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

[g9WfI]

Homework Statement

N/A

Relevant Equations

See below

I investigated the flow rate of differing dilutions of glycerol through an orifice of a vertical tube and obtained the following:

I'm looking for a way to quantify these results so looked to Poiseuille's Law;

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?

 

[haruspex]

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.

 

[g9WfI]

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 :)