Effects of rectangular microchannel aspect ratio on laminar friction constant

Ian Papautsky; Bruce K. Gale; Swomitra K. Mohanty; Timothy A. Ameel; A. Bruno Frazier

doi:10.1117/12.359332

19 August 1999 Effects of rectangular microchannel aspect ratio on laminar friction constant

Ian Papautsky, Bruce K. Gale, Swomitra K. Mohanty, Timothy A. Ameel, A. Bruno Frazier

Proceedings Volume 3877, Microfluidic Devices and Systems II; (1999) https://doi.org/10.1117/12.359332
Event: Symposium on Micromachining and Microfabrication, 1999, Santa Clara, CA, United States

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.

Citation Download Citation

Ian Papautsky, Bruce K. Gale, Swomitra K. Mohanty, Timothy A. Ameel, and A. Bruno Frazier "Effects of rectangular microchannel aspect ratio on laminar friction constant", Proc. SPIE 3877, Microfluidic Devices and Systems II, (19 August 1999); https://doi.org/10.1117/12.359332

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