how to define a solid phase (hydrate) in porous media as a stagnant phase

hooman.esl · July 18, 2016, 11:04

Hi all,
i am a college student and working on hydrate dissociation in porous media.(when the pressure decreases, hydrate will dissociate and forms water and gas)
ch4.6h2o----> ch4 + 6h2o

at first we have the phases ( hydrate(s), water(l) and gas(g)) and all phases saturation are known.
i have some questions:
1) i have defined water and gas but i dont know how to define hydrate as third phase that wil be stagnant and have no motion.??!!!

2) there is a kinetic equation for hydrate dissociation(rate of generation/consumption of mass for each phase). how can i define it in UDF to fluent?

Katja · September 7, 2016, 09:13

Hello,

I am not very familiar with porous media, but for the first part of your questions I guess you do it like this:
Cell Zone Conditions-> Select the "Zone" of interest, Select the "Phase" of interest--> Edit... -> Check the "Fixed Values" box and then set X, Y and Z velocities to zero.

July 18, 2016, 11:04	how to define a solid phase (hydrate) in porous media as a stagnant phase	#1
hooman.esl New Member Hooman Join Date: Jan 2016 Posts: 19 Rep Power: 10	Hi all, i am a college student and working on hydrate dissociation in porous media.(when the pressure decreases, hydrate will dissociate and forms water and gas) ch4.6h2o----> ch4 + 6h2o at first we have the phases ( hydrate(s), water(l) and gas(g)) and all phases saturation are known. i have some questions: 1) i have defined water and gas but i dont know how to define hydrate as third phase that wil be stagnant and have no motion.??!!! 2) there is a kinetic equation for hydrate dissociation(rate of generation/consumption of mass for each phase). how can i define it in UDF to fluent?

September 7, 2016, 09:13		#2
Katja New Member Katja N. Join Date: May 2014 Location: Sweden Posts: 13 Rep Power: 12	Hello, I am not very familiar with porous media, but for the first part of your questions I guess you do it like this: Cell Zone Conditions-> Select the "Zone" of interest, Select the "Phase" of interest--> Edit... -> Check the "Fixed Values" box and then set X, Y and Z velocities to zero. hooman.esl likes this. __________________

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