In this experiment, the Hele Shaw apparatus was used to determine the potential flow of different shapes. These shapes included an aerofoil, a circle, a triangle, a water droplet and a rectangle placed in both a horizontal and vertical position. The potential flow of a source, sink and a doublet were also examined.
Demonstrating the use of the Hele Shaw apparatus was the main objective of this experiment and it was used to demonstrate the various potential flow fields of the different obstacles.
2. Literature review
A Hele Shaw apparatus is used to visualize the potential flow of a two dimensional shape. The apparatus produces a steady and laminar flow of streamlines. The apparatus consists of a channel which is formed between the two flat surfaces, one of which is a thick glass panel. The reason for the use of glass is to enable the user to view the streamlines for the shape being studied. Figure 1 below shows what a typical Hele Shaw looks like with the unobstructed streamlines. Figure 1: Hele Shaw apparatus 
One is able to see the streamlines present in figure 1 since there are no obstructions created by shapes, sinks or even sources. The streamlines are created by a red die which flows from the one side to the other.
Figure 2 shows the Hele Shaw apparatus that was used in this experiment and one can see the very feint lines of the streamlines which were produced. Figure 2: Hele Shaw apparatus used for this experiment
The Hele Shaw