Previous in Forum: Can Hydraulic Tubing J524 Be Used for Mechanical Linkage?   Next in Forum: Modulus of [Elasticity|Rigidity] and Shear Modulus
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
5 comments
Rate Comments: Nested
mech_student
Participant

Join Date: Sep 2017
Posts: 1

Degree of Freedom During Phase Change

09/02/2017 12:20 PM

During phase change,

number of components=1

number of phases=2

so by Gibb's phase rule,

degree of freedom=1

But we need dryness fraction in addition to temperature (or pressure) to completely identify the state of the system, so how is degree of freedom =1 justified?
Register to Reply
Pathfinder Tags: "Gibbs" "phase"
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Rixter
Guru

Join Date: Apr 2010
Location: About 4000 miles from the center of the earth (+/-100 mi)
Posts: 9911
Good Answers: 1141
#1

Re: Degree of freedom during phase change

09/02/2017 12:29 PM

Is number of components = 1?

http://www.uta.edu/faculty/mattioli/geol_2313/lect_12_2313_phase_diagram_crystallization.pdf
Register to Reply
Codemaster
Guru

Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4496
Good Answers: 137
#2

Re: Degree of freedom during phase change

09/02/2017 1:21 PM

Depends on the system

__________________
 Give masochists a fair crack of the whip
Register to Reply
SolarEagle
Guru

Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33392
Good Answers: 1817
#3

Re: Degree of Freedom During Phase Change

09/02/2017 9:54 PM

Yes you can have variables...but that doesn't effect the degrees of freedom...

http://www.colby.edu/chemistry/PChem/notes/GibbsPhaseRule.pdf

__________________
 All living things seek to control their own destiny....this is the purpose of life
Register to Reply
Mikerho
Guru
Hobbies - Musician - Engineering Fields - Chemical Engineering - New Member Engineering Fields - Control Engineering - New Member Engineering Fields - Instrumentation Engineering - New Member

Join Date: Jan 2007
Location: Moses Lake, WA, USA, Thulcandra - The Silent Planet (C.S. Lewis)
Posts: 4216
Good Answers: 194
#4

Re: Degree of Freedom During Phase Change

09/03/2017 11:34 PM

When you enter "dryness" into the system, your component count is now 2.

__________________
 "Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone." - Ayn Rand
Register to Reply
James Stewart
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14331
Good Answers: 162
#5

Re: Degree of Freedom During Phase Change

09/05/2017 1:53 PM

You have to learn to count all over again. Moisture and compound X is not a single component system.

__________________
 If it ain't broke, don't fix it. Just build a better one.
Register to Reply
Register to Reply
Have a Different Question?
5 comments
Copy to Clipboard

Users who posted comments:

Codemaster (1); James Stewart (1); Mikerho (1); Rixter (1); SolarEagle (1)

Previous in Forum: Can Hydraulic Tubing J524 Be Used for Mechanical Linkage?   Next in Forum: Modulus of [Elasticity|Rigidity] and Shear Modulus

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 (51 right now)
Show Members
Advertisement