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

Mass convergence within heat exchangers

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 3, 2021, 03:46
Default Mass convergence within heat exchangers
  #1
Member
 
Join Date: Jan 2018
Posts: 30
Rep Power: 5
UchihaMadara is on a distinguished road
Hello all,
I have a toy example for heat exchanger where I am testing for different configurations to later create a lower fidelity simulation.
The concern here is that althouth the flow through manifold inlet and manifold outlet conserves, the flow through tube-inlets and tube outlets doesnt! The result is shown below, where entrysection_i and exitsection_i indicate sections at tube inlets and tube outlets respectively.


entrysection1 0.00034643523
entrysection2 0.0003462541
entrysection3 0.00035063147
entrysection4 0.00034650993


exitsection1 0.00035752518
exitsection2 0.00035785544
exitsection3 0.00035796402
exitsection4 0.00035505854
inlet_inmanifold:21 0.00144
outlet_outmanifold:20 -0.0014399984


One can observe that entry1 and exit1 does not match. Same goes for other 3 sections.
Could someone point out, what could be the reason for this mis match?
I have tried suggesting that this is due to fluid remaining within the manifolds, which leads to this difference in the mass flow rate within tube inlets and tube outlets, but apparently, I have been told, that flow in should match the flow out within the tube as well.
Any pointers?
The flow is turbulent (RE>3500), with standard k-epsilon model.
Attached Images
File Type: png HX.png (71.0 KB, 4 views)
File Type: jpg mesh1.jpg (141.8 KB, 4 views)
File Type: jpg mesh2.jpg (84.1 KB, 5 views)
UchihaMadara is offline   Reply With Quote

Reply

Tags
mass conservation, mass flow rate

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
Fluent Heat exchanger model gimson FLUENT 0 May 10, 2021 04:30
Continuity Equation for multicomponent simulation lordluan CFX 15 May 19, 2020 18:36
Interphase mass transfer of a reaction cfx_ws1992 Main CFD Forum 0 May 15, 2017 21:42
Centrifugal fan-reverse flow in outlet lesds to a mass in flow field xiexing CFX 3 March 29, 2017 10:00
Two-Phase Buoyant Flow Issue Miguel Baritto CFX 4 August 31, 2006 12:02


All times are GMT -4. The time now is 09:34.