Hydrodynamic drag

Hi All,

I am trying to simulate the hydrodynamic drag force on a particle of 8um suspended in a fluid which is flowing at a flow rate of 20uL/min through the micro-channel of 15umx15um entrance/exit cross-section. the length of the channel could be say 200 um.

I am interested in simulating the hydrodynamic drag force being inserted on a particle while flowing through that channel.. I have already made the geometry and added laminar flow physics and particle tracing but couldn't get the force.

Please have a look at the attached file and suggest.

Thanks, your suggestions would be helpful...