Microflow-based control of near-wall fluctuations for large viscous drag reduction

Journal article


Publication Details

Author(s): Jovanovic J, Srikantharajah R, Lienhart H, Delgado A, Frohnapfel B, Jovanović D
Journal: Microfluidics and Nanofluidics
Publisher: Springer Verlag (Germany)
Publication year: 2011
Volume: 11
Journal issue: 6
Pages range: 773-780
ISSN: 1613-4982
Language: English


Abstract


The stabilizing effect of microgroove surface morphology on viscous drag reduction was studied experimentally in the inlet region of a plane channel flow. The stabilization is thought to be due to the ability of a microgrooved surface pattern to suppress the velocity fluctuations in the spanwise direction on a restricted portion of the wetted surface, which prevents vorticity development at the wall and consequently across the entire flow field. This smart microflow control strategy, which works successfully only under very particular circumstances, was implemented in a microgroove-modified channel flow in which the front part has a microgrooved surface topology. The results of pressure drop measurements indicate that microgrooved surfaces can effectively stabilize laminar boundary layer development, leading to a significant reduction in the viscous drag. In the rear flat part of the microgroove-modified channel test section, a maximum drag reduction of DR ≃ 35% was measured. This corresponds to an overall drag reduction of DR ≃ 16% at a length Reynolds number of Re x ≃ 10 6: The drag reduction effect persisted in a narrow range of flow velocities and for the reported experimental conditions corresponds to microgroove dimensions between 1.5 and 2.5 viscous length-scales. © Springer-Verlag 2011.



FAU Authors / FAU Editors

Delgado, Antonio Prof. Dr.-Ing.
Lehrstuhl für Strömungsmechanik
Jovanovic, Jovan Prof. Dr.
Lehrstuhl für Strömungsmechanik
Lienhart, Hermann
Lehrstuhl für Strömungsmechanik
Srikantharajah, Rubitha
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik


Additional Organisation
Exzellenz-Cluster Engineering of Advanced Materials


Research Fields

D Catalytic Materials
Exzellenz-Cluster Engineering of Advanced Materials
A3 Multiscale Modeling and Simulation
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Jovanovic, J., Srikantharajah, R., Lienhart, H., Delgado, A., Frohnapfel, B., & Jovanović, D. (2011). Microflow-based control of near-wall fluctuations for large viscous drag reduction. Microfluidics and Nanofluidics, 11(6), 773-780. https://dx.doi.org/10.1007/s10404-011-0842-1

MLA:
Jovanovic, Jovan, et al. "Microflow-based control of near-wall fluctuations for large viscous drag reduction." Microfluidics and Nanofluidics 11.6 (2011): 773-780.

BibTeX: 

Last updated on 2018-08-08 at 03:43