Changes between Version 44 and Version 45 of WikiStart


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Timestamp:
Sep 15, 2017, 2:10:58 PM (3 years ago)
Author:
steiger5na
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    v44 v45  
    302302'''Experiment EXP10'''
    303303
    304 The flow rate is increased, there are again a lot of bubbles. 
     304The flow rate is increased, there are again a lot of bubbles.
    305305
    306306Time to reach the first corner: less than 1minute.
     
    312312'''Experiment EXP11'''
    313313
    314 The water level is increased by 10 centimeters to 68.5 cm. With the higher water level, we need to calculate new flow rates with the ration of the outflow area before and after the higher water level. Now, we are aiming to a flow rate of 33 l/min, which corresponds to the 20 l/min for the lower water level. 
     314The water level is increased by 10 centimeters to 68.5 cm. With the higher water level, we need to calculate new flow rates with the ration of the outflow area before and after the higher water level. Now, we are aiming to a flow rate of 33 l/min, which corresponds to the 20 l/min for the lower water level.
    315315
    316316Conversion of flow rate from low to high water level:
     
    325325Note: In the previous experiment, the measured flow rate was always  higher than the expected one with their diaphragme - flowrate curve. We  plotted the diaphrame vs. flowrate again with the values from our  experiments. For the flowrate of Q = 33 l/min, we therefore used a  diaphragme with  diameter of 10 mm, instead of 8.6 mm (which it was for  the 20 l/min flux  before).[[BR]]We measured the flux 4 times during this experiment. It gave:[[BR]]- 32.4 l/min[[BR]]- 34.5 l/min[[BR]]- 33.3 l/min[[BR]]- 34.9 l/min
    326326
    327 Measured water level after the experiment: 72.7cm at the edge and 68.5cm over the topography. 
     327Measured water level after the experiment: 72.7cm at the edge and 68.5cm over the topography.
    328328
    329329Time to reach the first corner: 3 min.
     
    339339'''Experiment EXP12'''
    340340
    341 This experiment was the same as EXP11 with a water level of 68.5 cm but with the corner. The expected flowrate was 33 l/min and the measured flowrate was 34.6 l/min. 
     341This experiment was the same as EXP11 with a water level of 68.5 cm but with the corner. The expected flowrate was 33 l/min and the measured flowrate was 34.6 l/min.
    342342
    343343The exposure time was increased to 40 ms, because the flow is slow - so no need to have a short exposure time. It makes the particles more visible.
    344344
    345345== 7.7 Friday 15 September ==
    346 === Experiment 1''3'' ===
     346=== Experiment 13 ===
    347347During night, we increased the rotation rate to get a rotation period of 30s! We kept the corners.
    348348
     
    355355For the desired fluxrate of 50 l/min, we used the diaphragme with 12.6 mm diameter. The measured fluxrate after the experiment was 54.5 l/min.
    356356
    357 Observations: In the beginning of the experiment, there were too many particles in the influx, but got less with time. The main current turned left at the second corner into the trough.
    358 
    359 Note: The source is leaking, which created bubbles and a little "waterfall"
    360 
    361   ''''
    362   ''6 - Table of Experiments: ''
     357Observations: In the beginning of the experiment, there were too many particles in the influx, but got less with time. The main current turned left at the second corner into the trough.
     358
     359Note: The source is leaking, which created bubbles and a little "waterfall" due the the water surface difference inside and outside the source. Thomas fixed it by putting a wooden block in front of the leakage.
     360
     361'''Experiment 14'''
     362
     363We increase the influx to a desired value of 80 l/min with still the higher water level and increased rotation rate.
     364
     365Due to the high flux rate, we use an exposure time of 30 ms.
     366
     367Notes: The water level increased constantly. After this experiment, we had to adjust the sink to let out more water. It takes some time, so we had to wait until the water level was good again.
     368
     369  '''' ''6 - Table of Experiments: '''''
    363370
    364371 * will be updated from Excel sheet!