- #1

nikokampman

- 2

- 0

dC

_{1}(z)/dt=D(d

^{2}C

_{1}(z)/dz

^{2})-v dC

_{1}(z)/dz + J1

and

dC

_{2}(z)/dt=D(d

^{2}C

_{1}(z)/dz

^{2})-v dC

_{2}(z)/dz + J2

where C is the concentration in the fluid, t = time, z = distance, v = velcity, D = dispersion coefficient, and J is a flux term for C to the fluid

I want to combine to yield

d(C

_{1}/C

_{2})/dt = ?

I can't work out the specific form of the chain rule or quotient rule I need to use... can anyone please help me? Be most appreciated!