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Proceedings Paper

Effects of rectangular microchannel aspect ratio on laminar friction constant
Author(s): Ian Papautsky; Bruce K. Gale; Swomitra K. Mohanty; Timothy A. Ameel; A. Bruno Frazier
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Paper Abstract

In this paper, the effects of rectangular microchannel aspect ratio on laminar friction constant are described. The behavior of fluids was studied using surface micromachined rectangular metallic pipette arrays. Each array consisted of 5 or 7 pipettes with widths varying from 150 micrometers to 600 micrometers and heights ranging from 22.71 micrometers to 26.35 micrometers . A downstream port for static pressure measurement was used to eliminate entrance effects. A controllable syringe pump was used to provide flow while a differential pressure transducer was used to record the pressure drop. The experimental data obtained for water for flows at Reynolds numbers below 10 showed an approximate 20% increase in the friction constant for a specified driving potential when compared to macroscale predictions from the classical Navier-Stokes theory. When the experimental data are studied as a function of aspect ratio, a 20% increase in the friction constant is evident at low aspect ratios. A similar increase is shown by the currently available experimental data for low Reynolds number (< 100) flows of water.

Paper Details

Date Published: 19 August 1999
PDF: 12 pages
Proc. SPIE 3877, Microfluidic Devices and Systems II, (19 August 1999); doi: 10.1117/12.359332
Show Author Affiliations
Ian Papautsky, Univ. of Utah (United States)
Bruce K. Gale, Louisiana Tech Univ. (United States)
Swomitra K. Mohanty, Univ. of Utah (United States)
Timothy A. Ameel, Univ. of Utah (United States)
A. Bruno Frazier, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 3877:
Microfluidic Devices and Systems II
Chong Hyuk Ahn; A. Bruno Frazier, Editor(s)

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