Standard

Flow visualization over drag reducing dimpled surfaces in turbulent boundary layers using Particle Image Velocimetry. / van Campenhout, Olaf; van Nesselrooij, Michiel; Veldhuis, Leo; van Oudheusden, Bas; Schrijer, Ferdinand.

Proceeedings of the 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics: Lisbon, Portugal. Springer, 2016.

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientific

Harvard

van Campenhout, O, van Nesselrooij, M, Veldhuis, L, van Oudheusden, B & Schrijer, F 2016, Flow visualization over drag reducing dimpled surfaces in turbulent boundary layers using Particle Image Velocimetry. in Proceeedings of the 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics: Lisbon, Portugal. Springer, 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics, Lisbon, Portugal, 4/07/16.

APA

van Campenhout, O., van Nesselrooij, M., Veldhuis, L., van Oudheusden, B., & Schrijer, F. (2016). Flow visualization over drag reducing dimpled surfaces in turbulent boundary layers using Particle Image Velocimetry. In Proceeedings of the 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics: Lisbon, Portugal Springer.

Vancouver

van Campenhout O, van Nesselrooij M, Veldhuis L, van Oudheusden B, Schrijer F. Flow visualization over drag reducing dimpled surfaces in turbulent boundary layers using Particle Image Velocimetry. In Proceeedings of the 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics: Lisbon, Portugal. Springer. 2016

Author

van Campenhout, Olaf ; van Nesselrooij, Michiel ; Veldhuis, Leo ; van Oudheusden, Bas ; Schrijer, Ferdinand. / Flow visualization over drag reducing dimpled surfaces in turbulent boundary layers using Particle Image Velocimetry. Proceeedings of the 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics: Lisbon, Portugal. Springer, 2016.

BibTeX

@inproceedings{0cb5c9625ef14b52bbc3e6e4da665e22,
title = "Flow visualization over drag reducing dimpled surfaces in turbulent boundary layers using Particle Image Velocimetry",
abstract = "Although various experimental studies have confirmed a potential drag reduction of dimpled surfaces in turbulent boundary layers, the working mechanism behind the effect remains largely unresolved. The goal of this experimental study is to reveal the flow structures that could explain this drag reduction. To this end, flow visualizations over drag reducing dimpled surfaces are performed, using planar and stereoscopic Particle Image Velocimetry (PIV). The PIV measurements show that there is no significant vortex generation in the present dimples, but that instead a converger-diffuser type of flow occurs. It can be therefore concluded that it is not the generation of vortices which causes the drag reduction, in contrast to what has been proposed in literature. Based on the present measurements, a new drag reducing mechanism is proposed: the interaction between dimples causes alternating spanwise excitations of the near-wall flow which interacts with the turbulent coherent structures and leads to a reduction of the turbulent drag.",
keywords = "Passive flow control, drag reduction, PIV, turbulent boundary layers",
author = "{van Campenhout}, Olaf and {van Nesselrooij}, Michiel and Leo Veldhuis and {van Oudheusden}, Bas and Ferdinand Schrijer",
year = "2016",
language = "English",
booktitle = "Proceeedings of the 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics",
publisher = "Springer",
note = "18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics ; Conference date: 04-07-2016 Through 07-07-2016",
url = "http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2016/",

}

RIS

TY - GEN

T1 - Flow visualization over drag reducing dimpled surfaces in turbulent boundary layers using Particle Image Velocimetry

AU - van Campenhout, Olaf

AU - van Nesselrooij, Michiel

AU - Veldhuis, Leo

AU - van Oudheusden, Bas

AU - Schrijer, Ferdinand

N1 - Conference code: 18

PY - 2016

Y1 - 2016

N2 - Although various experimental studies have confirmed a potential drag reduction of dimpled surfaces in turbulent boundary layers, the working mechanism behind the effect remains largely unresolved. The goal of this experimental study is to reveal the flow structures that could explain this drag reduction. To this end, flow visualizations over drag reducing dimpled surfaces are performed, using planar and stereoscopic Particle Image Velocimetry (PIV). The PIV measurements show that there is no significant vortex generation in the present dimples, but that instead a converger-diffuser type of flow occurs. It can be therefore concluded that it is not the generation of vortices which causes the drag reduction, in contrast to what has been proposed in literature. Based on the present measurements, a new drag reducing mechanism is proposed: the interaction between dimples causes alternating spanwise excitations of the near-wall flow which interacts with the turbulent coherent structures and leads to a reduction of the turbulent drag.

AB - Although various experimental studies have confirmed a potential drag reduction of dimpled surfaces in turbulent boundary layers, the working mechanism behind the effect remains largely unresolved. The goal of this experimental study is to reveal the flow structures that could explain this drag reduction. To this end, flow visualizations over drag reducing dimpled surfaces are performed, using planar and stereoscopic Particle Image Velocimetry (PIV). The PIV measurements show that there is no significant vortex generation in the present dimples, but that instead a converger-diffuser type of flow occurs. It can be therefore concluded that it is not the generation of vortices which causes the drag reduction, in contrast to what has been proposed in literature. Based on the present measurements, a new drag reducing mechanism is proposed: the interaction between dimples causes alternating spanwise excitations of the near-wall flow which interacts with the turbulent coherent structures and leads to a reduction of the turbulent drag.

KW - Passive flow control

KW - drag reduction

KW - PIV, turbulent boundary layers

UR - http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2016/finalworks2016/papers/01.11_4_92paper.pdf

UR - http://resolver.tudelft.nl/uuid:0cb5c962-5ef1-4b52-bbc3-e6e4da665e22

UR - https://www.dropbox.com/s/q2x087lh1v77ft7/Proceedings_LxSymp2016.pdf?dl=0

M3 - Conference contribution

BT - Proceeedings of the 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics

PB - Springer

T2 - 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics

Y2 - 4 July 2016 through 7 July 2016

ER -

ID: 27857055