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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

Rough-Wall Heat Transfer in Tbrbulent Boundary Layers

巻 25, 発行 1-3, 1998, pp. 212-219
DOI: 10.1615/InterJFluidMechRes.v25.i1-3.180
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要約

Measurements for heat transfer in the rough wall turbulent boundary layers are presented. This paper summarizes the previous experimental results for six test surfaces five rough and one smooth. Three of the rough surfaces are smooth plates roughened with hemispherical elements uniformly distributed 2, 4, and 10 base diameters apart. The remaining two rough surfaces are smooth plates roughened with truncated, right circular cones uniformly distributed 2 and 4 base diameters apart. Both of the roughness geometries hemispheres and truncated cones have a 1.27 mm base diameter and a roughness height of 0.635 mm. The Stanton number data are for zero pressure gradient incompressible turbulent boundary layer air flow for several freestream velocities ranging from 6 to 66 m/s which cover the aerodynamically smooth transitionally rough and fully rough flow regimes. These data are compared with previously published results from another similar test facility using a rough surface comprised of spheres of a single size (1.27 mm diameter) packed in the most dense array. It is shown that data for a given rough surface viewed in Stanton number versus enthalpy thickness coordinates do not collapse to a single curve in the fully rough regime as had been postulated based on observations of a single set of rough wall data. The heat transfer data also show that for a given surface Stanton number data in Rex, coordinates approach an asymptotic curve as freestream velocity is increased, becoming a function of Rex, alone (as in the case for smooth wall turbulent flows). However, there is a different asymptotic St-Rex curve for each rough surface, with Stanton number at a given Rex, increasing with decreasing roughness spacing, that is as the surface becomes "rougher". The data also show a measurable difference in Stanton numbers due to roughness elements shape effects.

によって引用された
  1. Stripf M. , Schulz A. , Wittig S. , Surface Roughness Effects on External Heat Transfer of a HP Turbine Vane , Journal of Turbomachinery, 127, 1, 2005. Crossref

  2. Frederick Robert A., Thomas Lawrence, Ligrani Phillip M., Propulsion Research and Academic Programs at the University of Alabama in Huntsville - 30th Anniversary Summary, AIAA Propulsion and Energy 2021 Forum, 2021. Crossref

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