Plot – Graph a function for different parameter values

I have a function:

you[r_] : = 1/2 * (uj + u∞) -
1/2 * (uj - u∞) * Tanh[1/4*Rθ*(r/R - R/r)]

Where:

uj = 1;
u∞ = 0;
R = 1;

I want to trace:

Plot[(u[r/R] - u∞) / (uj - u∞), {r, 0, 3},
PlotRange -> All]

But for three different values ​​of parameters , something like that:

Plot[(u[r/R] - u∞) / (uj - u∞), {r, 0, 3},
PlotRange -> All]/. {Rθ-> 10, Rθ-> 5, Rθ-> 2.5}

How to do that?