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| Accepteret svar Fra : molokyle | Modtaget 50 point Dato : 24-11-05 17:41 |
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| Kommentar Fra : molokyle |
Dato : 24-11-05 17:48 |
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..og så er der :
Citat Thymol BlueThymol blue is pH indicator that turns from yellow to blue between pH 8 and 9. Theworking fluid's pH is adjusted to just below this transition value, and the color changeis triggered electrolytically. As in the hydrogen bubble technique, described above, athin platinum wire placed in the flow acts as the cathode. The anode is placed at somedistance away from the region of interest. When voltage is applied across this circuit,hydrogen ions are created by electrolysis. The hydrogen ions move toward thecathode, where they lose their charge and combine to form hydrogen. This producesan excess of OH ions near the cathode, which triggers a change in fluid color aroundthe platinum wire. This technique effectively produces a line source of blue dye.Side view, showing main horseshoe vortex (Thymol blue visualisation, Re = 1.4 x 103) http://www.engga.uwo.ca/people/esavory/hemispheres.htm |
http://web.mit.edu/fluids-modules/www/exper_techniques/5.Electrolytic_Techniques.pdf
</MOLOKYLE>
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| Kommentar Fra : molokyle |
Dato : 24-11-05 17:52 |
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| Godkendelse af svar Fra : hubi |
Dato : 25-11-05 12:12 |
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