COATING/PAINT THAT CHANGES COLOR WHEN WET; REVERTS WHEN DRY
COATING/PAINT THAT CHANGES COLOR WHEN WET; REVERTS WHEN DRY
(OP)
My company is working on a project to develop a methodology of accurately measuring the wetted surface on the upper spring line of a large (i.e., 130’ diameter) cylindrical metal container with a domed top; that is, the spring line represents the departure or aperture of the domed top to the vertical sides of the cylinder. There will be a water source delivering 400-500 gallons per minute on the top of the dome, when required to keep the container cool. The measurement of the wetted surface is to ensure that the water distribution system on the dome is effective at covering the required amount of surface to meet the design cooling requirements. The desired measurement technique/methodology needs to be low tech, and repeatable. I am looking for a coating or paint that could be applied at the spring line, which when wet, changes color and when dry or drier, changes back.





RE: COATING/PAINT THAT CHANGES COLOR WHEN WET; REVERTS WHEN DRY
RE: COATING/PAINT THAT CHANGES COLOR WHEN WET; REVERTS WHEN DRY
Have you considered using liquid crystal thermometers?
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RE: COATING/PAINT THAT CHANGES COLOR WHEN WET; REVERTS WHEN DRY
RE: COATING/PAINT THAT CHANGES COLOR WHEN WET; REVERTS WHEN DRY
Reversible color indicating dessicants (e.g. Drierite) use cobalt chloride. I imagine that this mineral could be added to a clear paint or even an adhesive, give it a try.
RE: COATING/PAINT THAT CHANGES COLOR WHEN WET; REVERTS WHEN DRY
TTFN
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There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx
RE: COATING/PAINT THAT CHANGES COLOR WHEN WET; REVERTS WHEN DRY
If you're concerned about temperature, measure temperature. There are liquid crystal filled paints which change colour with temperature- very spendy, not very good, but available.
There are also pH indicating paints, which may vary between the pH of the wetting water and of steam condensate.
RE: COATING/PAINT THAT CHANGES COLOR WHEN WET; REVERTS WHEN DRY
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.