipe as β0 increases from zero, reaches a minimum at β0 ≈ 0.8, and then increases to values larger than that of the toroidally curved pipe. The minimum value decreases as ° increases.

Original languageEnglish
Pages (from-to)259-273
Number of pages15
JournalFluid Dynamics Research
Issue number5
Publication statusPublished - Nov 1994

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes


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