Flow characteristics of hydrophilic/hydrophobic capillaries considering surface tension

Author

Lee, Y. ; Kim, J.K. ; Chung, S. ; Chung, C. ; Chang, J.K. ; Yoo, J.Y.

Author_Institution

Sch. of Mech. & Aerosp. Eng., Seoul Nat. Univ., South Korea

fYear

2002

fDate

6/24/1905 12:00:00 AM

Firstpage

560

Lastpage

564

Abstract

The surface tension driven flow characteristics should be considered for the initial priming of microfluidic chips with the hydrophilic or hydrophobic surfaces. The hydrophobic capillaries have been prepared by exposing the hydrophilic glass capillaries to pure hexadecane and an octadecyltrichlorosilane (OTS) solution. The displacements and velocities of fluid menisci in two kinds of tubes are measured while changing the inlet pressures. Numerical solutions of fluidic equation show a comparable agreement with experimental results when considering the surface tension. It is also shown that partially coated hydrophobic region of capillary could be used as a passive valve

Keywords

Poiseuille flow; biological techniques; capillarity; channel flow; computational fluid dynamics; microfluidics; microvalves; surface tension; ABO blood typing; Newtonian dynamics equation; Poiseuille flow profile; fluid menisci; hydrophilic capillaries; hydrophobic capillaries; initial priming; microfluidic chips; nonlinear differential equations; octadecyltrichlorosilane solution; partially coated hydrophobic region; passive valve; pure hexadecane; surface tension driven flow characteristics; surface wettability; Aerospace engineering; Biology; Computer science; Equations; Microfluidics; Microhydro power; Reservoirs; Surface tension; Temperature; Valves;

fLanguage

English

Publisher

ieee

Conference_Titel

Microtechnologies in Medicine & Biology 2nd Annual International IEEE-EMB Special Topic Conference on

Conference_Location

Madison, WI

Print_ISBN

0-7803-7480-0

Type

conf

DOI

10.1109/MMB.2002.1002412

Filename

1002412