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国际流体力学研究期刊

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ISSN 打印: 2152-5102

ISSN 在线: 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

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Effect of Polymer on Drag Reduction in a Sudden Enlargement of Pipe Cross Section

卷 37, 册 2, 2010, pp. 101-110
DOI: 10.1615/InterJFluidMechRes.v37.i2.10
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摘要

The purpose of the present paper is to study experimentally the effect of drag reducing polymers on loasses due to friction and sudden enlargement of pipe cross section. Polymers used in this research include copolymer of acrylamaide with a cationic acid (ACA) and sodium carboxymethyl cellulose (CMC). Two different geometeries were considered, a sudden enlargement in pipe diameter from 27 to 40.5 mm diameter ratio (DR) of 1 : 1.75, and (b) from 27 to 54 mm (DR =1 : 2). The effect of Reynolds number change, polymer type, polymer concentration, and area ratio were studied. The upstream Reynolds number was varied from 5 · 104 to 105 and polymer concentration from 3 to 32 ppm inside the test section. The experimental results showed that the percent drag reduction increases with increasing both Reynolds number and polymer concentration. Drag reduction up to 63.47 % was obtained at 5 · 104 Reynolds with 32 ppm of ACA in upstream side and drag reduction reappears in downstream side when it was large in the upstream side. While CMC was not effective when used as a drag reducing agent in this range of concentration. Moreover, the sudden enlargement factor was decreased by 18 % when using 32 ppm of ACA at 5 · 104 Reynolds number. Also, using ACA as a drag reducing agent enhances pressure distribution in the upstream and downstream pipe flow.

参考文献
  1. Paterson, R. W. and Abernathy, F. H., Transition to Turbulence in Pipe Flow for Water and Dilute Solutions of Polyethylene Oxide.

  2. Sellin, R. H. J., Hoyt, J. W., and Scirvener, O., The Effect of Drag Reducing Additives on Fluid Flows and their Idustrial Applications.

  3. Benzi, R., Saturation of Turbulent Drag Reduction in Dilute Polymer Solution.

  4. Mobarak, A., El-Sherbiny, E., and Zanoon, S., Experimental Investigation of the Effect of Polymer Injection on Drag Reduction.

  5. Tachibana, M. and Kita, M., On the Flow in a Circular Tube and the Loss due to a Sudden Enlargement.

  6. Vanapalli, S. A., Ceccio, S. L., and Soloman, M. J., Universal Scaling For Polymer Chain Scission In Turbulence.

  7. Sreenivasan, K. R. and White, C. M., The Onset of Drag Reduction by Dilute Polymer Additives and the Maximum Drag Reduction Asymptote.

  8. Pisolkar, V. G., Effect of Drag Reducing Additives on Pressure Loss Across Transitions.

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