changes.mady.by.user Arthur Aslanyan (Nafta College)
Saved on Mar 22, 2019
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p(t,r) = p_i + \frac{q_t}{4 \pi \sigma} \, F \bigg(ln - \frac{r^2r_e}{4 \chi t} \bigg)r_w}
p_{wf}(t) = p_i + \frac{q_t}{4 \pi \sigma} \, \bigg[ - 2S + F \bigg(ln - \frac{r_w^2e}{4 \chi t} \bigg)r_w} \bigg]
where
