I inject a pulse of two different particle sizes, 100nm and 20nm diameters, into a cylindrical capillary tube at t=0 and z=0, so that they are completely intermingled, with no concentration gradient in the radial direction (thus, c20nmc100nm=1 ). Within this "pulse" the concentration of each of the particles are equal. Assume the particles behave as ideal spheres in a dilute system. The tube's radius is R0=1cm and the average fluid velocity in the tube is v0=2cm/s. The fluid is water with density =1g/cm3 and viscosity =0.01gcm1s1. Questions: a) At z=0.5m, will the particles still be completely mixed together? That is, will c20mc100nm=1 continue? b) If they do separate, what will be the ratio of the two size particles' maximum concentrations at z=0.5m