What is the flow rate through a capillary tube?

AI Thread Summary
The discussion centers on finding an equation for the flow rate through a capillary tube, specifically for straight vertical or angled tubes. The original poster seeks to determine the time it takes for liquid to rise to its maximum height, acknowledging that the flow rate is not steady. A suggestion is made to use the Hagen-Poiseuille equation, with modifications to account for hydrostatic pressure effects. The complexity of the problem is highlighted, indicating that it may not have a straightforward solution. Understanding these dynamics is essential for accurate calculations in fluid mechanics.
ratzmoose
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Hi,

I was wondering if there was an equation for the flow rate through a straight vertical or angled capillary tube. All I can find is how to calculate the height it rises but I would like to know how to find the rate it rises. I imagine it is not a steady rate since it must stop once it reaches it's max height however just to be able to get the time it would take to get to that point should suffice for what I am doing.

Any help would be greatly appreciated.

Thanks
 
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Check out the Hagen Poiseuille equation. This equation would have to be modified to include hydrostatic pressure effects.

Chet
 

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