experiment1 - METU Chem Eng Dept Ch.E 320 Chem Eng Lab I...

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METU Chem. Eng. Dept. Ch.E. 320 Chem. Eng. Lab I EXPERIMENT 1 FLOWMETERS AND PRESSURE DROP FOR A FLOW SYSTEM 1/4 OBJECTIVES At the end of this experiment you should be able to: Compare working principles of and calibrate a flow nozzle, an orificemeter, a pitot tube and a rotameter. Evaluate flow rate dependence of pressure drop along a rough pipe. Predict Reynold’s Number dependence of friction factor (f) in pipe flow. PRELIMINARY WORK 1. Study the principles of flowmeters and flow regimes in pipes. 2. Familiarize yourself with the equipment. 3. Prepare a data sheet to be used during the experiment. 4. Answer the following questions in your laboratory notebook.: a. What is an orificemeter? b. Derive the basic equation of an orifice meter and state all assumptions involved in this derivation c. How can you calibrate an orificemeter? d. Derive the basic equation of a pitot tube. e. Compare the operational principles of a pitot tube with an orificemeter. f. Describe the operation principle of a rotameter. g. Define drag coefficient and write down a force balance over a rotameter float. h. Define fanning friction factor. i. Derive pressure drop equations in a pipe for laminar and turbulent flows.
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