Vishwa,

Check out this paper for some filling techniques:

"A Method for Filling Complex Polymeric Microfluidic Devices and
Arrays"
Monahan, Gewirth, Nuzzo
Analytical Chemistry, Vol. 73, No. 13, July 1, 2001
p.3193-3197

Best,

Kevin

-------------------------
Kevin V. Christ
Turner Research Group, http://ktgroup.me.wisc.edu
Department of Mechanical Engineering
University of Wisconsin, Madison
-------------------------

----- Original Message -----
From: Vishwa 
Date: Thursday, October 12, 2006 12:35 pm
Subject: [mems-talk] Bubble formation in mircochannels.
To: [email protected]

> Hi guys,
> I have been facing this problem of bubble formation in my
> microchannel. The
> dimensions of the channel are 2.5mm across, 5cm long and 60
> microns tall.
> The channel has some ridges on the floor and the bubble seem to
> collect in
> the channel. I try to clear the bubbles by tapping the channel
> gently from
> the top, but with not much luck. The channel is made of PDMS and I
> plasmabond a glass slide to form one wall. The reynolds number
> that I work with
> are very very low, on the order of 1. I used fluorescent
> microspheres in
> water as the solution to pass thru the channel to take some images to
> process them and obtain velocity fields. The water I use is
> Nonopure water.
> Any help with this will be greatly appreciated.