Water evaporation using light

Dear Frogfall relating to a former debate , do you have more infos about the energy needed when wapor is created regarding if it's fully dry or normally a mix of steam and evaporated water ?

Quote from Frogfall

Linked to the earlier research here, last November. But I think this could do with its own thread. Here is a more recent study.

https://newatlas.com/physics/mit-evaporation-experiment/

Doing some quick number-crunching shows that the latent heat of vaporisation for water is 0.423 eV per molecule. This is actually quite high compared to most liquids.

The energy of a single photon of green light is somewhere around 2.18–2.37 eV (depending on the hue of green). So there is more than enough spare energy in the light for evaporation, depending on the absorption mechanism.

Water molecules have quite a number of different vibrational modes, so the absorption mechanism could be quite complex.

https://water.lsbu.ac.uk/water…vibrational_spectrum.html

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This is very interesting for me due to my constant need to find ways to more efficiently desalinate water. Thanks!

Thank you for the sharing.... The French Serpollet done some kind of steam cars.. To remove water for better steam efficiency, the steam needed to cross some 1/10mm membrane or something like that.

L’automobile en 1902. 3e partie : Les voitures à vapeur

Gloubik Sciences est dédié aux anciennes revues scientifiques françaises, mais aussi aux livres de sciences et de vulgarisation scientifique (...)

sciences.gloubik.info

Quote from Frogfall

From this website

Yeah, but I've not had to carry out boiler calculations for quite a few years - so am now a bit rusty.

And I'm not really interested in getting into arguments over historical experiments.

The subtleties of blue tint of water  The blue color of water results from molecular vibrations instead of electronic ones and it has its own photochemistry.

It is astonishing that such a simple effect regarding such a common phenomenon and chemical has gone unnoticed for so long. This should encourage us in our research. Let's keep our eyes and our minds open!

Quote from fabrice DAVID

It is astonishing that such a simple effect regarding such a common phenomenon and chemical has gone unnoticed for so long

There has been a long history of unexplained anomalous absorption of solar radiation by clouds. Collocated satellite and surface measurements of solar radiation at five geographically diverse locations showed significant solar absorption by clouds, resulting in about 25 watts per square meter more global-mean absorption by the cloudy atmosphere than predicted by theoretical models. During the course of this process using laser light they found that the strongest evaporative effects happened when light that was polarized in a particular way known as transverse magnetic polarization hit the surface of the water at a 45° angle. It was also strongest with green light, which is suprising because that's the color that makes water appear the most transparent.