At 11:29 AM 3/11/2005 -0800, you wrote:
>Hi,
>
>I am interested to generate oscillating flow (with water)
>in a microchannel, anybody has anyidea of doing that
>for a range of frequnecies. thanks, Ali.

Googled on the terms:
fluidic-logic
fluidic-oscillators
fluidics
and came up with

http://www.dantecdynamics.com/applications/Aerospace/piv_Fluidic_actuator/In
dex.html

http://www.bowlesfluidics.com/products/index.html

You should be able to find something to start with.

--
Mark Fuller
Microelectronics Fabrication Facility
Washington State University