Lab 5 - MEMORANDUM Date: April 6, 2007 To: Sei Young Lee...

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MEMORANDUM Date: April 6, 2007 To: Sei Young Lee From: Case Gornstein Re: Flow in Pipes Results of flow visualization studies (reference two diagrams) While observing the flow visualizations in each pipe, I noticed that changes were not happening very gradually. The flow would quickly go from laminar, through the transitional phase, and then to turbulent. Adjusting the flow rate to find where transitions were occurring was a little tedious because of this. According to the pre-lab calculations for each size pipe, the ¾” pipe was expected to be laminar until 0.6 gpm and become turbulent at a little more than 1 gpm, and the ⅝” pipe was expected to be laminar until 0.51 gpm and turbulent at 0.89 gpm. The actual data we collected showed everything happening much sooner, within a smaller range. In the ¾” pipe, it was laminar until 0.24 gpm and became turbulent around 0.42 gpm, and in the ⅝” pipe it was laminar until 0.16 gpm and turbulent about 0.23 gpm. The major difference is that the calculations were based on ideal conditions using certain Reynolds numbers that vary not only on test circumstances, but who you ask. And since the equipment is definitely not perfect, these values don’t seem to be unreasonable. Results of head loss studies (reference calculations pages for friction factor and uncertainty analysis and figure 1 for chart of friction factor vs. Reynolds number)
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This note was uploaded on 04/07/2008 for the course ME 130L taught by Professor Fredthomas during the Spring '08 term at University of Texas at Austin.

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Lab 5 - MEMORANDUM Date: April 6, 2007 To: Sei Young Lee...

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