Solving Heat Transfer Using COMSOL for Laser Drilling on Silicon

  • Thread starter Thread starter Skyeagle
  • Start date Start date
Click For Summary

Discussion Overview

The discussion revolves around simulating heat transfer during laser drilling on silicon using COMSOL. Participants are addressing issues related to syntax errors in inputting equations, generating temperature profiles, and modeling heat flow in different scenarios.

Discussion Character

  • Technical explanation
  • Homework-related
  • Exploratory

Main Points Raised

  • One participant seeks assistance with syntax errors in defining a heat source equation for a transient heat transfer simulation in COMSOL.
  • Another participant suggests a corrected syntax for the equation, drawing parallels to MATLAB syntax and explaining the use of conditional expressions.
  • A participant mentions difficulties in generating the expected temperature profile after correcting the syntax.
  • There is an offer from another participant to assist with a simulation using Ansys as an alternative approach.
  • A user unfamiliar with COMSOL expresses a desire to model heat transfer along a wire and seeks guidance on achieving this in a step-by-step manner.
  • Another participant suggests using the conduction model for heat transfer and encourages reaching out for further clarification if needed.
  • A request is made for a detailed explanation of modeling heat flow and stress flow in a wire, indicating a need for foundational guidance.

Areas of Agreement / Disagreement

Participants express varying levels of familiarity with COMSOL, and while some provide suggestions and corrections, there is no consensus on the best approach to achieve the desired simulations. The discussion remains unresolved regarding the specific modeling techniques and outcomes.

Contextual Notes

Participants have not fully resolved the issues related to the accuracy of the temperature profile or the modeling of heat transfer in wires. There are also indications of varying levels of expertise among participants, which may affect the clarity of guidance provided.

Who May Find This Useful

This discussion may be useful for individuals new to COMSOL or those interested in simulating heat transfer processes, particularly in the context of laser drilling and heat conduction in materials.

Skyeagle
Messages
15
Reaction score
0
Hi guys,

I found this forum by chance. Was wondering if anyone could help out with my problem. I am very new to this COMSOL and I am required to tackle a problem.

I am required to simulate laser drilling onto a material using comsol to obtain the heat transfer pattern. I have chosen silicon in the drop-down box

I used the New>FEM>Heat Transfer>Conduction>Transient Analysis.
I then created a rectangle with 3 sides thermally insulated and the top is having heat flux.

Under Boundary settings, I need to enter the equation in the Q field as the heat source
The equation is like this: (10^7) x exponential (-10^3 x X^2) for a time of 2 seconds.

I keep having syntax errors. How do I put in the equation properly?

Thanks.
 
Engineering news on Phys.org
Hi Skyeagle,

Comsol syntax is pretty much identical to that of Matlab (well they share plenty of history) ... so for your equation you might try something like:

(10^7)*exp((-10^3)*x^2)*(t<=2)

I'm assuming what you're after with the "x" is a cartesian coordinate (or that is how comsol would interpret from the above)? The "t<=2" evaluates as "1" for t <=2 (assuming your t is in seconds) and 0 otherwise (you can do the same thing with a simple "if" - construct or use several of the other available step - function - lookalikes, if you for example wish to smoothen the transition to 0 value).
 
PerennialII ,

Thanks for the reply. yup. I got the waveform as per the syntax that you have given. Right now I need to generate the temperature profile which I am facing some problem.

Its not what I am expecting.
 
Yeah, these often take surprising chunks of time to get them working. Let me know if can try to come up with further pointers.
 
If you like I can help you out with a simulation in Ansys. Let me know if you want my help.
 
hi, I am don't no nothing about COMSOL, apart from the using a user guid to make a model and plot a graph.. what i wish to achieve is a wire ( rectangle ) which gives heat at one end and over time the heat eventually transfers over to the other.

Thanks kenn
 
i think you cn try with the heat transfer using the conduction model to do this...try using tat and contact if u have any doubt
 
as a complete novis to this software, could you explain to me in a step by step process how to achive a model of heat flow from one end of a wire to another? i would reli appreciate this, as well as a stress flow model as well (where one end increases in tensile stress and the other end increases in compressive stress), many thanks
 

Similar threads

Heat Transfer with Recirculating Chiller Problem
  • · Replies 13 ·
Replies
13
Views
2K
Heat Transfer Through a Two Material System due to a Light Source
  • · Replies 10 ·
Replies
10
Views
3K
Transient Heat transfer from water through pipe to ground
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Effective absorption coefficient of gold nanoparticles
  • · Replies 5 ·
Replies
5
Views
2K
Heat transfer through a MultiLayer Cylinder (find the Temperature inside)
  • · Replies 7 ·
Replies
7
Views
3K
Transient heat transfer in a cylinder with internal heating
  • · Replies 27 ·
Replies
27
Views
7K
Comsol moving boundary+ Heat Transfer
  • · Replies 8 ·
Replies
8
Views
21K
Exit flow rate in a Plate Heat Exchanger
  • · Replies 4 ·
Replies
4
Views
3K
How can I simulate laser drilling in Comsol or MATLAB?
  • · Replies 9 ·
Replies
9
Views
6K
How to design hydraulic system and size cooler
  • · Replies 6 ·
Replies
6
Views
3K