Work procedure
1. Fill in feed tank 1 with liquid.
2. Open faucet 4 on 1/4-1/5 turnover and set up small value of water flow.
3. Measure indications of both piezometers 2 corresponding to the particular flow rate.
4. By means of calibrated tank 5 find the volume W of liquid and time T with stopwatch. Determine the liquid speed Vav in the pipe and Reynolds’ number corresponding to liquid temperature (graphs =(t) for water and AMG-10 oil are given in Appendix1 and 2).
5.
With formula 2.3 calculate
an experimental coefficient of resistance
taking
into account
the piezometers indications at inlet and outlet of the pipe (
,
).
The received results put down in Table 2.1.
6. Put all received data in a graph Lg(100)= Lg(Re).
7.Put down theoretical values of coefficient of resistance, calculated with formulas 2.4, 2.5, 2.6. For calculations by these formulas use the same experimental data.
8. Compare experimental and theoretical results.
9. All results of measurements and calculations put down in Table 2.1.
10. Make conclusions.
Table 2.1
Experimental liquid |
AMG-10 oil |
Water |
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Number of measurement |
1 |
2 |
3 |
4 |
1 |
2 |
3 |
4 |
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Time for filling calibrated tank T, s |
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Measured volume W, cm3 |
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Flow rate Q, cm3 /s |
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Flow Speed Vav, cm/s |
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Piezometer readings |
H1, cm |
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H2, cm |
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Pressure Losses h1 , cm |
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Experimental value ex |
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Re- number |
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Theoretical value theor. |
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