CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Temperature Distribution on a circuit board

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

LinkBack Thread Tools Search this Thread Display Modes
Old   March 27, 2003, 10:10
Default Temperature Distribution on a circuit board
Posts: n/a
Hi there!

I have been given the task to simulate a reflow-soldering process. As I have never used CFD before, I hope that somebody here in this forum can help me with that. A link to some helpful resources on the net would also be very much appreciated.

The most interesting part to me is to simulate the temperature distribution on the circuit board while it goes through a convection-soldering oven. If possible, I would also like to simulate the temperature distribution in a condensation-soldering oven in a later stage of the project.

The convection oven has a length of about 4m and consists of 5 different temperature zones ranging from about 450K to 550K. The circuit board is transported through the oven with the help of a chain. The software should be capable of simulating the movement of the circuit board, as the board passes several air guide plates. While the board is transported through the oven, hot air is blown at it through a number of nozzles. In the first stage of the project, the board will be "naked". Later, the model should be extended and components like ICs will be placed on the board.

Maybe somebody here also knows how to model the process in a condensation-soldering oven. Again, what interests me is the temperature distribution in the circuit board. The difference is, that this time there is no air blowing at the circuit board. Instead, the board moves through saturated steam, which leads to film condensation on the board and the components located on it.

My first problem now is to find the best software for the given task. My predecessor, who already built a model, was using CFDesign 4.1. The software I have considered so far is FLOTHERM, ICEPAK, CFDesign 5.0 and StarCD.

Thx a lot,

  Reply With Quote

Old   March 27, 2003, 11:32
Default Re: Temperature Distribution on a circuit board
Harry Fulmer
Posts: n/a
The choice will depend on the modelling methodology adopted. If you want to explicitly include the effects of steam, moving conveyor etc then you'd be better off with a general purpose tool (StarCD).

If it's justified to make assumptions like the conveyor is static (w.r.t. the velocity scales in the ovens so the full model can be broken down into a series of steady state models with the board in different locations), that the steam effects can be included via modification of the fluid properties and phase change heat transfer is insiginificant compared to more standard convection, conduction and radiation then you'd get an answer much more quickly using tools such as FLOTHERM or ICEPAK.

If you're wanting to get a feel of thermomechanical stresses in the board then FLOTHERM has the advantage of FLOSTRESS, a fully embedded stress solver with direct links to the CFD generated T field. This module I believe has been created specifically for board level and solder joint stress prediction.

Good luck!
  Reply With Quote


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
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
Cryosurgery - temperature distribution problem Tal FLUENT 3 October 18, 2010 15:58
Temperature distribution in a solid michael_krobath OpenFOAM Running, Solving & CFD 3 August 29, 2007 07:12
temperature distribution in a plate with 2 metals Amir Khodabandeh FLUENT 1 March 16, 2007 02:51
Temperature local distribution on the boundary Matteo Siemens 0 January 10, 2007 07:18

All times are GMT -4. The time now is 01:39.