Hi, I am new here and i hope my question's too. I am no expert at fluids mechanics and I hope you will help me. I 'd like to know how i can measure the velocity profile of a fluid in jets of 200µm of diameter.(laminar flow).We need it to observe radiactivity traces with a microscop. Thank you very much. joan

Why not try a hot wire, which will give you a point mesurment of high reloution. [simple & realtively cheap].