Advances in the Unsteady Dynamics of Secondary Flow in 90° Pipe Bends
Received date: 2025-02-20
Revised date: 2025-04-21
Online published: 2025-06-17
Turbulent pipe flows with 90 degrees bends are widely used in industrial applications. Experimental studies have shown that unsteady oscillation of the Dean vortices in turbulent bend pipe flows could lead to harmful thermal and mechanical fatigue in pipeline systems. Majority of early research only focused on the static hydraulic characteristics of this type of flow. Few studied the unsteady dynamics of the instantaneous secondary flow field. The so-called swirl switching phenomenon in turbulent pipe flow with 90 degrees bend has attracted much attention in recent years. The aim of this work is to compare, analyse and discuss on previous investigation of swirl switching, in terms of upstream turbulence, flow separation, flow structures, switching frequency, flow control, etc. It is shown that the dynamic characteristics and spatio-temporal behaviour of this phenomenon remain ambiguous. It is proposed that high resolution three-dimensional flow field data are needed to help fully understand this type of flow.
WANG Zhi-xin , HAN Song-lin , JIANG Zhi-bing . Advances in the Unsteady Dynamics of Secondary Flow in 90° Pipe Bends[J]. Journal of Changjiang River Scientific Research Institute, 2025 : 0 . DOI: 10.11988/ckyyb.20250110
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