Abstract
As a viscous fluid drains from the bottom of a wide-mouthed reservoir through a narrow vertical tube, the symmetric flow within the tube, known as Poiseuille flow, is quickly established. Since the pressure provided by the fluid in the reservoir changes slowly in time, the flow is quasistatically time dependent. Our theoretical model of this process relates the time dependence of the height of the fluid in the reservoir to the dimensions of the tube and the kinetic viscosity of the fluid. We construct an apparatus from inexpensive and easily procured materials (plastic containers, steel straws, glue, adhesive putty, and a supply of pure glycerin) in order to test our model and find good agreement between the theory and the experiment.
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