Introductory Fluid Mechanics L13 p2 - Flowrate Between Streamlines

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Thank you for the video ! helps a lot !
my small contribution: it is rather the volume flow per unit of width that we find
width in the direction of z

lounesbenali
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this videos are amazing, thank you very much.

AcademiaPatas
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At 7:00 is there not an extra negative there? I expected the integral of -d(psi) = -[psi2 - psi1] ... but this would break the explanation though, where am I making a mistake? Thanks!

TimJim
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@Ron Hugo, why is the volume flow rate(Q) across AB equal to u dy and not v dx.

zappypants
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I dont undestand why is he evaluating Q(BC) between x1 and x2 instead of x2 and x3?
Please help me if I am wrong.

diyachudasama
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I’m getting a bit mixed up with variables. What does dr represent again?

finianholland