June 15, 2019
June 15, 2019
October 19, 2019
The coefficient of discharge is an important concept in fluid mechanics. This paper describes a simple and inexpensive experiment to determine the discharge coefficients for nozzles consisting of straight holes and counter-bored holes. The apparatus consists of a straight vertical PVC tube with different nozzles attached at the bottom. The cost of each setup is less than $30 where the cost of the graduated cylinders used to measure the amount of water flowing through the nozzles accounts for half of that cost. If graduated cylinders are already available, the cost per setup is about $15. The tubes are filled with water to generate flow through the nozzles. Varying length tubes are used to vary the head pressure. Only two measurements are required: the volume of water collected and the amount of time it takes to collect the water. It is recommended that at least two students conduct the lab. One continuously fills the tube with water and controls the stopwatch. The second student holds the tube and blocks the nozzle outlet until it is time to start. An apparatus could be made to hold the tube and block the outlet if desired so it could be done by a single student if desired. This experiment can be used as a fluid flow demonstration or as a laboratory. There are numerous possible variations of this experiment including multiple combinations of straight and counter-bored holes, contoured holes, different tube lengths, and different liquids. Example results are reported in the paper where the experiment has been used as a lab. The equations used to develop the theory are provided. Possible sources of error are also discussed.
Baukal, C. E., & Bussman, W. R. (2019, June), Discharge Coefficient Experiment Paper presented at 2019 ASEE Annual Conference & Exposition , Tampa, Florida. 10.18260/1-2--32667
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