Changes between Version 55 and Version 56 of WikiStart


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Timestamp:
Sep 20, 2017, 1:44:49 PM (3 years ago)
Author:
steiger5na
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  • WikiStart

    v55 v56  
    415415==  ==
    416416== 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. 
     417The 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.
    418418
    419419== 7.9. Tuesday 19 September ==
     
    432432From 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.
    433433
    434 During this experiment, the honeycomb fell out of the source after the HS. We did therefore no vertical scan. 
     434During this experiment, the honeycomb fell out of the source after the HS. We did therefore no vertical scan.
    435435
    436436Note: This experiment had too many errors that we had to redo it!
     
    442442
    443443=== 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. 
     444For 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.
    445445
    446446Observation: The whole current went into the trough.
    447447
    448448=== 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. 
     449This experiment had the same setup as EXP21 but with the corner. The measured flow rate this time was only 100 l/min.
    450450
    451451Note: 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.
     
    455455== 7.10 Wednesday 20 September ==
    456456=== 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). 
     457After 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).
    458458
    459459Observation: 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 ===
     462We 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
     464Observations: 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.
    460465
    461466  '''' ''6 - Table of Experiments: '''''