Frictional drag reduction in microchannel using slip on convex air bubbles naturally formed in a specifed a cavity

Author

Kwon, B.H. ; Kim, H.H. ; Park, K. ; Park, J.H. ; Choi, D.G. ; Go, J.S.

Author_Institution

Sch. of Mech. Eng., Pusan Nat. Univ., Busan, South Korea

fYear

2011

fDate

5-9 June 2011

Firstpage

1288

Lastpage

1291

Abstract

This paper presents the reduction of frictional drag by using the slip on the interface of convex air bubble. The visualization shows that the convex bubbles formed naturally in the hydrophobic cavity array positioned along a microchannel with time. The size of the bubbles depended on the size of the cavity size. The velocity distribution was also displayed by using a micro-PIV measurement. Then, the volume flow rate and the momentum were examined by increasing inlet flow rate for the different sizes of microbubble. The maximum reduction of frictional drag of 52% was obtained.

Keywords

bubbles; drag reduction; microchannel flow; slip; frictional drag reduction; hydrophobic cavity array; microchannel; slip on convex air bubbles; velocity distribution; volume flow rate; Arrays; Cavity resonators; Fluid flow measurement; Fluids; Microchannel; Velocity measurement; Cavity; Drag; Microbubble; Momentum; PIV; Slip;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Sensors, Actuators and Microsystems Conference (TRANSDUCERS), 2011 16th International

Conference_Location

Beijing

ISSN

Pending

Print_ISBN

978-1-4577-0157-3

Type

conf

DOI

10.1109/TRANSDUCERS.2011.5969422

Filename

5969422