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## Main Question or Discussion Point

Hello! My book (fluid mechanics by White) doesn't explain the formulas it uses for finding geometric information about a potential field. For instance, sometimes if a stream-function is kept constant it, will form a figure like the one in this picture.

https://scontent-b-lhr.xx.fbcdn.net/hphotos-ash3/1379638_10201611755512363_1918244517_n.jpg

Its stream-function: ##\psi = U_{\infty} r \sin(\theta) + m(\theta_1 - \theta_2) ## (8.34), where ##\theta_1## and ##\theta_2## are the angles relative to the source and sink.

What is the general way of thinking for extracting information (like in this case, L and h) about the geometries of potential-functions? Why is L and h that weird formula in 8.35, in this case?

PS: Sorry for flooding this forum with so many questions, lately. I'll make up for it in a few years when I'm done with my studies.

https://scontent-b-lhr.xx.fbcdn.net/hphotos-ash3/1379638_10201611755512363_1918244517_n.jpg

Its stream-function: ##\psi = U_{\infty} r \sin(\theta) + m(\theta_1 - \theta_2) ## (8.34), where ##\theta_1## and ##\theta_2## are the angles relative to the source and sink.

What is the general way of thinking for extracting information (like in this case, L and h) about the geometries of potential-functions? Why is L and h that weird formula in 8.35, in this case?

PS: Sorry for flooding this forum with so many questions, lately. I'll make up for it in a few years when I'm done with my studies.

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