Page History

r_{wf} < r \leq r_e

\frac{\partial p}{\partial t}  = \chi \, \left( \frac{\partial^2 p}{\partial r^2} + \frac{1}{r} \frac{\partial p}{\partial r} \right)

p(t = 0, {\bf r}) = p_i

\left[ a \cdot ( p(t, r \rightarrow r_e ) -= p_i)

\left[ r\frac{\partial p(t, r )}{\partial r} \right]_{r \rightarrow r_w} = \frac{q_t}{2 \pi \sigma}

p_{wf}(t)= p(t,r_w) - S \cdot r_w \, \frac{\partial p}{\partial r} \Bigg|_{r=r_w}