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International Journal of Fluid Mechanics Research

Publicou 6 edições por ano

ISSN Imprimir: 2152-5102

ISSN On-line: 2152-5110

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.1 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.0002 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.33 SJR: 0.256 SNIP: 0.49 CiteScore™:: 2.4 H-Index: 23

Indexed in

Solutions of Polymers under the Conditions of Wall Turbulence. Mechanism of Drag Reduction

Volume 29, Edição 6, 2002, 19 pages
DOI: 10.1615/InterJFluidMechRes.v29.i6.90
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RESUMO

Results of a polarization-optical investigation of a wall turbulent flow of the solutions of polyethylene oxide (PEO) are presented in the paper. They prove that, within certain zones of the boundary layer, the macromolecules are subjected to a strong deformation effect of the hydrodynamic field. The experimental findings presented in the paper support the idea that the mechanism of drag reduction is uniquely related to the process of strong deformation of the macromolecules, which give rise to the nonlinear effects of elasticity. The adequate experimental verification of unrolling of the molecules under the conditions of wall turbulence illustrates that the employment of non-turbulent flows with stretching for studying the interaction between the macromolecules and the hydrodynamic field has some advantages. This allows an experimental investigation into the "anomalous" effects under the controlled conditions and provides a way of simulating the basic properties of the turbulent boundary layer. The velocity, velocity gradient fields and the degree of the unrolling of the macromolecules in the entry zone of a short capillary (under the modeled conditions of wall turbulence) are studied experimentally. If the flow is converging, the macromolecules are subjected to the considerable unrolling (up to 60 %) under the action of the hydrodynamic field, which leads to reconfiguration of this field. It is found that the behavior of the macromolecules in a flow with a longitudinal velocity gradient along with the effects of elastic deformations, which manifest themselves in this case, are essential for understanding of nature of the "anomalously" low turbulent friction observed in a flow of polymer solutions.

CITADO POR
  1. Pogrebnyak V. G., Pogrebnyak A. V., Perkun I. V., Maxwell fluid flow in system supplying hydrodynamically active polymer to boundary layer of streamlined object, Mathematical Modeling and Computing, 8, 1, 2021. Crossref

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