A new mechanism for periodic bursting of the recirculation region in the flow through a sudden expansion in a circular pipe

2018 ◽  
Vol 30 (3) ◽  
pp. 031701 ◽  
Author(s):  
Benoit Lebon ◽  
Minh Quan Nguyen ◽  
Jorge Peixinho ◽  
Mostafa Safdari Shadloo ◽  
Abdellah Hadjadj
Keyword(s):  
Circular Pipe ◽  
Sudden Expansion ◽  
Recirculation Region ◽  
Flow Through

Transient growth analysis of flow through a sudden expansion in a circular pipe

2010 ◽  
Vol 22 (3) ◽  
pp. 034101 ◽  
Author(s):  
C. D. Cantwell ◽  
D. Barkley ◽  
H. M. Blackburn
Keyword(s):  
Growth Analysis ◽  
Circular Pipe ◽  
Sudden Expansion ◽  
Transient Growth ◽  
Flow Through

Bifurcation phenomena in the flow through a sudden expansion in a circular pipe

2009 ◽  
Vol 21 (1) ◽  
pp. 014110 ◽  
Author(s):  
T. Mullin ◽  
J. R. T. Seddon ◽  
M. D. Mantle ◽  
A. J. Sederman
Keyword(s):  
Circular Pipe ◽  
Sudden Expansion ◽  
Bifurcation Phenomena ◽  
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).

Experimental Investigation of the Flow Through Axisymmetric Expansions

1989 ◽  
Vol 111 (4) ◽  
pp. 464-471 ◽  
Author(s):  
M. Stieglmeier ◽  
C. Tropea ◽  
N. Weiser ◽  
W. Nitsche
Keyword(s):  
Experimental Investigation ◽  
Reynolds Number ◽  
Shear Layer ◽  
Test Facility ◽  
Recirculation Region ◽  
Velocity Measurements ◽  
Forward Scatter ◽  
Separated Shear Layer ◽  
Flow Through ◽  
Diffusion Rates

This study examines the flow field in three axisymmetric expansions having diffuser half-angles of 14, 18, and 90 deg, respectively. Velocity measurements were performed at a Reynolds number of Re = 1.56 × 104 using a single component LDA operated in forward scatter. The test facility was refractive index matched, allowing measurement of the velocities U, V, W, u2, v2, w2, uv and uw upstream of, and throughout the entire recirculation region. The results indicate that the diffuser geometry influences the separated shear layer appreciably over the entire length of the diffuser section. The production of turbulence immediately after separation is much higher in the case of the 14 and 18 deg diffuser compared to the 90 deg expansion, leading to higher diffusion rates in the separated shear layer, and hence earlier reattachment of the shear layer.

Sign in / Sign up

Export Citation Format

Share Document