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S = \frac{p_{wf\rm ref}(t, r_w) - p_{\rm refwf}(t, r_w)}{ \left[ r \cdot \frac{\partial p_{\rm ref}}{\partial r} \right]_{r=r_w} } |
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S = \Big[ \frac{p_{wf\rm ref}(t, r_w) - - \frac{p_{\rm refwf}(t, r_w)}{ r_w } \Big] \Big/ { \left[ \frac{ \partial p_{\rm ref}}{\partial r} \right]_{r=r_w}} |
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p_{wf}(t) = - \frac{q_t}{2 \pi \sigma} \, S + p_{\rm ref}(t,r_w) |
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