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DPM Modelling: Colloid droplet evaporation

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Old   August 1, 2007, 01:23
Default DPM Modelling: Colloid droplet evaporation
Meng Wai Woo
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Hi- This is a long message to make my case clear. If anyone is able, please help.

Case: -Running a DPM model to tracking evaporating droplets.

-Specific to my desired product, the evpaoration rate should drop corrsponding to the droplet moisture content.

-Implemented a UDF droplet drying model which returns the droplet saturated surface vapour pressure correponding to the droplet mositure for 80% volatile droplet.

-Arbitrarily set the boiling point very high to activate only the built-in evaporation model.

Problem: -There is a sudden drop in particle mass throughout the evaporation preiod towards the end of of the evaporation curve wher the volatile component is ~4%. The final volatile component after the drop is 0%.

-Please go to the link attached below for the illustration. this is an enlargement of the final section fo the curve.

-Not sure why is this happening. Try to debug the UDF. It should give a continuous saturation pressure. After the drop, the evaporation model is not activated anymore.

-Is this a FLUENT built-in limitation? Anyone has idea how to overcome this?

Worried, Woo
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Old   August 1, 2007, 01:27
Default Re: DPM Modelling: Colloid droplet evaporation
Meng Wai Woo
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Another picture illustrating my problem. this is the enlargement of the droplet mass vs time curve towards the end of the evaporation period.
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