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).

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

scholarly journals Heat transfer and flow structure through a backward-and forward-facing step micro-channels equipped with obstacles

2020 ◽  
pp. 219-219 ◽  
Author(s):  
Hassnia Hajji ◽  
Lioua Kolsi ◽  
Faouzi Askri ◽  
Chemseddine Maatki ◽  
Walid Hassen ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Reynolds Numbers ◽  
Considerable Effect ◽  
Sudden Expansion ◽  
The Finite Element Method ◽  
Enhancement Of Heat Transfer ◽  
Low Reynolds Numbers ◽  
Micro Channels ◽  
Vortex Separation ◽  
Flow Through

This study presents two-dimensional simulations of a flow-through a sudden expansion/contraction micro-channel with the existence of obstacles. The bottom wall is maintained at constant flux, while the other walls are adiabatic. Rectangular adiabatic obstacles are mounted before the expansion region on the upper and lower wall of the channel used. The finite element method was used to discretize the equations that govern the physical model. Results indicate the apparition of a separate vortex, situated in the corner after the sudden expansion of the microchannel for low Reynolds numbers. For higher values and expansion ratios, the vortex separation length increases. The obtained results show that the obstacles have a considerable effect on the dynamics of the flow and enhancement of heat transfer.

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