microscale modeling using control volume
 

Hello
I am using Control Volume finite difference method to model a micro scale solidification problem that includes heat transfer and mass transfer equations.

I am using a staggered grid so I am solving the eqns from node 2 to n-1 .

I am struggling to give the boundary conditions in staggered grid:
I have a zero flux condition and a fix temperature or concentartion conditon at the other end. Can some one help me to how to include this in my code.

Thanks