20
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Initial instabilities of a granular bed sheared by a turbulent liquid flow: length-scale determination

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          The transport of granular matter by a fluid flow is frequently found in nature and in industry. When the shear stresses exerted by the fluid flow on a granular bed are bounded to some limits, a mobile granular layer known as bed-load takes place, in which the grainsstay in contact with the fixed part of the granular bed. Under these conditions, an initiallyflat granular bed may be unstable, generating ripples and dunes, such as those observed indeserts, but also in pipelines conveying sand. There are evidences that these forms have atypical length correlated to their initial wavelength. So, the length-scale of the initial linear instabilities is a key point to understand the typical structures observed. This paper presents a theoretical study of the initial instabilities on a granular bed sheared by aturbulent liquid flow without free-surface effects, when bed-load is present. This studyconsists of a linear stability analysis, taking into consideration fluid flow, relaxation and gravity effects, and it is compared to published experimental data. It is proposed here,differently from many previous studies, that the initial wavelength of bed-forms varies with flow conditions when the fluid is a liquid.

          Related collections

          Most cited references26

          • Record: found
          • Abstract: not found
          • Article: not found

          Turbulent wind flow over a low hill

            Bookmark
            • Record: found
            • Abstract: not found
            • Book: not found

            Hydrodynamic Stability

              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              The mechanics of dunes and antidunes in erodible-bed channels

                Bookmark

                Author and article information

                Journal
                jbsmse
                Journal of the Brazilian Society of Mechanical Sciences and Engineering
                J. Braz. Soc. Mech. Sci. & Eng.
                Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM (Rio de Janeiro, RJ, Brazil )
                1678-5878
                1806-3691
                December 2010
                : 32
                : 4
                : 460-467
                Affiliations
                [01] Campinas SP orgnameCampinas State University orgdiv1Faculty of Mechanical Engineering Brazil franklin@ 123456fem.unicamp.br
                Article
                S1678-58782010000400008 S1678-5878(10)03200408
                10.1590/S1678-58782010000400008
                0b714d10-4c0f-4a61-a84f-dd38770ea2ab

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : March 2010
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 29, Pages: 8
                Product

                SciELO Brazil

                Categories
                Technical Papers

                pattern formation,two-phase flow,instabilities,granular bed,bed-load

                Comments

                Comment on this article