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Thermofluidic Modelling of hydrogen absorption in metal hydride bed

Posted 18 mag 2011, 05:44 GMT-4 Heat Transfer & Phase Change, Computational Fluid Dynamics (CFD), Chemical Reaction Engineering, Parameters, Variables, & Functions Version 4.1, Version 4.3, Version 4.3a 14 Replies

Muhammad Assad
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For learning purposes, I was trying to do the this project Thermofluidynamic Modelling of hydrogen absorption and desorption in a LaNi4.8Al0.2 Hydride Bed at www.comsol.com/papers/7311/download/Lombardo.pdf (published in Comsol conference 2009 Milan). Except instead of two subdomain, I have only one domain containing the porous media and hydrogen enters the cylender through inlet. I am using the Darcy Law's Module and Heat transfer in Porous medium module. For kinetic expression, I have defined the formula in the definition section. I am using the same values and formulas defined in this paper. When I tried to run the program, I get errors which are associated with heat source definition and hydrogen mass absorption rate definition. Furthermore, I would like to see how would you plot the temperature and internal pressure plots which are published in the paper.


I have attached the file. Thank you in advance.

Attachments:

14 Replies Last Post 27 mag 2016, 15:48 GMT-4
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Hello Muhammad Assad

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Sofoklis Makridis
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Posted: 1 decade ago 26 nov 2011, 04:44 GMT-5
Dear colleague,
Did you solve the problem? In case you did, please send the improved model.
Regards
Dear colleague, Did you solve the problem? In case you did, please send the improved model. Regards
Jehad Yamin
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Posted: 1 decade ago 9 feb 2013, 07:22 GMT-5
Hi
Did you get the improved model?
If YES, can i have it too?
Hi Did you get the improved model? If YES, can i have it too?
Nessy Greenderson
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Posted: 1 decade ago 28 ago 2014, 12:28 GMT-4
There are multiple syntax errors (missing * sign, m63 instead m^3) or maybe they've appeared when i opened the file with comsol 4.3
Also, you have circular dependency: rhoss depends on Qm wich depends on phoss
You'll need to solve equation of hydrogen concentration (chemical reaction's rate equation). Look at appropriate articles, for example, M. GAMBINI, METAL HYDRIDE ENERGY SYSTEMS PERFORMANCE EVALUATION. PART A: DYNAMIC ANALYSIS MODEL OF HEAT AND MASS TRANSFER

I'm currently working on almost same case, but it keep giving me an error "trying to find logarithm of negative number" while the expression is log(abs(p)) !...
There are multiple syntax errors (missing * sign, m63 instead m^3) or maybe they've appeared when i opened the file with comsol 4.3 Also, you have circular dependency: rhoss depends on Qm wich depends on phoss You'll need to solve equation of hydrogen concentration (chemical reaction's rate equation). Look at appropriate articles, for example, M. GAMBINI, METAL HYDRIDE ENERGY SYSTEMS PERFORMANCE EVALUATION. PART A: DYNAMIC ANALYSIS MODEL OF HEAT AND MASS TRANSFER I'm currently working on almost same case, but it keep giving me an error "trying to find logarithm of negative number" while the expression is log(abs(p)) !...
Jehad Yamin
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Posted: 1 decade ago 16 set 2014, 16:48 GMT-4
I did something to the file and tried to improve it.
The main problem is in the heat source equation and inconsistent units.
If you wish we can work that together.
I am also trying to so that using FlexPDE software.
I did something to the file and tried to improve it. The main problem is in the heat source equation and inconsistent units. If you wish we can work that together. I am also trying to so that using FlexPDE software.
Jehad Yamin
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Posted: 1 decade ago 10 ott 2014, 09:53 GMT-4
If interested I can send you the file by e-mail.
If interested I can send you the file by e-mail.
Ismail Hilali
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Posted: 10 years ago 14 gen 2015, 06:47 GMT-5
yes, please send me files.

yes, please send me files.
Ankit Tiwari
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Posted: 10 years ago 15 gen 2015, 07:05 GMT-5
Try out with some constant values...may be you will get results..i am also hydrogen storage models..till now my results are not satisfactory....
Try out with some constant values...may be you will get results..i am also hydrogen storage models..till now my results are not satisfactory....
Jehad Yamin
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Posted: 10 years ago 29 mar 2015, 14:51 GMT-4
what is your e-mail?
what is your e-mail?
Ismail Hilali
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Posted: 10 years ago 30 mar 2015, 08:39 GMT-4
e-mail adress: ihilali@gmail.com
e-mail adress: ihilali@gmail.com
Djafar Chabane
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Posted: 10 years ago 21 apr 2015, 03:31 GMT-4
Hi
I used comsol for the same problem, can you please send me the model?
Many thanks.
Hi I used comsol for the same problem, can you please send me the model? Many thanks.
Djafar Chabane
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Posted: 10 years ago 21 apr 2015, 03:38 GMT-4
I downlod your model and i think there is a lot of thing miss in your model.
me i used the PDE for hydrogen absorption rate.
my problem is just related with initial and bondary conditions.
if you want, we can work together.
I downlod your model and i think there is a lot of thing miss in your model. me i used the PDE for hydrogen absorption rate. my problem is just related with initial and bondary conditions. if you want, we can work together.
Djafar Chabane
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Posted: 10 years ago 21 apr 2015, 05:33 GMT-4
yes, please send me files
yes, please send me files
Jehad Yamin
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Posted: 10 years ago 28 mag 2015, 14:54 GMT-4
What is your e-mail? Mine is jehadyam@yahoo.com
What is your e-mail? Mine is jehadyam@yahoo.com
Jehad Yamin
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Posted: 9 years ago 27 mag 2016, 15:48 GMT-4
Did you solve your problem with the metal hydride model?
Did you solve your problem with the metal hydride model?

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