Recent content by anni

Hi, Is there anybody who knows about this subject and can guide kindly? Regards, In electron beam lithography, there is an optimum aperture angle to obtain a minimum beam size: a) Determine this angle considering only the influence of the source and spherical aberrations. b) What is the...

Hi I have a question. I don't know from which formula I can get the answer. I'm looking for in different books and papers but I did not find. I'm very appreciate if someone kindly guide. Regards, For an X-ray mask, what should the thicknesses of the silicon membrane and absorbers (gold or...

I solved the problem again but I don't know what should I do for next step.

In real system it is not steady state and it is turbulent. But I can solve it simply, I suppose that it is laminar and steady state.

Thank you so much for your explanations. So, what Bcs should I specified to obtain correct result?

I am not if I understood what you mean. Do you mean the equation and my BCs are correct?

I supposed that where the contaminant is pouring in the river is X=0 and Z=0

Today I solved them in another way. I suppose that Vz=Vz, max and solved the equation. But now the obtained results were completely different with Comsol simulation. I don't know where is my problem.

Thank you so much for your reply. are the boundary conditions correct or not?

Thank you so much for your reply. I try to obtain mass transfer of contaminants in a river. I suppose that my problem is laminar flow and I don't have reaction. I suppose that (A= contaminate particles, B=water) X= depth, Z= length and Y= width of river Boundary conditions: at x=0 , Z=0 CA=CA0...

Thank you for comment. Here is screen shots:

Thank you for comment

Hello everyone, I would like to obtain the equation for mass transfer of contaminant in a river. Here the fluid flow is laminar and I don't have reaction. I solved it and obtained this equation, but I think this equation is wrong because when I solved it numerically I got wrong answers. Would...