Does Poiseuille's Law apply for vertical motion of fluids down a tube?

AI Thread Summary
The discussion revolves around the application of Poiseuille's Law to the flow rate of glycerol dilutions through a vertical tube. The original poster questioned whether their graph demonstrated an inverse proportion as expected by the law and sought clarification on the relationship between viscosity and glycerol concentration. They received suggestions to explore viscosity calculations to better understand the flow behavior. After making adjustments, the poster reported an improved graph, indicating progress in their investigation. The conversation highlights the complexities of fluid dynamics in vertical motion and the relevance of viscosity in these scenarios.
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I investigated the flow rate of differing dilutions of glycerol through an orifice of a vertical tube and obtained the following:
1625006338200.png

I'm looking for a way to quantify these results so looked to Poiseuille's Law;
Screenshot 2021-06-29 at 23.40.27.png

I'm pretty sure my graph does not show inverse proportion? Could anyone advise me as to where I've gone wrong / if there is another law governing this relationship - does Poiseuille's Law apply for the vertical motion of fluids?
 
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haruspex said:
What makes you think the viscosity will be proportional to the fraction that's glycerol?
See if http://www.met.reading.ac.uk/~sws04cdw/viscosity_calc.html helps.
I see. I've got a much better looking graph now. Thanks a lot :)
 

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