Back to Search Start Over

Effect of pitch and length of three-lobed helical pipe on swirl flow characteristics in pneumatic conveying pipeline.

Authors :
Zhou, Haili
Hu, Jiayuan
Wu, Kexin
Source :
Journal of Mechanical Science & Technology. Aug2024, Vol. 38 Issue 8, p4199-4208. 10p.
Publication Year :
2024

Abstract

A three-lobed helical pipe was installed downstream of the bend of a vertical-horizontal pneumatic pipeline. The swirl characteristics under different helical pipe structures were investigated. Results show that: (a) the maximum velocity region rotates quasiperiodically, and the smaller the pitch, the faster the rotation; (b) the 3D morphological changes of the axial velocity distribution in downstream sections are similar: from an arch to a pit and finally to a uniform flat top. The tangential velocity appears as a Rankine vortex near the wall; (c) the swirl decays rapidly along the downstream. The initial swirl intensity, proportional to the helical pipe length, increases first and then decreases with decreasing pitch, whereas the structural parameters have minimal effect on the swirl decay rate; (d) the helical tube remarkably increases the system energy consumption, and the total pressure drop is inversely proportional to the pitch and proportional to the length. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
1738494X
Volume :
38
Issue :
8
Database :
Academic Search Index
Journal :
Journal of Mechanical Science & Technology
Publication Type :
Academic Journal
Accession number :
178855215
Full Text :
https://doi.org/10.1007/s12206-024-0717-5