On the asymptotic behavior of a linear viscoelastic fluid

2012 ◽  
Vol 35 (7) ◽  
pp. 769-775 ◽  
Author(s):  
Mauro Fabrizio ◽  
Barbara Lazzari ◽  
Roberta Nibbi
Keyword(s):  
Asymptotic Behavior ◽  
Viscoelastic Fluid ◽  
Linear Viscoelastic ◽  
Linear Viscoelastic Fluid

Unsteady Flow of a Non-Linear Viscoelastic Fluid in Pipes

2004 ◽  
Author(s):  
Mario F. Letelier ◽  
Nicola´s Madariaga ◽  
Dennis A. Siginer
Keyword(s):  
Velocity Field ◽  
Constitutive Equation ◽  
Pressure Gradient ◽  
Perturbation Method ◽  
Viscoelastic Fluid ◽  
Material Parameter ◽  
Ptt Model ◽  
Linear Viscoelastic ◽  
Dynamic Variables ◽  
Linear Viscoelastic Fluid

Flow of a viscoelastic fluid in round pipes is analyzed for the case where the pressure gradient is oscillatory with varying amplitude. The fluid is modelled according to Phan-Thien-Tanner’s constitutive equation. The analysis is carried out by using the perturbation method in which a material parameter is considered small. Velocity field and other kinematic and dynamic variables are evaluated for a range of relevant parameters. The results are compared with the base Newtonian and linear Maxwell flows. The effect of the PTT model in these type of flows is highlighted.

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