Fluid Mechanic Lab Report

2445 Words Apr 5th, 2011 10 Pages
Fluid Mechanics

Laboratory 2
Report

Robby Joseph
14103508

1.0 Introduction
This experiment was undertaken for the study of flow in pipes and the factors that affect it in both laminar and turbulent regimes. The transitional regime between laminar and turbulent flow will also be studied. The experiment was done using a pipe with a known diameter, and water was pumped in from a tank. Throughout the process, measurements of the quantity of water and time were taken as well as the hydraulic gradient. With these different parameters, the flow rate, Reynolds number and friction factor were able to be calculated for each test for water and mercury. The main purpose of the process was to analyse and identify the regions of laminar flow, and
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4.0 Procedure

4.1 Water Manometer Readings (Readings 1-12)

* Open the bench supply valve and adjust until there is a steady flow down the supply tank overflow pipe. * Turn the isolating tap to read the water manometer. * Use the needle valve to regulate the flow rates through the pipe so that your 12 readings cover the full extent of flow rates. Start from a low flow rate. * Take the readings of water manometer h1 and h2. * Collect a suitable quantity of water in measuring cylinder and record the time taken for the collection. During this operation care should be taken to (i) ensure that the flow pipe exit is never below the surface of the water in the measuring cylinder, and (ii) stand the measuring cylinder below the apparatus
Failure to meet these conditions will result in inaccurate flow rate reading, especially at the lower flow rates.

These readings should cover the whole of the laminar and transitional regions of pipe flow in the pipe.

4.2 Mercury Manometer Readings (Readings 13-30)

* The water supply to the pipe is now directly from the bench supply instead of the elevated tank. (This allows higher flow rates.) * Isolate the water manometer by turning the isolating tap to read the mercury manometer * Turn off the needle valve (to stop the flow) to check that mercury levels in the two branches of the manometer are level. *
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