CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT > Fluent Multiphase

Latent Heat Cannot be Less than zero

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By sree kumaran

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 29, 2022, 03:26
Post Latent Heat Cannot be Less than zero
  #1
New Member
 
Hellboy
Join Date: Apr 2018
Posts: 5
Rep Power: 6
cvnaditya is on a distinguished road
Hi all, I'm practicing multiphase analysis in fluent,

my problem involves air, R134a liquid & R134a vapour I have assign the properties and while going through initialization i have noticed this error.


Compute Node ID: 3
From-phase Domain ID: 1
To-phase Domain ID: 2
Cell Number: 0
Latent Heat: -294579

ERROR: Latent heat cannot be less than zero!

could you please help me to understand and resolve this error
cvnaditya is offline   Reply With Quote

Old   November 7, 2022, 04:20
Default
  #2
New Member
 
Sree Kumaran T
Join Date: Nov 2022
Posts: 4
Rep Power: 2
sree kumaran is on a distinguished road
have u found out how to solve the error
cvnaditya likes this.
sree kumaran is offline   Reply With Quote

Old   November 12, 2022, 11:25
Default
  #3
New Member
 
Hellboy
Join Date: Apr 2018
Posts: 5
Rep Power: 6
cvnaditya is on a distinguished road
yes, it is solved
cvnaditya is offline   Reply With Quote

Old   November 12, 2022, 11:44
Default
  #4
New Member
 
Sree Kumaran T
Join Date: Nov 2022
Posts: 4
Rep Power: 2
sree kumaran is on a distinguished road
Can u share how did u solve it please
sree kumaran is offline   Reply With Quote

Old   November 12, 2022, 11:54
Smile
  #5
New Member
 
Hellboy
Join Date: Apr 2018
Posts: 5
Rep Power: 6
cvnaditya is on a distinguished road
sure, in ansys it is suggested to consider latent heat for refrigerant in liquid material as zero

in ansys fluent, latent heat is calculated from standard state enthalpy of phase participating in mass exchange
only enthalpy difference matters

hvl(enthalpy total or vapour & liquid at ref temperature)= hv(vapour enthalpy)-hl(liquid enthalpy) at reference temperatures

so it is better to consider liquid enthalpy as zero
cvnaditya is offline   Reply With Quote

Old   November 12, 2022, 11:55
Default
  #6
New Member
 
Hellboy
Join Date: Apr 2018
Posts: 5
Rep Power: 6
cvnaditya is on a distinguished road
it is better to use

Tref= Tsat
hv, Tsat= hvl,Tsat
cvnaditya is offline   Reply With Quote

Old   November 12, 2022, 12:08
Default
  #7
New Member
 
Sree Kumaran T
Join Date: Nov 2022
Posts: 4
Rep Power: 2
sree kumaran is on a distinguished road
So in a evaporation condensation cycle should i put sse of water zero and air as it is
sree kumaran is offline   Reply With Quote

Reply

Tags
#multiphasefluent #vof

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
heat not balanced in the chtMultiRegionSimpleFoam solver carye OpenFOAM 19 September 26, 2019 05:25
what is latent heat of ethanol at 30 degree saturation temperature? 1757003@kiit.ac.in FLUENT 0 May 15, 2019 06:34
Heat Release vs. Apparent Heat Release // Comparison with GT Power MFGT CONVERGE 10 August 17, 2016 03:38
Compression stoke is giving higher pressure than calculated nickjuana CFX 62 May 19, 2015 14:32
Enforce bounds error with heat loss boundary condition at solid walls Chander CFX 2 May 1, 2012 21:11


All times are GMT -4. The time now is 03:00.