Changes between Version 44 and Version 45 of WikiStart

Timestamp:

Sep 15, 2017, 2:10:58 PM (7 years ago)

Author:

steiger5na

Comment:

--

WikiStart

@@ -302 +302 @@
 '''Experiment EXP10'''
 
-The flow rate is increased, there are again a lot of bubbles. 
+The flow rate is increased, there are again a lot of bubbles.
 
 Time to reach the first corner: less than 1minute.
@@ -312 +312 @@
 '''Experiment EXP11'''
 
-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. 
+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.
 
 Conversion of flow rate from low to high water level:
@@ -325 +325 @@
 Note: 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
 
-Measured water level after the experiment: 72.7cm at the edge and 68.5cm over the topography. 
+Measured water level after the experiment: 72.7cm at the edge and 68.5cm over the topography.
 
 Time to reach the first corner: 3 min.
@@ -339 +339 @@
 '''Experiment EXP12'''
 
-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.  
+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.
 
 The 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.
 
 == 7.7 Friday 15 September ==
-=== Experiment 1''3'' ===
+=== Experiment 13 ===
 During night, we increased the rotation rate to get a rotation period of 30s! We kept the corners.
 
@@ -355 +355 @@
 For 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.
 
-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. 
-
-Note: The source is leaking, which created bubbles and a little "waterfall"
-
-  ''''
-  ''6 - Table of Experiments: ''
+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.
+
+Note: 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.
+
+'''Experiment 14'''
+
+We increase the influx to a desired value of 80 l/min with still the higher water level and increased rotation rate. 
+
+Due to the high flux rate, we use an exposure time of 30 ms. 
+
+Notes: 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.
+
+  '''' ''6 - Table of Experiments: '''''
 
  * will be updated from Excel sheet!