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I need to determine the size of the tube having the flow rate of the liquid (water) which is 5 ml/min and assuming the diameter of the tube is 4mm. How can i determine the size of the tube that takes approx one minute for 5ml water to flow along the tube?

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  • $\begingroup$ There's a few ways to figure this out, depending on what exactly it is you care about. Is this a practical problem or a homework problem? $\endgroup$ Jun 14 '20 at 14:38
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If the flow rate is 5ml/min, and you want to know how long a tube it will take 1 min to pass through, you’re effectively asking how long a tube contains 5ml.

Volume of a cylinder is $\pi*r^2*h$.

5ml = 5000mm^3.

Pi*r^2 = Pi*2mm^2 = 4pi mm^2

Your length therefore is 5000/4pi or around 400mm.

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