Recent Developments in Turbulence Management: Meeting Proceedings: v. 6 (Fluid Mechanics and its Applications) - Hardcover

Buch 6 von 136: Fluid Mechanics and Its Applications
 
9780792314776: Recent Developments in Turbulence Management: Meeting Proceedings: v. 6 (Fluid Mechanics and its Applications)
Hardcover
ISBN 10: 0792314778 ISBN 13: 9780792314776
Verlag: Springer, 1991

Inhaltsangabe

I. Riblets.- Experiments with a 1:4.2 model of a commuter aircraft with riblets in a large wind tunnel.- Heat transfer study of riblets.- Performances of internal manipulators in subsonic three-dimensional Flows.- High resolution conformal mesh computations for V, U or L groove riblets in laminar and turbulent boundary layers.- Coherent structures over a smooth and a triangular riblet drag reducing surface.- Some further experiments on riblet surfaces in a towing tank.- II. LEBUs.- Analytical and experimental study of energy density spectra of the outer region of a manipulated turbulent boundary layer.- Review: effect of the OLDs on near wall coherent structures; discussion and need for future work.- III. Surface Roughness.- Turbulent drag reduction of a d-type rough wall boundary layer with longitudinal thin ribs placed within the traverse grooves.- The correlation of added drag with surface roughness parameters.- IV. Compliant Surfaces.- The optimisation of compliant walls for drag reduction.- Nonlinear evolution of modes in the flow over compliant surfaces.- On conditions of modelling and choice of viscoelastic coatings for drag reduction.- Experimental investigation of one-layer viscoelastic coatings action on turbulent friction and wall pressure pulsations.- V. Polymer Additives.- The pulseless injection of polymeric additives into near-wall flow and perspectives of drag reduction.- Initial section of time-dependence of the Toms effect for solutions of poly (ethylene oxide).- Panel discussions.- List of Referees.- List of Participants.- Author Index.

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Reseña del editor

The subjects covered in this volume include riblets, LEBUs (Large Eddy Break-Up devices), surface roughness, compliant surfaces and polymer additives. Riblets seem to be one of the most extensively studied devices in the past years. Reflecting this situation in the European Community, there are six papers on riblets covering their practical applications to aircraft and to a model ship, near-wall coherent structure of boundary layer and effects of flow three-dimensionality. Possibility of heat-transfer enhancement with riblets and potential use in the laminar flow are also investigated. An analytical model is developed for the boundary-layer with a LEBU device. Physical mechanisms of turbulent skin-friction reduction with LEBUs are reviewed in the light of some recent studies. The d-type roughness is investigated in conjunction with riblets for drag reduction. A correlation method of roughness parameters with the drag penalties is also presented. Two papers are devoted to further theoretical development of compliant surfaces in transition delay. Probably one of the most exciting recent developments in turbulence management is the use of compliant surfaces in the turbulent boundary layer. There are two papers describing some theoretical experimental work carried out on this subject in the U.S.S.R. Some further studies on the effects of polymer additives are also presented. The volume concludes with an edited record of the lively panel discussions which provided a useful forum to exchange views, plans for future research, collaborative work and industrial applications of drag reduction techniques.

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Verlag
Springer
Erscheinungsdatum
1991
Sprache
Englisch
ISBN 10 
0792314778
ISBN 13 
9780792314776
Einband
Tapa dura
Anzahl der Seiten
364
Herausgeber
Choi K.-S.
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