13+flow+in+pipes+and+pipe+networks (1)

13+flow+in+pipes+and+pipe+networks (1) - CHBE 3200...

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Unformatted text preview: CHBE 3200 Transport I Dr. Lu 1 Flow in pipes: We derived before that pressure gradient We are interested in pressure difference in practice (e.g. sizing pumps) Dimensional analysis on the new problem: - keep as the core group - - From Bernoullis we know are equivalent pressure drop can be replaced by head loss : (Head loss defined as equivalent head of liquid to generate the same pressure difference ) CHBE 3200 Transport I Dr. Lu 2 Now we need to find f f . Laminar flow in pipe (Re<2,300) Turbulent flow in tubes difficult to calculate. Two options: Smooth tubes: Rough tubes: Intermediate Re: CHBE 3200 Transport I Dr. Lu 3 Example: - water (59F) flows through 6 ID cast-iron pipe - v avg = 4 ft/s - L = 120 ft - What is h L ? Step 1. Find e/D Step 2. calculate Re. Step 3. Find f f Step 4. h L = CHBE 3200 Transport I Dr. Lu 4 Figure 13.3. The Fanning Friction Factor as a function of Re and D/e...
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This note was uploaded on 10/18/2009 for the course CHBE 3200 taught by Professor Meredith during the Spring '08 term at Georgia Institute of Technology.

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13+flow+in+pipes+and+pipe+networks (1) - CHBE 3200...

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