Heating up solid particles

[gforney]

Please complete the following lines...

Application Version: 5.5.0
SVN Revision Number: 6004
Compile Date: 05 Apr 2010
Operating System: Microsoft Windows XP Professional 2002

In the example below I tried to heat up solid particles. The temperature of
the input gas is 500°C. According to the section 12.3.1 in the FDS User
Guide EVAPORATE is set to .FALSE.; After starting the calculation an error
occurs:
"ERROR: PART 1 If one of SPECIFIC_HEAT or HEAT_OF_VAPORIZATION defined,
both must be".
After including the line "HEAT_OF_VAPORIZATION=1." no error occurs, but the
particle temperature does not increase as expected.

Herbert

Original issue reported on code.google.com by he.tauber on 2010-04-22 10:01:50

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• Attachment: Heating.fds

[gforney]

This is an error in the manual. Setting EVAPORATE=.FALSE. has caused FDS not to do 
the heat transfer calculation to the droplet.

We are currently changing the way we handle non-evaporating, solid particles. For an

example of where we are heading, see the sample cases called hot_spheres.fds in the

Sample directory, under Radiation. Run this case, and then change your case to be 
similar. Then I can help you if it does not work. 

Original issue reported on code.google.com by mcgratta on 2010-04-22 12:10:39

[gforney]

I'm sorry, but it doesn't work. The particles don't move and heat up. Therefore I ask
for your help.

Herbert

Original issue reported on code.google.com by he.tauber on 2010-04-23 07:41:55

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• Attachment: Heating2.fds

[gforney]

Yes, I looked again at the source code. Your case is not currently possible. There 
are two ways FDS handles particles -- (1) evaporating droplets that can move, or (2)

non-evaporating particles that do not move. I suggest you remove EVAPORATE=.FALSE.

and then just increase the vaporization temperature to a high value. Then the 
particles should just heat up  and evaporate a very little. Let me know if that 
helps you.

Original issue reported on code.google.com by mcgratta on 2010-04-24 18:11:48

[gforney]

It does help me, but the value of heat_of_vaporization has to increase as well.

Furthermore I noticed that in the updated User Guide in section 15.15 PART
(Lagrangian Particles/Droplets) the line "VAPORIZATION_TEMPERATURE" was removed.

In the section 12.3.4 Velocity on solid surfaces it is written that when a droplet
strikes a solid surface, it sticks and is reassigned a new speed and direction. This
would not apply to solid particles, because the behaviour is not the same as at
liquid droplets. Is there a option in FDS that solid particles do not stick on the
wall but will skip back from the vertical wall to the gas flow?

Original issue reported on code.google.com by he.tauber on 2010-04-26 08:22:17

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• Attachment: Heating3.fds

[gforney]

Yes, increase all parameters that control evaporation. The only way to control the 
droplets on the surface is by adjusting the horizontal and vertical droplet 
velocity. The User's Guide should have these. Let me know if you can't find them.

Original issue reported on code.google.com by mcgratta on 2010-04-26 12:20:53

[gforney]

Thanks,
Herbert

Original issue reported on code.google.com by he.tauber on 2010-04-28 12:38:29

[gforney]

(No text was entered with this change)

Original issue reported on code.google.com by mcgratta on 2010-05-04 15:14:25