Lab2Revised for 2004 - CE 321 INTRODUCTION TO FLUID...

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CE 321 INTRODUCTION TO FLUID MECHANICS 2004 LABORATORY 2: FLOW RATE MEASUREMENT Objectives: To measure flow rates, to assess the uncertainty of the measured flow rates, and to determine how to make accurate flow rate measurements. Equipment: Hydraulic bench, wrist watch, and stopwatch. Approach: In this lab you will learn to “measure” flow and assess the uncertainty of the measured values. We have intentionally selected a method that produces significant uncertainty at times. Once you understand the sources of this uncertainty, you can refine the measurement procedure to obtain accurate flow rate measurements in later labs. Procedure: A. Familiarize yourself with the equipment. 1. Open the dump valve. Switch on the power. Open the flow control valve about ½ turn. (Whenever power is on, the valve should be open so that some water flows through the system. Otherwise the pump will overheat) 2. Adjust the valve so that maximum flow occurs (open valve slowly to pre- vent water shooting around the lab). 3. Trace out the path of water starting at the sump tank. 4. Before making any measurements, fill the measuring tank to the top sev- eral times to remove air trapped in the site gage tube that can cause measurement errors and make sure that the dump valve seals when it is closed. This should be done at the beginning of each lab period in which you measure flow. Before filling the measuring tank ensure that the sump contains adequate water, so that the pump does not run dry. 5. Close the dump valve and watch the water level in the site gage rise as water accumulates in the measuring tank. Open the dump valve once the water level in upper site gage reaches 5 liters. Drain the tank completely and fill it to 5 liters several more times simply observing the system’s be- havior. 6. Now repeat the drain-and-fill operation and try measuring the time re- quired to accumulate 5 liters of water; start timing when the bottom of the meniscus 1 in the site gage reaches the 0 liter mark and stop when it reaches the 5-liter mark. Do not bother recording these data. Now you are ready to begin collecting data. 1 Meniscus-the U-shaped upper surface of the water in the site gage. Start timing when the bottom of the meniscus is aligned with the zero mark.
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