Drag Reduction in Pipes Lined with Riblets

Liu, K. N.; Christodoulou, Christiana; Riccius, O.; Joseph, Daniel D.

doi:10.1007/978-3-642-50971-1_45

Cited by 15 publications

(11 citation statements)

References 2 publications

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“…As riblets are applied to the inside surface of a pipe, the riblet tips are shifted together owing to the curve of the pipe wall. Consequently, the optimized s + range for riblets in pipe flow is lower than that for the same riblets in flow over a flat surface (Liu et al 1990). Additionally, the decrease in s + suggests that an increased drag reduction in round pipes might be seen with a larger characteristic angle, a, than for flow over riblets on a flat surface.…”

Section: (C) Riblet Trends In Pipe Flowmentioning

confidence: 92%

“…Due to the difficulty of riblet application in pipes, data are generally limited to applications of sawtooth-riblet film produced by 3M (Liu et al 1990;Rohr et al 1992). Drag-reduction tests in pipe flow are carried out by comparing the pressure drop in a riblet-lined pipe with that of a similar pipe with a smooth surface.…”

Section: (C) Riblet Trends In Pipe Flowmentioning

confidence: 99%

“…(ii) Liu et al (1990) and Bechert et al (1997b)). most researchers have opted for traditional milling or moulding methods over the microfabrication techniques used in the microtechnology industry.…”

Section: Riblet Fabrication and Applicationsmentioning

confidence: 99%

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Shark-skin surfaces for fluid-drag reduction in turbulent flow: a review

Dean

Bhushan

2010

Phil. Trans. R. Soc. A.

605

381

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The skin of fast-swimming sharks exhibits riblet structures aligned in the direction of flow that are known to reduce skin friction drag in the turbulent-flow regime. Structures have been fabricated for study and application that replicate and improve upon the natural shape of the shark-skin riblets, providing a maximum drag reduction of nearly 10 per cent. Mechanisms of fluid drag in turbulent flow and riblet-drag reduction theories from experiment and simulation are discussed. A review of riblet-performance studies is given, and optimal riblet geometries are defined. A survey of studies experimenting with riblettopped shark-scale replicas is also given. A method for selecting optimal riblet dimensions based on fluid-flow characteristics is detailed, and current manufacturing techniques are outlined. Due to the presence of small amounts of mucus on the skin of a shark, it is expected that the localized application of hydrophobic materials will alter the flow field around the riblets in some way beneficial to the goals of increased drag reduction.

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Section: (C) Riblet Trends In Pipe Flowmentioning

confidence: 92%

Section: (C) Riblet Trends In Pipe Flowmentioning

confidence: 99%

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Shark-skin surfaces for fluid-drag reduction in turbulent flow: a review

Dean

Bhushan

2010

Phil. Trans. R. Soc. A.

605

381

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“…Because of such advantage of the microstructure, many kinds of simplified straight microgrooves imitating sharkskin have been manufactured with a certain level of satisfactory performance [4,5]. By using 25.4-and 50.8-mm-diameter pipes lined with a film of microgrooved equilateral triangles of base 0.11 mm, Liu et al [6] demonstrated the drag-reducing efficiency could reach 5-7% in fully developed turbulent water flow. With biomimetic technology study, Luo and Zhang [7] applied microgrooved surface in nature gas pipelining to reduce drag and showed that the pressure loss can be decreased more than 8% at the same circumstance in field.…”

Section: Beneficial Functions Of Textured Surfacementioning

confidence: 99%

Dressing strategy and grinding control for cylindrical microstructural surface

Cao

Chen

2018

Int J Adv Manuf Technol

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Surface structural texture is designed to achieve specific functional performance for many advanced applications. After a brief review of current manufacturing methods for textural surface, this paper focuses on the study of microstructural surface creation by grinding. The axial and peripheral cross-sections of textured wheels under different dressing overlap ratios U d are illustrated. A set of microstructural texturing models are proposed and the influences of dressing and grinding parameters are discussed. The texture formation is analysed in considering each cutting point in grinding kinematic movement. A significant effect of the grinding contact length on the texture formation is noticed, which defines a texture pattern limitation for grinding to manipulate. Typical surface texture characteristics are introduced to assess the structural surface features and the corresponding theoretical models are validated by experimental results. The relationships between the textural gouge size and the kinematic conditions of dressing and grinding have been delineated for the guidance of grinding texturing strategy. The component waviness on textured components clearly shows the importance of rotational ratio on the layout of microstructural texture. The paper lays down an important foundation for surface microstructural texturing by grinding.

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“…The researchers varied the geometrical characteristics of the grooves, hoping to understand the riblets effects on the turbulent flow. Liu, Christodoulou, Reccius and Joseph, 1990 [3] were interested in the reduction of the friction drag in the turbulent flow in circular grooved conduct. Vugoslavecevic, Wallace and Balint, 1992 [4] found the results which indicate the longitudinal shear stress in the level of the picks increase in about 85% in comparison with the smooth case.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Approach on the Study of Turbulent Water Flow over Smooth and L-shaped Riblets Surfaces

Brima

Atmani

Achour

2008

Inter J Fluid Mech Res

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A very important research effort has been developed at many world laboratories these last years in order to reduce the friction drag. For the aircraft and the submarine applications, friction contributes respectively for about 50% and 70% of the total resistance. The use of surface modifications riblets as a means of reducing viscous drag on a body has potential aerodynamic and hydrodynamic applications. In the present study, the theoretical approach allow to determine the velocity field, the wall shear stress, the local skin friction, the boundary layer thickness, the laminar sub layer thickness and the dimensionless drag coefficient. The results found, indicate that the presence of L-shaped riblets surfaces provide changes in the characteristics of the turbulent boundary layer, which are in favor of wall skin friction.KEYWORDS: turbulent flow, riblets, shear stress, layer thickness, friction reduction. RESUMEUn effort très important a été fourni ces dernières années à travers les laboratoires du monde dans le domaine de la réduction de traînée visqueuse. Pour les avions de transport et les sous marins, la traînée visqueuse contribue respectivement d'environ 50% à 70% de la résistance totale. L'utilisation des modifications au niveau de la surface est un moyen efficace pour réduire la traînée visqueuse dans les applications aérodynamique et hydrodynamique. Dans cette étude, l'approche théorique permis de déterminer le champ de vitesse, la contrainte de cisaillement à la paroi, le coefficient de frottement local, l'épaisseur de la couche limite, l'épaisseur de la sous couche visqueuse et finalement le coefficient non dimensionnel de traînée sont représentés. Les résultats trouvés ont montré que la présence des rainures en lames " L " fournie des changements dans les caractéristiques de la couche limite turbulente, qui sont en faveur du coefficient de frottement pariétal.MOTS CLES : écoulement turbulent, riblets, contrainte de cisaillement, épaisseur de couche, réduction de frottement.

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Drag Reduction in Pipes Lined with Riblets

Cited by 15 publications

References 2 publications

Shark-skin surfaces for fluid-drag reduction in turbulent flow: a review

Shark-skin surfaces for fluid-drag reduction in turbulent flow: a review

Dressing strategy and grinding control for cylindrical microstructural surface

Theoretical Approach on the Study of Turbulent Water Flow over Smooth and L-shaped Riblets Surfaces

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