Abstract
The axial velocity field in a tube of arbitrary cross-section geometry is determined for the case in which a viscoelastic fluid obeys a constitutive law of the multiple-integral type. The flow is linearized by means of a perturbation scheme for small amplitud oscillations of the pressure gradient. At the first order for the velocity, a solution is found for cross-section contours of a wide variaty of shapes. In this method the no-slip boundary condition is imposed in contours whose shape depends on an infinite set of arbitrary functions that can be selected according to some guiding rules. In this manner, the resulting cross-sections approach ellipses, triangles, squares and many other regular and non-regular shapes. The analysis shows that very complex flow patterns, as depicted by isovel curves, develop according to the values of the fluid parameters and the solid boundary shapes. These results are necessary for further developments leading to the study of secondary flows. The paper presents the analytical formulations and the flow fields associated to several tube geometries and different values of the fluid parameters.
| Original language | English |
|---|---|
| Pages (from-to) | 221-224 |
| Number of pages | 4 |
| Journal | American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED |
| Volume | 243 |
| Publication status | Published - 1997 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
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Pulsating viscoelastic flow in tubes of arbitrary cross-section shapes. / Letelier, Mario F.; Siginer, Dennis A.
In: American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED, Vol. 243, 1997, p. 221-224.Research output: Contribution to journal › Article
TY - JOUR
T1 - Pulsating viscoelastic flow in tubes of arbitrary cross-section shapes
AU - Letelier, Mario F.
AU - Siginer, Dennis A.
PY - 1997
Y1 - 1997
N2 - The axial velocity field in a tube of arbitrary cross-section geometry is determined for the case in which a viscoelastic fluid obeys a constitutive law of the multiple-integral type. The flow is linearized by means of a perturbation scheme for small amplitud oscillations of the pressure gradient. At the first order for the velocity, a solution is found for cross-section contours of a wide variaty of shapes. In this method the no-slip boundary condition is imposed in contours whose shape depends on an infinite set of arbitrary functions that can be selected according to some guiding rules. In this manner, the resulting cross-sections approach ellipses, triangles, squares and many other regular and non-regular shapes. The analysis shows that very complex flow patterns, as depicted by isovel curves, develop according to the values of the fluid parameters and the solid boundary shapes. These results are necessary for further developments leading to the study of secondary flows. The paper presents the analytical formulations and the flow fields associated to several tube geometries and different values of the fluid parameters.
AB - The axial velocity field in a tube of arbitrary cross-section geometry is determined for the case in which a viscoelastic fluid obeys a constitutive law of the multiple-integral type. The flow is linearized by means of a perturbation scheme for small amplitud oscillations of the pressure gradient. At the first order for the velocity, a solution is found for cross-section contours of a wide variaty of shapes. In this method the no-slip boundary condition is imposed in contours whose shape depends on an infinite set of arbitrary functions that can be selected according to some guiding rules. In this manner, the resulting cross-sections approach ellipses, triangles, squares and many other regular and non-regular shapes. The analysis shows that very complex flow patterns, as depicted by isovel curves, develop according to the values of the fluid parameters and the solid boundary shapes. These results are necessary for further developments leading to the study of secondary flows. The paper presents the analytical formulations and the flow fields associated to several tube geometries and different values of the fluid parameters.
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M3 - Article
VL - 243
SP - 221
EP - 224
JO - American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
JF - American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
SN - 0888-8116
ER -