Previous in Forum: Worm Gears for Cargo Elevators   Next in Forum: UNIFLAIR AHU Minimal Fanspeed Change
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
8 comments
Rate Comments: Nested
paresh_career001
Power-User

Join Date: Oct 2008
Location: Gujarat, India
Posts: 142

Porosity Consideration While 1 D Numerical Coding of Regenerator

09/11/2012 11:58 PM

How do I consider porosity of porous material (phi) for cell volume into 1 D numerical coding by Finite volume method? Actually I am doing coding for regenerator used in cryocooler. Do I use volume of porous material as (phi)x(delta X)? Where delta X is width of a cell under consideration? What about free flow area for calculation of heat transfer coefficient? If you have any suitable paper, please attached here.

__________________
 Paresh B. Gujarati
Register to Reply
Pathfinder Tags: Porosity consideration while 1 D numerical coding
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Anonymous Poster #1
#1

Re: Porosity consideration while 1 D numerical coding of regenerator

09/12/2012 1:34 AM

Does a sieve have permeability of 1.00?
Register to Reply
paresh_career001
Power-User

Join Date: Oct 2008
Location: Gujarat, India
Posts: 142
#2
In reply to #1

Re: Porosity consideration while 1 D numerical coding of regenerator

09/12/2012 2:19 AM

Right Now, I assumed porosity as 0.6 for wire mesh.

__________________
 Paresh B. Gujarati
Register to Reply
Joshi
Guru

Join Date: Oct 2007
Location: India
Posts: 1246
Good Answers: 34
#3
In reply to #2

Re: Porosity consideration while 1 D numerical coding of re-generator

09/12/2012 2:54 AM

Where your calculation will lead you to, when it is based on assumptions? An assumed result/answer?
Register to Reply
Joshi
Guru

Join Date: Oct 2007
Location: India
Posts: 1246
Good Answers: 34
#4
In reply to #3

Re: Porosity consideration while 1 D numerical coding of re-generator

09/12/2012 2:56 AM

And what will be your assumption tomorrow and the day after?
Register to Reply
paresh_career001
Power-User

Join Date: Oct 2008
Location: Gujarat, India
Posts: 142
#5
In reply to #4

Re: Porosity consideration while 1 D numerical coding of re-generator

09/12/2012 3:09 AM

Thank you Mr. Joshi for response. I am just developing the code based on the equations not by value. I will later put actual value by measurement of porosity. If you know the answer how to calculate volume for 1 D cell, then just tell otherwise do not ask superfluous questions.

__________________
 Paresh B. Gujarati
Register to Reply Score 1 for Off Topic
Joshi
Guru

Join Date: Oct 2007
Location: India
Posts: 1246
Good Answers: 34
#6
In reply to #5

Re: Porosity consideration while 1 D numerical coding of re-generator

09/12/2012 3:50 AM

Short it out. Deep inside of these you may find your buried answer.

http://www.google.co.in/search?sourceid=navclient&aq=f&oq=porosity+of+porous+material+%28phi%29+for+cell+volume+into+1+D+numerical+coding+by+Finite+volume+method&ie=UTF-8&rlz=1T4ADFA_enIN339IN340&q=porosity+of+porous+material+%28phi%29+for+cell+volume+into+1+D+numerical+coding+by+Finite+volume+method&gs_upl=0l0l1l870844lllllllllll0
Register to Reply
Wal
Guru

Join Date: Jun 2011
Location: Phnom Penh
Posts: 4019
Good Answers: 102
#8
In reply to #5

Re: Porosity consideration while 1 D numerical coding of re-generator

09/12/2012 11:19 PM

What's with the attitude sport?!!

__________________
 Difficulty is not an obstacle it is merely an attribute.
Register to Reply
nick name
Guru

Join Date: Mar 2007
Location: City of Light
Posts: 3943
Good Answers: 183
#7

Re: Porosity consideration while 1 D numerical coding of regenerator

09/12/2012 8:11 AM

I had a look at the questions you put. Most of them could be answered by simply using a search engine. Why do you not do this first ?

As for the porosity have a look at the Darcy coefficient which is characteristic for flow through porous media.

The sieve porosity depends on the ratio free area to total area and cannot be set as one will wish.

At the indicated address you have a good book you should look at.
Register to Reply
Register to Reply
Have a Different Question?
8 comments
Copy to Clipboard

Users who posted comments:

Anonymous Poster (1); Joshi (3); nick name (1); paresh_career001 (2); Wal (1)

Previous in Forum: Worm Gears for Cargo Elevators   Next in Forum: UNIFLAIR AHU Minimal Fanspeed Change

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Mechanical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (144 right now)
Show Members
Advertisement