Global mode analysis of a pipe flow through a 1:2 axisymmetric sudden expansion

2010 ◽  
Vol 22 (7) ◽  
pp. 071702 ◽  
Author(s):  
E. Sanmiguel-Rojas ◽  
C. del Pino ◽  
C. Gutiérrez-Montes
Keyword(s):  
Pipe Flow ◽  
Mode Analysis ◽  
Sudden Expansion ◽  
Global Mode ◽  
Flow Through

Biphasic co-flow through a sudden expansion or contraction of a Hele-Shaw channel

2021 ◽  
Vol 6 (7) ◽  
Author(s):  
Boris Y. Rubinstein ◽  
Dana Zusmanovich ◽  
Zhenzhen Li ◽  
Alexander M. Leshansky
Keyword(s):  
Sudden Expansion ◽  
Flow Through

Bifurcation analysis of two-dimensional laminar flow through sudden expansion channel

2022 ◽  
Vol 13 (1) ◽  
pp. 0-0
Keyword(s):  
Laminar Flow ◽  
Expansion Ratio ◽  
Sudden Expansion ◽  
Two Dimensional ◽  
Governing Equations ◽  
Bifurcation Phenomena ◽  
Different Types ◽  
Fluent Software ◽  
Flow Through ◽  
Volume Method

In this work, bifurcation characteristics of unsteady, viscous, Newtonian laminar flow in two-dimensional sudden expansion and sudden contraction-expansion channels have been studied for different values of expansion ratio. The governing equations have been solved using finite volume method and FLUENT software has been employed to visualize the simulation results. Three different mesh studies have been performed to calculate critical Reynolds number (Recr) for different types of bifurcation phenomena. It is found that Recr decreases with the increase in expansion ratio (ER).

On the effect of a sharp bend in a fully developed turbulent pipe-flow

1968 ◽  
Vol 34 (3) ◽  
pp. 595-608 ◽  
Author(s):  
M. J. Tunstall ◽  
J. K. Harvey
Keyword(s):  
Secondary Flow ◽  
Pipe Flow ◽  
Secondary Circulation ◽  
Turbulent Pipe Flow ◽  
Sharp Bend ◽  
Random Frequency ◽  
Angle Bend ◽  
Circulatory Flow ◽  
Flow Through ◽  
Upstream Flow

It has been found experimentally that the turbulent pipe flow through a mitred, right-angle bend produces a downstream secondary circulation which does not conform to the twin-circulatory flow usually to be found in pipe bends. The secondary flow is dominated by a single circulation about the axis in either a clockwise or an anticlockwise sense, between which it switches abruptly at a low, random frequency. The phenomenon is explained in terms of the asymmetry of the inner wall separation and the turbulent axial circulation generated in the upstream flow.

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