Talk:Flash evaporation

Extensive re-write

The article seemed to be focused only on the flash evaporation of a multi-component liquid and it did not discuss the evaporation of a single-component liquid at all. Also, some of the wording was confusing. Hence, I did an extensive re-write. I will complete the multi-component section with the next day or so. - mbeychok 05:11, 7 April 2006 (UTC)

I just finished the complete revision and expansion of this article. - mbeychok 07:34, 8 April 2006 (UTC)

Confused

Is the fact that flash evaporators are isentropic true for both multi-component systems as well as single? What are some properties of all flash evaporators? 143.246.14.19 (talk) 18:07, 13 April 2010 (UTC)PhysicsStudent

Glad you brought this up, because I erred in stating that the flash evaporation of a single-component liquid is isentropic. An adiabatic process is isentropic only if the process is reversible. I have corrected the article to state that the flash evaporation of a single-component liquid is isenthalpic. answer you In any event, the equation given for a single-component liquid is correct. mbeychok (talk) 22:11, 14 April 2010 (UTC)

Now that I have checked the article history, I see that I originally wrote that flash evaporation of a single-component liquid was isenthalpic. The change to isentropic was made by an unregistered user on March 23, 2009. So the error was not mine after all. mbeychok (talk) 22:35, 14 April 2010 (UTC)

Whew, that's a relief... — Preceding unsigned comment added by 192.158.48.17 (talk) 12:42, 29 January 2015 (UTC)

Derivation of Flash Evaporation Single Component & Definition of X

Mass Balance of initial and final liquid and vapour

$m_{i}=m_{f}$

$m_{l,i}=m_{v,f}+m_{l,f}$

Adiabatic energy balance

$m_{l,i}h_{l,i}=m_{v,f}h_{v,f}+m_{l,f}h_{l,f}$

$(m_{v,f}+m_{l,f})h_{l,i}=m_{v,f}h_{v,f}+m_{l,f}h_{l,f}$

$m_{l,f}h_{l,i}+m_{v,f}h_{l,i}=m_{v,f}h_{v,f}+m_{l,f}h_{l,f}$

$m_{l,f}h_{l,i}-m_{l,f}h_{l,f}=m_{v,f}h_{v,f}-m_{v,f}h_{l,i}$

$m_{l,f}(h_{l,i}-h_{l,f})=m_{v,f}(h_{v,f}-h_{l,i})$

${\frac {(h_{l,i}-h_{l,f})}{(h_{v,f}-h_{l,i})}}={\frac {m_{v,f}}{m_{l,f}}}$

or in articles original notation

${\frac {m_{v,f}}{m_{l,f}}}={\frac {H_{u}^{L}-H_{d}^{L}}{H_{d}^{V}-H_{u}^{L}}}$

The current article also suggests (from definition X = weight fraction vaporized) that X = m_vap ÷ m_total, where m_total = m_vap+m_liq, which is is the same definition as vapor quality. From the derivation, X should be defined as the 'ratio' of vaporised mass to remaining liquid.

$X={\frac {m_{v,f}}{m_{l,f}}}$ — Preceding unsigned comment added by RedHotIceCube (talk • contribs) 14:15, 22 October 2015 (UTC)

External links modified

Hello fellow Wikipedians,

I have just modified one external link on Flash evaporation. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

• Added archive https://web.archive.org/web/20070314224424/http://www.escwa.org.lb/information/publications/edit/upload/tech-01-3-e.pdf to http://www.escwa.org.lb/information/publications/edit/upload/tech-01-3-e.pdf

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 18 January 2022).

• If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
• If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 03:20, 2 October 2017 (UTC)