Flow of Viscoelastic Liquids through Sudden Enlargements

1966 ◽  
Vol 5 (2) ◽  
pp. 237-242 ◽  
Author(s):  
Gianni Astarita ◽  
Luigi Nicodemo
Keyword(s):  
Viscoelastic Liquids

Elastic Effects on Rayleigh-Be´nard-Marangoni Convection in Liquids With Temperature-Dependent Viscosity

2009 ◽  
Author(s):  
G. N. Sekhar ◽  
G. Jayalatha
Keyword(s):  
Stress Relaxation ◽  
Variable Viscosity ◽  
Relaxation Parameter ◽  
Oscillatory Convection ◽  
Tight Coupling ◽  
Temperature Dependent ◽  
Temperature Dependent Viscosity ◽  
Dependent Viscosity ◽  
Viscoelastic Liquids ◽  
Retardation Parameter

A linear stability analysis of convection in viscoelastic liquids with temperature-dependent viscosity is studied using normal modes and Galerkin method. Stationary convection is shown to be the preferred mode of instability when the ratio of strain retardation parameter to stress relaxation parameter (elasticity ratio) is greater than unity. When the ratio is less than unity the possibility of oscillatory convection is shown to arise. Oscillatory convection is studied numerically for Rivlin-Ericksen, Walters B′, Maxwell and Jeffreys liquids by considering free-free and rigid-free isothermal/adiabatic boundaries. It is found that there is a tight coupling between the Rayleigh and Marangoni numbers, with an increase in one resulting in a decrease in the other. The effect of variable viscosity parameter is shown to destabilize the system. The problem reveals the stabilizing nature of strain retardation parameter and destabilizing nature of stress relaxation parameter, on the onset of convection. The Maxwell liquids are found to be more unstable than the one subscribing to Jeffreys description whereas the Rivlin-Ericksen and Walters B′ liquids are comparatively more stable. Rigid-free adiabatic boundary combination is found to give rise to a most stable system, whereas the free isothermal free adiabatic combination gives rise to a most unstable system. The problem has applications in non-isothermal systems having viscoelastic liquids as working media.

Bubble velocity and coalescence in viscoelastic liquids

1986 ◽  
Vol 41 (9) ◽  
pp. 2273-2283 ◽  
Author(s):  
D. Dekée ◽  
P.J. Carreau ◽  
J. Mordarski
Keyword(s):  
Bubble Velocity ◽  
Viscoelastic Liquids

Backmixing in multistage mixer columns—III. Slightly viscoelastic liquids

1986 ◽  
Vol 41 (9) ◽  
pp. 2431-2433 ◽  
Author(s):  
F. Magelli ◽  
D. Fajner ◽  
G. Pasquali
Keyword(s):  
Viscoelastic Liquids

Dynamics and Breakup of Viscoelastic Liquids (A Review)

2005 ◽  
Vol 40 (6) ◽  
pp. 835-853 ◽  
Author(s):  
A. N. Rozhkov
Keyword(s):  
Viscoelastic Liquids

Flow focusing with viscoelastic liquids

2013 ◽  
Vol 25 (9) ◽  
pp. 092001 ◽  
Author(s):  
Ladislav Derzsi ◽  
Marta Kasprzyk ◽  
Jan Philip Plog ◽  
Piotr Garstecki
Keyword(s):  
Flow Focusing ◽  
Viscoelastic Liquids
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