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International Journal of Fluid Mechanics Research

年間 6 号発行

ISSN 印刷: 2152-5102

ISSN オンライン: 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

Edge Effect in Cone and Plate Rheometer

巻 39, 発行 5, 2012, pp. 448-465
DOI: 10.1615/InterJFluidMechRes.v39.i5.60
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要約

This paper investigates theoretically and numerically the influence of the edge effect on rheological measurements in cone-plate rheometer. Theoretical discussion for the flow generated by the slow steady rotation of a cone in Newtonian fluid confined by stationary plate is presented. Due to the complicated shape of the boundary, analytical methods cannot be utilized, hence we propose a numerical procedure to solve the problem. The complex flow behavior between finite rotating cone and stationary plate is modeled using the computational Fluid Dynamic software package Fluent 6.3. Equations of motion for steady, axisymmetric, isothermal flow of incompressible Newtonian fluid coupled with continuity equation are solved numerically. The influence of edge effect on flow charac-teristics as a function of cone radius, gap angle, and angular speed is numerically studied. It is shown that the infinite cone and plate assumption is valid for a gap angle of less than 5°. It is also shown that the error in torque measurement due to edge effect is less that 5 % for a gap angle equals or less than 5° up to Reynolds number Re = ΩR2/v less than 860. Also, when Re is less than 86 for all gap angles studied, the maximum error in torque due to edge effect is less than 5 %. Also, it is shown that reducing the radius of the cone successfully allows the device to be used for high shear rates while maintain acceptable errors. A new definition of Reynolds number that includes gap angle is proposed. The values of the modified Reynolds number successfully characterize the flow regime. Finally, the presented numerical models have been verified against experimental results.

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