Substances flowing out of container

[tercula]

Homework Statement

I have to do an experiment for my english class:
I have to use two or more containers of same size and shape and punch holes in the bottoms of these containers. The holes should vary in size and number for the different containers. Then I have to fill the containers with water, sugar and flour and measure how long it takes for different substances to flow out of the container

Homework Equations

Since I am German I have the problem that I am not really sure about the english terms and leo.org is not helping alot...
1.) What scientific principles do I have to consider?
2.) It is pretty easy to find something about hydromechanics, but what about the solid materials?

The Attempt at a Solution

1.)
flow rate
density of the material
diameter of the holes
number of holes
velocity
2.) I would use kinetic principles

 

[BigJDubs]

for the solid materials. I think there are differences between the flow rates of solid and liquid materials, so I would try to find out more about that. Maybe also surface tension could be relevant.

 

[baba89]

to understand the flow of solid materials. This involves considering the forces acting on the particles, their mass and velocity, and the properties of the material itself (such as density and viscosity). Additionally, I would also consider the size and shape of the particles, as this can affect their ability to flow through the holes. Other factors to consider may include the surface tension and adhesion of the material, as well as any external forces or obstructions that could affect the flow.