ME 130L Lab_5 Fall 2010

ME 130L Lab_5 Fall 2010 - ME 130L 17910 17975 The...

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ME 130L 17910 – 17975 The University of Texas at Austin Mechanical Engineering Department Fall ’10 Dr. Hidrovo 1 ME 130L Experimental Fluid Mechanics Lab #5 - Flow in Pipes I. Objectives The objectives of this lab are to: 1. Using dye flow visualization, observe transition from laminar to fully turbulent flow in a pipe and experimentally define the conditions for transition. 2. Measure pressure drop in a pipe and express in dimensionless form via the friction factor. 3. Correlate measured friction factor with Reynolds number and compare to published data. II. Background Piping systems (like the Trans-Alaska Pipeline in Figure 1 and Figure 2) are vital for countless real world applications. Flow and pressure drop in piping systems is one of the most important practical applications of fluid mechanics in Mechanical Engineering. "Head losses" must be made up by a pump or blower. The engineer must specify what size pump or blower is needed for a given flow rate. Thus losses must be predicted with some accuracy. In this lab you will make direct measurements of the pressure losses in a pipe flow system, and compare these measurements with predicted pressure losses. Figure 1: Oil pipe line in Alaska.
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ME 130L 17910 – 17975 The University of Texas at Austin Mechanical Engineering Department Fall ’10 Dr. Hidrovo 2 Figure 2: Schematic detail of Alaska pipeline. III. Experimental Procedure 1. Observation of laminar, transition, and turbulent flow in a pipe. Dye flow visualization will be used to see the difference between laminar and turbulent flow in a pipe. There are two transparent pipes for this experiment, one 3/4" and one 5/8" nominal diameter. Tests will be performed with both pipe diameters. Representative images of the different flow regimes for each pipe will be taken with the digital camera.
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ME 130L 17910 – 17975 The University of Texas at Austin Mechanical Engineering Department Fall ’10 Dr. Hidrovo 3 a. Open the valve on the rotameter two (2) full turns to clear air bubbles from the transparent pipe test section. The rotameter will top out at this flow, but that is OK. b. Turn the flow rate down below 0 . 1 gpm (very low flow) and open the needle valve on the dye injection tube. Momentarily open the dye valve sufficiently to get a high speed jet of dye to clear the line then back off on the valve until you get a smooth thin streak of dye.
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This note was uploaded on 09/05/2011 for the course ME 205 taught by Professor Koen during the Spring '07 term at University of Texas at Austin.

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ME 130L Lab_5 Fall 2010 - ME 130L 17910 17975 The...

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