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Saturday, May 2, 2020 | History

4 edition of Viscous flow drag reduction found in the catalog.

Viscous flow drag reduction

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Published by American Institute of Aeronautics and Astronautics in New York .
Written in English

    Subjects:
  • Drag (Aerodynamics),
  • Skin friction (Aerodynamics),
  • Frictional resistance (Hydrodynamics),
  • Turbulent boundary layer.

  • Edition Notes

    Includes bibliographical references and index.

    Statementedited by Gary R. Hough.
    SeriesProgress in astronautics and aeronautics ;, v. 72
    ContributionsHough, Gary R.
    Classifications
    LC ClassificationsTL507 .P75 vol. 72, TL574.D7 .P75 vol. 72
    The Physical Object
    Paginationxxviii, 453 p. :
    Number of Pages453
    ID Numbers
    Open LibraryOL4112639M
    ISBN 100915928442
    LC Control Number80027715

    Comparing frictionless flow in a tube to viscous flow, as in Figure 4, we see that for a viscous fluid, speed is greatest at midstream because of drag at the boundaries. We can see the effect of viscosity in a Bunsen burner flame, even though the viscosity of natural gas is small. Lubricant-impregnated surfaces (LIS), where micro/nanotextured surfaces are impregnated with lubricating liquids, have received significant attention for their robust, superslippery properties. In this study, we systematically demonstrate the potential for LIS to reduce drag in laminar flows. We present a scaling model that incorporates the viscosity of the lubricant and elucidates the Cited by:

    Trove: Find and get Australian resources. Books, images, historic newspapers, maps, archives and more.   A better and less flippant answer is to consider the reduction in pump efficiency (also head and flow) and calculate the maximum required and corrected horsepower (hp) for the viscous fluid. Several references limit centrifugal pumps to a maximum of 3, centistokes.

      A simple method for estimating the maximum lift/drag ratio of a new design is derived from the skin friction drag of an equivalent flat plate, form drag and a statistical correction for distributed roughness. Promising aerodynamic technologies for drag reduction are discussed, such as laminar flow control and lateral wing camber.   In the so-called viscous regime of vanishing riblet spacing, the drag reduction is proportional to the riblet size, but for larger riblets the proportionality breaks down, and the drag reduction eventually becomes an increase A REVIEW OF DRAG REDUCTION BY RIBLETS AND MICRO- TEXTURES IN THE TURBULENT BOUNDARY LAYERS Samira Sayad Saravi, .


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Viscous flow drag reduction Download PDF EPUB FB2

For example, it can comprise up to 50% of the total drag on an aircraft in the cruise condition. Reduction of viscous drag has therefore been the object of many recent studies.

In this volume, current work on drag reduction in viscous flows is presented and related progress is assessed. Description. This volume authoritatively treats viscous drag reduction in four major categories--laminar flow control, passive turbulent drag reduction, active turbulent drag reduction, and interactive turbulent drag reduction--and presents emerging technologies, such as the use of surfactants, as an alternative to polymers.

Additional Physical Format: Online version: Viscous flow drag reduction. New York: American Institute of Aeronautics and Astronautics, © (OCoLC) @article{osti_, title = {Viscous drag reduction in boundary layers}, author = {Bushnell, D.M.

and Hefner, J.N.}, abstractNote = {The present volume discusses the development status of stability theory for laminar flow control design, applied aspects of laminar-flow technology, transition delays using compliant walls, the application of CFD to skin friction drag-reduction.

Viscous drag reduction caused by polymer injection into a developing turbulent boundary layer was investigated in a inch I.D.

hydraulically rough pipe. Pressure drop measurements were made in the first diameters of the pipe. Velocity profile and concentration profile measurements were also taken. Stability theory for laminar flow control design / Mujeeb R. Malik --Applied aspects of laminar-flow technology / A.L.

Braslow [and others] --Status of transition delay using compliant walls / Peter W. Carpenter --Application of CFD to reduction of skin-friction drag / Tuncer Cebeci --Active wave control of boundary-layer transition / Andrew S.

