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At What Temperature Does Water Evaporate When Drying A Solid ?

drying temperature solid solid drying wet bulb temperature simulation analysis

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#1 Checster

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Posted 30 November 2022 - 10:12 AM

Hi everyone :) ,

I am attempting to draw the Temperature Enthalpy diagram of water that is bound to a solid during a drying process. However, I have no idea how to get the evaporation temperature (temperature at which we have a straight line in the T-H diagram). How do I get this temperature ? 

 

Thank you very much. 



#2 StealthProg

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Posted 30 November 2022 - 11:01 AM

It can evaporate at any temperature.



#3 Bobby Strain

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Posted 30 November 2022 - 01:46 PM

It is not as simple as you state.

 

Bobby



#4 breizh

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Posted 30 November 2022 - 11:56 PM

Hi,

Let you try your favorite search engine, Key words: water phase diagram

https://byjus.com/ch...gram-of-water/ 

Edit: other resources attached.

Unit Operations in Food Processing - R. L. Earle (nzifst.org.nz)

Good luck

Breizh 



#5 latexman

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Posted 01 December 2022 - 07:39 AM

I don't have much dryer experience, but I think you'll need experimental data to get what you want.



#6 Saml

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Posted 01 December 2022 - 07:56 AM

You only get a straight line in the diagram while you are removing the "free" water. That is, your product is wet. And that assuming that you don't have anything dissolved in that water.

 

As soon as you start removing water that is associated with the solid, be it capillarity, hydrogen bonds, etc, the pressure start to fall, or the temperature to reach the same vapor pressure starts to rise.

 

As latexman said, you need experimental data on the specific material you are drying.

 

 

Edit: the book "Mass Transfer Operations" by Robert Treybal, in the chapter about Drying (one of the last chapters), has a very good discussion about the water equilibrium while drying. Is is a classic, so almost for sure in your college library.


Edited by Saml, 01 December 2022 - 08:12 AM.





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