Hydroelastic instability of viscoelastic fluids in developing flow through a compliant channel

Safarifard, Morteza; Aghaee, Zahra; Pourjafar, M.; Bazargan, S.; Sadeghy, Kayvan

doi:10.1007/s13367-020-0010-9

Cited by 1 publication

(3 citation statements)

References 45 publications

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“…When modeling an unstabilized flow in a hydrodynamic initial section, a system of differential equations describing such a flow, after appropriate transformations, reduces to one differential equation regarding the projection of the velocity vector onto the longitudinal coordinate. An important criterion of the computational scheme for studying the flows of a viscous fluid that is not compressed is the efficiency of taking into account the hydrodynamic conditions of entry into the initial section, which is located behind local obstacles of various types and regulating equipment -formula (1).…”

Section: Discussion Of Results Of the Influence Of Hydrodynamic Condi...mentioning

confidence: 99%

“…With distance from the input section of the channel, the velocity profile is gradually transformed into a parabola, which is realized at the end of the hydrodynamic stabilization region L I determined by formula (1). The length of the initial section was compared with similar calculations obtained by the analytical method and experimental data given in [22,23].…”

Section: Discussion Of Results Of the Influence Of Hydrodynamic Condi...mentioning

confidence: 99%

“…In [1], analytical and numerical studies into the flow of a viscoelastic fluid obeying the Walters B-model in the input region of a flat channel formed between two parallel plates are reported. Velocity profiles were built by using a boundary layer theory.…”

Section: Introductionmentioning

confidence: 99%

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Determining a flow structure in the region of local obstacles of different types taking into account the hydrodynamic conditions for entering the initial section

Nosko

Kostiuk

Haletskyi

et al. 2023

EEJET

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This paper investigates the influence of hydrodynamic conditions for entering the initial section of the channel located after local obstacles of various types. It is shown that the head losses in the valves and bends of pipelines and in various control elements can be several times higher than those in straight sections of the pipeline. It was established that the assumption about the rectangular shape of the velocity diagram at the entrance to the hydrodynamic initial section does not correspond to the flow pattern in real channels of technological equipment. It is proved that with the manifestation of inertia forces in the flow at the initial section of the channel, hydrodynamic energy losses usually increase, velocity and stress fields are significantly deformed. Given this, it seemed expedient to conduct a study into the processes of flow of viscous liquids in the initial section, located after local obstacles of various types. Experimental and analytical studies have confirmed that there is a significant influence of boundary conditions at the entrance to the initial section on the formation of velocity diagrams and energy loss along its length. The analytical-numerical solution to the system of differential equations describing such flow is given. While solving, the system of equations, by appropriate transformations, takes the form of a nonlinear integral-differential equation. This makes it possible to obtain correct dependences for determining the length of the velocity distribution and energy loss in the investigated section of the channel. The results of calculations of velocity fields in the region of local obstacles agree well with known ideas of the flow pattern, which is observed in physical experiments and the results of analytical solutions. The quantitative difference in results ranges within 12–20 % depending on the Reynolds number. Thus, there is reason to assert that the results of studies reported here could be the basis for devising a procedure of hydrodynamic calculation aimed at structural and operational improvement of existing and designed technological equipment.

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Section: Discussion Of Results Of the Influence Of Hydrodynamic Condi...mentioning

confidence: 99%

Section: Discussion Of Results Of the Influence Of Hydrodynamic Condi...mentioning

confidence: 99%

See 1 more Smart Citation

Determining a flow structure in the region of local obstacles of different types taking into account the hydrodynamic conditions for entering the initial section

Nosko

Kostiuk

Haletskyi

et al. 2023

EEJET

View full text Add to dashboard Cite

show abstract

Hydroelastic instability of viscoelastic fluids in developing flow through a compliant channel

Cited by 1 publication

References 45 publications

Determining a flow structure in the region of local obstacles of different types taking into account the hydrodynamic conditions for entering the initial section

Determining a flow structure in the region of local obstacles of different types taking into account the hydrodynamic conditions for entering the initial section

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