Compliant Coatings: A Decade of Progress

Gad‐el‐Hak, Mohamed

doi:10.1115/1.3101966

Cited by 56 publications

(27 citation statements)

References 53 publications

(65 reference statements)

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“…Now, more than 50 years after the initial experiments of Kramer, there is little doubt that compliant coating may delay transition, c.f. e.g., [16]. Reynolds numbers for transition in geometries with compliant coating may exceed corresponding Reynolds numbers for flow within rigid geometries by more than an order of magnitude.…”

Section: Modelling Of Blood Flowmentioning

confidence: 98%

On the Assumption of Laminar Flow in Physiological Flows: Cerebral Aneurysms as an Illustrative Example

Evju

Mardal

2015

MS&A

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In physiological fluid flows, except for in the heart and the aorta, the Reynolds numbers are moderate (below 1000). This is far below the typical point of transition in pipe flow, which occurs around Reynolds number 2300. Because of this, laminar flow is commonly assumed in the modelling of these flows, resulting in computational methods tailored for this flow regime. This chapter presents a critical review of this assumption, and both clinical and numerical evidence of transitional physiological flows are presented. The pulsatility and complex geometries in physiological flow are highlighted as the main reasons for a lower transition point in physiological flows. Furthermore, we discuss the threshold of transition in a particular case of an aneurysm with respect to resolution, Reynolds number and non-Newtonian viscosity modelling.

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Section: Modelling Of Blood Flowmentioning

confidence: 98%

On the Assumption of Laminar Flow in Physiological Flows: Cerebral Aneurysms as an Illustrative Example

Evju

Mardal

2015

MS&A

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“…This work will be described in Sect. 6. We presume that many readers will probably not be very familiar with the various mechanical properties and characteristics of compliant walls.…”

Section: Introductionmentioning

confidence: 97%

“…However, as pointed out by Carpenter et al [2] most of the quantitative estimates contained in Gray's paper have in the meantime been shown to be inaccurate. Nevertheless, over the last twenty years it has also been clearly established, through experimental and theoretical investigations, that wall compliance can suppress the growth of Tollmien-Schlichting (TS) waves in boundary layers leading to substantial delays in the onset of laminar-turbulent transition (for reviews see [2][3][4][5][6][7]. Consequently compliant walls, or compliant coatings, are a viable method for drag reduction in such quasi-2D flow environments.…”

Section: Introductionmentioning

confidence: 99%

Flow over compliant rotating disks

Carpenter

Thomas

2006

J Eng Math

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Flow over compliant materials and compliant coatings has been studied for decades because of the potential of using such materials for laminar-flow control. Since boundary layers in most flows of engineering interest are three-dimensional the classic rotating-disk flow geometry, the paradigm for studying three-dimensional boundary layers, has been adapted to investigate flow over compliant rotating disks. This paper reviews the literature on the existing experimental and theoretical research on flow over compliant rotating disks. The article concludes by evaluating the status of the available results and their implications as regards future research routes to investigate the capabilities of compliant materials for laminar-flow control.

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“…A comprehensive review of such attempts can be found in [1], where most of researches dealt with 'soft' coatings (either a sponge material covered by a thin film or a gel-like substances). It is known that due to the fluid-solid interaction, such soft materials are subject to different instabilities resulting in surface folding and, hence, in drag increase.…”

Section: Introductionmentioning

confidence: 99%

Influence of the thickness of monolithic compliant coatings on the skin friction drag

2017

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Abstract. In this study, the drag reduction capabilities of compliant coatings made from viscoelastic silicon rubbers are verified experimentally. A series of single-layer compliant coatings of homogeneous materials with constant thicknesses were used. The experiments were performed at different flow velocities in a high-speed water tunnel of Pusan National University. They were accompanied by experimental determination of dynamic viscoelastic properties of the coating materials. Then, for each coating, a dynamic compliance in frequency domain was estimated. Assuming that the coatings interact effectively only with dynamic structures of turbulent boundary layer in a frequency band corresponding to the region about the maximum compliance, promising ranges of flow velocity and coating thickness are outlined. The predicted ranges are compared favourably with the experimental observations in the high-speed water tunnel.

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Compliant Coatings: A Decade of Progress

Cited by 56 publications

References 53 publications

On the Assumption of Laminar Flow in Physiological Flows: Cerebral Aneurysms as an Illustrative Example

On the Assumption of Laminar Flow in Physiological Flows: Cerebral Aneurysms as an Illustrative Example

Flow over compliant rotating disks

Influence of the thickness of monolithic compliant coatings on the skin friction drag

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