Recent content by jencam

OK, I see now, and appreciate the difficulties solving the general case. I wish I had more experience with partial differential equations... I'll look into the Peclet number but I think just estimating the distance to fall from e.g. 90 to 10% concentration (or whatever I am interested in) as in...

I understand neither solution is complete and simpliying assumptions have been made in both cases. I don't see which of the assumptions that causes the elongation of the slope to (-infinity,+infinity) instead of (0,u0). If there were axial diffusion I would understand. I did the experiment with...

Hi I am reading and trying to comprehend the article "Dispersion of soluble matter in solvent flowing slowly through a tube", Sir Geoffrey Taylor, Proceedings of the Royal Society of London, 1953. I am particularly interested in cases A2 and B2, where a concentrated solution is injected...

Hi Andy. Thanks for your response. Poiseuilles law is what I use for water-water flow. Works quite well and the paraboloid velocity profile will in effect give a linear decrease in "concentration" (I know the fluids are not mixed in laminar flow but for me the effect is the same). The...

Hi I am working in an application where we pump a fluid in a water -filled tube, where the second fluid has a viscosity of 3-4 times the viscosity of water. We have laminar flow (Re around 20). If the fluids were 100% compatible (e.g. colored water vs clear water) I have determined that...