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ФИО авторов:
Begjanov Amirbek, Khajiboyeva Surayyo, Babajanova Yulduz
Urganch Davlat Universiteti o’qituvchilari
Название публикации:
«NON-STATIONARY FLOW OF A VISCOELASTIC
FLUID IN A PLANE CHANNEL»
Abstract:
The article considers a slow unsteady flow of an elastic-viscous
fluid in a flat channel under the influence of a sudden application of a constant
pressure gradient. The flows are described by a simplified differential equation of
fluid motion in Cartesian coordinates, taking into account the rheological equation of
an elastic-viscous fluid. Instead of the rheological equation of an elastoviscous fluid,
the Shulman-Housid model is adopted. The initial and boundary conditions are
formulated. The problem is solved by an analytical method, using the Laplace-Carson
transformation. Calculation formulas for the distribution of longitudinal velocity and
fluid flow are obtained.
Key words:
Elastic-viscous fluid, Shulman-Husid model of unsteady flow,
longitudinal velocity, transformations.
Studies [3-5] show that solving the problem of unsteady flow of a viscoelastic
fluid in pipelines leads to significant mathematical difficulties. Therefore, when
solving problems, simplification methods are used, or the problem [7,8] is solved in a
one-dimensional setting with concentrated velocities over the pipe section. In most
works [3-5], it is stated that transient processes occur in unsteady flow, which
significantly depend on the properties of the liquids flowing in them. This article
solves specific problems of non-stationary flow of an elastic-viscous fluid in a flat
channel and analyzes transient processes. In addition, when solving one-dimensional
problems, the data obtained are not only of great importance for discovering new
hydrodynamic effects, but are also a reliable source for comparison with the results of
studying an elastic-viscous fluid in a more complex formulation.
On the basis of the rheological models of an elastic-viscous fluid proposed in
[4, 5], we will solve non-stationary problems in pipes and channels, where the fluid is
assumed to be elastic-viscous and incompressible, and its motion is laminar,
98
axisymmetric. In this case, the movement of fluid in pipes, taking into account its
rheological properties, is described by simplified equations of the following form
,
,
,
1
2
,
0,
,
,
.
xy
k xy
k
xy
k xy
k xy
k
k
k
k
k
k
k
k
k
k
u
p
p
t
x
y
y
g
u
p
t
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