changes.mady.by.user Arthur Aslanyan (Nafta College)
Saved on Mar 23, 2019
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p(r) = p_i + \frac{q_t}{2 \pi \sigma} \, \ln \frac{r}{r_e} = p_{wf} -+ \frac{q_t}{2 \pi \sigma} \, \ln \frac{r}{r_w}
p_{wf} = p_i - \frac{q_t}{2 \pi \sigma} \, \bigg[ S + \ln \frac{r_e}{r_w} \bigg]
r_{wf} \leq r \leq r_e
