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First, a control experiment, using water, was performed to allow us to see normal pressure readings without any clog being present. These pressure readings will serve as a basis for comparison when we begin to run alum through our system. The pressure results from pressure sensor 1 can be seen in the following graph.
Graph 1: Pressure readings for the control experiment using water
Next, alum was used in order to determine the time it would take for a clog to form in our .1 cm orifice. The experiment was run for four day days but the most conclusive data was seen within the first hours. The pressure readings which from pressure sensor 1, as seen in from Figure 1, are shown in the Graph 2 below.
Graph 2: Pressure sensor 1 readings using alum
The first experiment using an alum solution ran continuously for four days. From the data, a 1 cm change in pressure was observed about 2.4 hours after the experiment began. Other fluctuations in pressure were observed throughout the remaining time, but they were deemed negligible. The blip seem in day four is a result of flow rate measurements made by the team.
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