Speed of flash steam formation

[Enviro21]

I was wondering what time it takes for hot water condensate to flash in a flash tank from the moment a unit of hot condensate is released into the flash tank to the moment the flash steam is formed?
Has anyone heard of researches that have tried to measure the phenomenon using high speed cameras? If you have please send a link.
Thanks,
Yani.

 

[LittleInch]

How precise do you need to be?

A unit sounds like you're talking a specific quantity which is then somehow exposed to a lower pressure.

Not quite sure why anyone would want or need to find out?

 

[IRstuff]

https://www.google.com/search?q=tim...1GCEU_enUS1161US1162&sourceid=chrome&ie=UTF-8

I would think that allowing for 1-2 seconds should be adequate for most use cases.

 

[LittleInch]

The size of this unit of condensate and how exactly it is "released" will impact the speed in which it turns into steam and water.

The relative level of superheating of the condensate will also impact the speed.

These boys know a lot about steam.... https://www.spiraxsarco.com/learn-about-steam/condensate-recovery/flash-steam?sc_lang=en-GB

And what are you considering as the start and end point? It will start flashing the millisecond it is "released", but the end of a single fixxed volume? of condensate will take longer to stop generating steam until no more is produced.

You need to explain what it is you're looking for and why.

 

[EdStainless]

Yes, this is a real calculus problem.
It will start very fast, and slow as the you reach the endpoint.
For much of the process it will limited by sonic velocity, steam can expand faster than that.

 

[Enviro21]

https://www.google.com/search?q=tim...1GCEU_enUS1161US1162&sourceid=chrome&ie=UTF-8

I would think that allowing for 1-2 seconds should be adequate for most use cases.

Hi, IRstuff,
From what I have read, this phenomenon is called flash steam because it happens in a split second. It would help me to know if it has been researched and quantified relative to a set of standardized test parameters. Why do I want to know this, because it is relative to a project I am working on. If anyone has any clues, let me know.
Cheers.

 

[Enviro21]

How precise do you need to be?

A unit sounds like you're talking a specific quantity which is then somehow exposed to a lower pressure.

Not quite sure why anyone would want or need to find out?

Why do I want to know this, because it is relative to a project I am working on. If anyone has any clues, let me know.

 

[Enviro21]

Why do I want to know this, because it is relative to a project I am working on. If anyone has any clues, let me know.

 

[Enviro21]

The size of this unit of condensate and how exactly it is "released" will impact the speed in which it turns into steam and water.

The relative level of superheating of the condensate will also impact the speed.

These boys know a lot about steam.... https://www.spiraxsarco.com/learn-about-steam/condensate-recovery/flash-steam?sc_lang=en-GB

And what are you considering as the start and end point? It will start flashing the millisecond it is "released", but the end of a single fixxed volume? of condensate will take longer to stop generating steam until no more is produced.

You need to explain what it is you're looking for and why.

Thanks LittleInch,
I was hoping to find an answer to this question in the millisecond range for my research project.

 

[LittleInch]

Thanks LittleInch,
I was hoping to find an answer to this question in the millisecond range for my research project.

Well you haven't let on very much there have you?

There are too many variables for this to be studied or calculated in any meaningful way.
10g of condensate at a high degree of superheat ( say 50 C) would be almost explosive so 10-20 mSec maybe.

Even 100g or 1000g condensate will be in the 500-2000 mSec range. Lower the degree of superheat and it takes even longer.

I'm not sure anyone has really ever seen a reason to find this out....

 

[Latexman]

I'm not sure anyone has really ever seen a reason to find this out....

I’m curious about what kind of process it is that this is even important.