Changes between Version 55 and Version 56 of WikiStart
- Timestamp:
- Sep 20, 2017, 1:44:49 PM (7 years ago)
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WikiStart
v55 v56 415 415 == == 416 416 == 7.8 Monday 18 September == 417 The whole day was used to build the extension of the topography to move the source 2m further back. The source sits now at the same position relative to the topography, only 2m further back. The cameras stayed at the same positions. We used this day to process data and to learn more about UVMAT. 417 The whole day was used to build the extension of the topography to move the source 2m further back. The source sits now at the same position relative to the topography, only 2m further back. The cameras stayed at the same positions. We used this day to process data and to learn more about UVMAT. 418 418 419 419 == 7.9. Tuesday 19 September == … … 432 432 From the PIV of previous experiments with a flow rate of 80, we have decided to decrease the dt from 100 to 50ms and also the exposure time from 30 to 20ms, because the correlations were not very high. However, the dt = 50 ms did not work during this experiment, so that in fact it was dt = 100ms, because only every second image was taken. 433 433 434 During this experiment, the honeycomb fell out of the source after the HS. We did therefore no vertical scan. 434 During this experiment, the honeycomb fell out of the source after the HS. We did therefore no vertical scan. 435 435 436 436 Note: This experiment had too many errors that we had to redo it! … … 442 442 443 443 === Experiment EXP21 === 444 For this experiment, we wanted to increase the flow rate to Q = 110 l/min, with a diaphragme of 17 mm. The measured flow rate was 120 l/min. The experiment was again without corner and dt = 50 ms, E = 20 ms. 444 For this experiment, we wanted to increase the flow rate to Q = 110 l/min, with a diaphragme of 17 mm. The measured flow rate was 120 l/min. The experiment was again without corner and dt = 50 ms, E = 20 ms. 445 445 446 446 Observation: The whole current went into the trough. 447 447 448 448 === Experiment EXP22 === 449 This experiment had the same setup as EXP21 but with the corner. The measured flow rate this time was only 100 l/min. 449 This experiment had the same setup as EXP21 but with the corner. The measured flow rate this time was only 100 l/min. 450 450 451 451 Note: The flow rate is difficult to measure for high values, as the time interval is shorter and therefore produces a larger error. However, in the end we can plot a diameter - flow rate curve fitted with all the values from our experiment. The diaphragme should determine the flow rate quite clearly and with the fitted curve, we can get the actual flow rate. … … 455 455 == 7.10 Wednesday 20 September == 456 456 === Experiment EXP23 === 457 After swirling up the particles in the tank, we started early at 08:13 with the first experiment. It is the same experiment as EXP22 with a flow rate of Q=80l/min. The calculated flow rate is 94 l/min, which is very close to the previous flow rate (100l/min). 457 After swirling up the particles in the tank, we started early at 08:13 with the first experiment. It is the same experiment as EXP22 with a flow rate of Q=80l/min. The calculated flow rate is 94 l/min, which is very close to the previous flow rate (100l/min). 458 458 459 459 Observation: The flow was similar to the previous experiment, with the main current entering the trough. A large rotation occurred on the shelf. 460 461 === Experiment EXP24 === 462 We increased the water level to 70 cm and kept the corner. The plan was to do one experiment with Q=110 l/min, but because that was so similar to 80 l/min before, we decided to increase it to 130 l/min (diaphragme 19.5mm). We kept the small dt = 50 ms and the E = 20 ms. 463 464 Observations: The current entered the trough in a very large radius and builds an anti-cyclone on the shelf. Only a very small part of the current went straight, passing the trough. 460 465 461 466 '''' ''6 - Table of Experiments: '''''
