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Multiple Intergradation
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In a Technical Standard I was reading I was presented with the integration formula below.

https://preview.redd.it/upavmkh8w7tc1.png?width=919&format=png&auto=webp&s=c59426f7bcb19a1cc7fe244e4bc1eb5efd811cd0

I have a value for Q which is a constant - (flow rate of liquid), A is the Area of a circle with a central circle removed (Like a 2d bagel or donut).fmr, Pth & Vm all vary with r which is the radius from the centre of the circle.I have the values for all 3 of these as 3rd Order Polynomials.

I do not understand how to work out what the Pm Value is. Can anyone explain to me how to go about this?

Thanks

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7 months ago