For example, viscous drag generally varies directly with the flow speed, whereas pressure drag varies with the square of the speed. Scientists use a dimensionless ratio called the Reynolds number to give a measure of the relative importance of viscous or pressure drag in particular conditions.

The Reynolds number, Re, b is given by. VISCOUS DRAG REDUCTION IN BOUNDARY LAYERS Download Viscous Drag Reduction In Boundary Layers ebook PDF or Read Online books in PDF, EPUB, and Mobi Format.

Click Download or Read Online button to VISCOUS DRAG REDUCTION IN BOUNDARY LAYERS book pdf for free now. Buy Viscous Flow Drag Reduction Paas72 (Progress in astronautics and aeronautics) on FREE SHIPPING on qualified orders.

This volume authoritatively treats viscous drag reduction in four major categories--laminar flow control, passive turbulent drag reduction, active turbulent drag reduction, and interactive turbulent drag reduction--and presents emerging technologies, such as the use of surfactants, as an alternative to : Hardcover.

The potential drag reduction and suction requirements, including the necessary compressor power, are calculated on component level using a flow solver with viscid/inviscid coupling and a. Book Reviews. Viscous Flow Drag Reduction (Progress in Astronautics and Aeronautics, Vol.

72) Gary R. Hough, Editor. Gary R. Hough, Editor. Search for other works by this author on: This Site. PubMed.

Aeronautics, Drag reduction, Viscous flow. Article PDF first page by: 5. In fluid dynamics, drag (sometimes called air resistance, a type of friction, or fluid resistance, another type of friction or fluid friction) is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid.

This can exist between two fluid layers (or surfaces) or a fluid and a solid surface. Unlike other resistive forces, such as dry friction, which. Viscous Drag Reduction Proceedings of the Symposium on Viscous Drag Reduction held at the LTV Research Center, Dallas, Texas, September 24 The Flow of a Dilute Polymer Solution in a Turbulent Boundary Layer on a Flat Plate.

Viscous Drag Reduction Book. In this example the skin friction drag of the SR22 wing will be evaluated, neglecting the interference between it and the fuselage (this is done in Example ).The wing’s pertinent dimensions are shown in Figurebut these were obtained by scaling by the reported wing span of actual wings features three distinct NLF airfoils, but for this example.

Fluid Mech. (), vol.pp. Printed in Great Britain The viscous flow on surfaces with longitudinal ribs By D. BECHERT AND M. BARTENWERFER DLR, Abteilung Turbulenzforschung, Miiller-Breslau-StraBe 8, Berlin-W West Germany (Received 29 June and in revised form 13 January ) The viscous sublayer of a turbulent boundary.

Recent developments in turbulent drag-reduction research using riblets, spanwisewall oscillation and compliant coating are sketched here together with some experimental results.

Views on drag reduction mechanisms are then given using the evidence derived from these experimental by: Drag reduction investigations in a turbulent flow over a riblet-coverd surface is performed for two models: straight riblets and sinusoidal riblets with ratio (a/λ=).

Viscous drag reduction of a fully‐submerged body of revolution is obtained by creating hydrogen gas on the hull by electrolysis. The bubbles alter both the laminar and turbulent boundary‐layer characteristics resulting in a significant reduction in the viscous drag on the 3‐foot model up to a speed of feet per second, the maximum test by: SIAM Journal on Control and OptimizationAbstract | PDF ( KB) () Adaptive finite element method for an optimal control problem of Cited by:.

This book deals with the details of some of the theories used to cope with this problem. In particular, this book is concerned with viscous-gas-flow problems involving reacting gas mixtures.

Starting from the statement of the boundary-layer equations for a mixture of gases, the theory is developed for both the laminar and turbulent boundary : Dover Publications.() Reduction of modes for the control of viscous flows. International Journal of Engineering Science() Оптимальное граничное управление стационарным течением вязкой неоднородной несжимаемой by: Abstract A periodic-viscous-sublayer model is used to describe the wall turbulence in a viscoelastic fluid.

The basic flow characteristics are calculated by introducing the kinematic conditions for joining the averaged characteristics of the .