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Particle melting during flight

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Old   March 24, 2009, 11:56
Default Particle melting during flight
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Ellen
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Hi,

I'm trying to model a problem where solid particles are injected into a continuous high-temperature flow, and then may melt during the flight. but if I select the inert particle in the DPM model, the solver would not include the latent heat term. so I'm wondering if any of you could kindly give me an idea how to include this particle melting part in udf, or if there's other way to do that?

Thank you very much!

Regards,
Ellen
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Old   March 24, 2009, 13:50
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Allan Walsh
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One simplification would be to artificially increase the specific heat of your particle material so that as it heats to temperature T, the energy would be accounted for - sort of.
You could choose the built-in evaporation law and put in the appropriate latent heat.
I generally advise people away from UDFs because it is a steep learning curve to get anything useful. However, if you are comfortable with them, it is certainly an option.
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Old   March 24, 2009, 15:12
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Ellen
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Thank you for your answering my question, Allan. But I'm still not sure how to do that. If I were to enable the evaporation law, I need to select "droplet" as my particle type, right? then I need to supply all the properties like vapor pressure, also I'm asked to provide the evaporating species. But my particles are solid, I don't have the required input. Could you please elaborate your method a little more? Thanks a lot.

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