Proving Bernoulli's Equation at Home(2)

Tools: Hairdryer, Stool, Sheet of Paper, Tape


Introduction:
As mentioned in the previous experiment, Bernoulli's Equation is used to predict real fluids such as air.
I performed one more experiments to help the reader fully understand the concept of Bernoulli's Equation.

Experiment 1: Hairdryer and a Sheep of Paper
Procedure:
1. Attach a sheet of paper on a stool.

2. Turn the hairdryer on and put it above the stool pointing the paper.

3. Observe the temporary stable position of the paper.

Discussion: According to the last experiment, Bernoulli's equation told us that when the velocity increases, pressure decreases.
Before using the hairdryer, the paper was bended downward due to gravity.
By blowing the air paralel to the seat of the stool, the sheet of paper moved upward.
This sequence indicates that the wind worked as a resisting force of gravity.
On step 3, the paper was fixed at a specific position, which indicates the balance of force between the wind and gravity.
The upward force which lifted the paper was cuased by the pressure difference between the two different sides of the sheet of paper.
Furthermore, the presure difference was caused by the flow of the fluid.
Since there was a flow from the hairdryer on the upper side of the paper, there was no flow under the sheet of paper.