# Changes between Version 25 and Version 26 of WikiStart

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Timestamp:
Sep 12, 2017, 10:48:10 AM (3 years ago)
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 v25 = ''6 - Table of Experiments: '' = ||'''''Exp No.'''''||'''''Name'''''||'''''Date_begin'''''||'''''$H_{total}$'''''||'''''$T_{rot}$'''''||'''''$Q$'''''||'''''$R_{curvature}$'''''||'''''$\Delta \rho$'''''||'''''Cameras'''''||'''''Dye'''''||'''''Comments'''''||''' Notes'''|| ||''''''''''||||''''''''''||$(m)$||$(s)$||$(L min!^{-1})$||$(m)$||$(kg m!^{-3}$||names||yes / no|||||| ||0||test||11092017 __[hh:mm hh:mm]__||0.60||50||?||0.50||0||PC01, PC02||yes||||Elin|| ||'''''Exp No.'''''||'''''Name'''''||'''''Date_begin'''''||'''''$H_{water}$'''''||'''''$T_{rot}$'''''||'''''$Q$'''''||'''''$R_{curvature}$'''''||'''''$\Delta \rho$'''''||'''''Diaphragme'''''||'''''Estimated flowrate'''''||''''' Cameras'''''||'''''Dye'''''||'''''Comments'''''||''' Notes'''|| ||''''''''''||||''''''''''||$(m)$||$(s)$||$(L min!^{-1})$||$(m)$||$(kg m!^{-3}$||$(mm)$||$H_1,H_2,\Delta t$||names||yes / no|||||| ||0||test||11092017 __[hh:mm hh:mm]__||0.604||50||58.5||0.50||0||13||170,150,41s||PC01, PC02||yes||||Elin|| ||1||exp01||??092017 __[hh:mm hh:mm]__||0.60||50||?||0.50||0||PC01, PC02|||||| The table starts rotating for the first time with a velocity of 50 rounds/ sec. It gets slowly filled with water to a level of 60 cm. This takes about 3h. Before we can start the experiments, the lasers first have to be adjusted. To check how long the water stays in the water, we conduct a little experiments with water (from the tank) that is enriched with particles. After about 2 hours a 4 mm thick clear surface layer develops. After filling the tank Thoma measured the water level to be point where water level does not change with rotation 60.4 cm Center of tank – 42.5 + 16 cm = 58.5 cm Tank wall (6.5 m) – 62.4 cm Particle sedimentation test Water was taken from the tank, mixed with particles (+ wetting agent) and set to settle in a glass “vase” with a narrow (ca 3cm) and tall (ca 10 cm) neck. The upper level with particles were observed at roughly 30 min intervals. || Time || level || ||11:50|| 0 || ||13.05||4mm|| ||13.30||5 mm|| After filling the tank Thoma measured the water level to be  point where water level does not change with rotation 60.4 cm  Center of tank – 42.5 + 16 cm = 58.5 cm Tank wall (6.5 m) – 62.4 cm Particle sedimentation test Water was taken from the tank, mixed with particles (+ wetting agent) and set to settle in a glass “vase” with a narrow (ca 3cm) and tall (ca 10 cm) neck. The upper level with particles were observed as follows: ||Time||level|| ||11:50||0|| ||13.05||4 mm|| ||13.30||5 mm|| At  14h40 the border was now longer visible. There were still particles in the upper part of the flask, but a lot less than there were intitally. '''Calibration of vertical laser sheet''' While changing the settings on the laser, the actual height of the laser sheet was measured directly in the tank. '''|| Laser setting || $H_{real} ||''' ||650|| 55 cm || ||700|| 49.5 cm|| ||800|| 40 cm || ||850 || 35 cm || ||900 || 30 cm || ||Laser setting||$H_{real}|||| ||650||55 cm|| ||700||49.5 cm|| ||800||40 cm|| ||850||35 cm|| ||900||30 cm|| We will use 650 :50: 900 to get Slices every 5 cm from 30 cm to 55 cm (total 6 Slices). '''TEST experiments''' The desired flow rate of 50 L/min should according to 0_DOCS\flow_rate.xclx should be achieved With a diaphragme of diameter 12.9 mm. We used 13 mm. The flow rate was estimated by measuring the time it took for the water Level in the feeding tanks to descend from 170 to 150 (with the pumps turned off) - it took 41s giving a flowrate of 40 L / 41 s = 58.5 L/min. The desired flow rate of 50 L/min should according to 0_DOCS\flow_rate.xclx should be achieved With a diaphragme of diameter 12.9 mm. We used 13 mm. The flow rate was estimated by measuring the time it took for the water Level in the feeding tanks to descend from 170 to 150 (with the pumps turned off) - it took 41s giving a flowrate of 40 L / 41 s = 58.5 L/min. The pipe was first opened to remove boubles from the system. The Sources was designed in a way that the hose stopped just below the top of the Source which was out of the pater, thus creating a small waterfall, turbulence and a lot of boubles that got throught the honeycomb and flowed along the slope With the current. The Source will be redisgned so that the water is inserted below the water surface. A second trial (still with the original source) was made later (when Samuel was back). The same ddiaphragme was used and the same amount of boubles was created. Flourescent dye (NAME) was injected first in the feeding tank above, then in directly in the water just upstream of the vertical laser sheet. Time series of photos was obtained from the vertical camera. Aperture 150ms Time between photos 450 ms. There were more particles in the inflow than in the ambient, and the border between the inflow and the ambient was seen to fluctuate up and down the slope. The timescale of this motion will be estimate from the photos tomorrow. Aperture 150ms  Time between photos 450 ms. There were more particles in the inflow than in the ambient, and the border between the inflow and the ambient was seen to fluctuate up and down the slope. The timescale of this motion will be estimate from the photos tomorrow. When turning to the horizontal cameras it was decided that sloping topography gave too many uncontrolled reflections that made it unsafe to increase the intensity. To remove these,parts of the bathymetry has to be Paint in black. The tank was set to empty during the night, while recycling the water. '''12 September''' The bathymetry has been painted black, a pipe has been introduced into the source and the drain has been lowered to that it can be used also for 60 cm water Depth.