Hi,
I am running some microPIV expts in a channel, the dimensions of which are
50mm * 2.5mm* 45um. There ends up being a lot of bubble formation in the
channel and I was advised to use some surfactant like Tween 20. I bought a
bottle of that. But it doesn't come with any guidelines and to how much
should be added. I would appreciate if you could tell me some number as a
safe starting point.

The flow tracers that I use are carboxylated polystyrene beads in nanopure
water.

Best Regards,
Vishwa