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1 CE 321 INTRODUCTION TO FLUID MECHANICS Fall 2009 LABORATORY 1: FLOW RATE MEASUREMENT OBJECTIVESS To measure flow rates To assess the uncertainty of the measured flow rates 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 and switch on the power. Open the flow control valve about ½ turn (Whenever the 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 prevent water from 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 several times to remove air trapped in the site gage tube that can cause measurement errors. 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
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2 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 while observing the system’s behavior. 6. Now repeat the drain-and-fill operation and measure the time required 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 this first set of data, as it is simply a trial.
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