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- Title
Numerical Analysis on the Effect of Combined-Curve Tapered Segment on the Flow Field and Separation Performance of Hydrocyclones.
- Authors
Li, Feng; Liu, Peikun; Yang, Xinghua; Zhang, Yuekan; Li, Xiaoyu; Jiang, Lanyue; Wang, Hui; Fu, Wenxiu
- Abstract
Tapered segment, the main separation region in a hydrocyclone, is mainly used to cut off the short-circuit flow. Generally, a single straight-line tapered segment is set in a conventional hydrocyclone, the effects of multi-curved-line combination-type tapered segment on the flow field in the hydrocyclone and the related separation performance have been poorly investigated. In this study, five different types of hydrocyclones with different tapered-segment structures (straight line, parabolic curve, hyperbolic curve, the combination of parabolic curve and straight line and the combination of hyperbolic curve and straight line), denoted as Type A, Type B, Type C, Type D and Type E hydrocyclones, respectively) were selected for numerical analysis. The simulation data were compared with classical experimental values by Hsieh et al. to validate the accuracy. Moreover, the changes of pressure fields, velocity fields, air columns, turbulence intensities and separation efficiencies in five different hydrocyclones were investigated in depth. The results showed that both the pressure drop and the tangential velocities of Type C and Type E hydrocyclones were higher than that of Type A hydrocyclone, while the pressure drop of Type B and Type D hydrocyclones was lower than that of Type A hydrocyclone. Under a higher pressure, fine particles moved toward the center more easily, thereby leading to the decreasing number of dislocated particles. Compared with conventional straight-line tapered segment, the combination-type tapered segment exhibited smaller axial velocity, which prolonged the retention time of particles in the hydrocyclone and contributed to full particle separation. The turbulence intensity can be weakened by changing the tapered-segment structure. The turbulence intensity in Type D hydrocyclone was lowest among the five hydrocyclones. In addition, the separation performance of hydrocyclones can also be enhanced by changing the structural form of the tapered segment. Type B hydrocyclone was featured by favorable separation performance and Type D hydrocyclone exhibited a small cutting size.
- Subjects
MACHINE separators; NUMERICAL analysis; PRESSURE drop (Fluid dynamics); PARTICULATE matter; RF values (Chromatography); FLOW separation
- Publication
Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ), 2022, Vol 47, Issue 5, p6193
- ISSN
2193-567X
- Publication type
Article
- DOI
10.1007/s13369-021-06072-x