Fluid flow rate lab- with analysis

[poofa93]

Homework Statement

Problem statement: We are measuring the flow rates of liquids of different viscosities through holes of varying sizes. We ultimately want to observe the relationship between the viscosity and the flow rate, and also between the diameter and the flow rate.

Variables:
Independent- different liquids (different viscosities); diameter of hole
Dependent- flow rate

Homework Equations

Flow rate = ΔV/Δt

The Attempt at a Solution

We need for all of our variables to be of quantitative nature but at the moment, we cannot measure the viscosity of our liquids.

My main question is if I should try to graph the density of my liquids against the flow rate as opposed to the viscosity (since the density is something I can easily measure)? I am worried that this approach will lead to data upon which no conclusion can be drawn since the density of a liquid does not determine its viscosity.

Basically I am hoping that there is an equation I can use that uses the flow rate and density of a liquid to calculate its viscosity. Is there such an equation?

 

[member 553083]

The answer is yes, there is an equation that relates density and viscosity. It is the Andrade equation, which states:η = Aρ^nwhere η is viscosity, ρ is density, A is a constant, and n is a power factor.