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laser heating (wafer example, temperature decrease in advance with step function)

Posted 9 giu 2017, 01:46 GMT-4 Heat Transfer & Phase Change, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 5.2 0 Replies

Xing Zhang
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Hi, all,

I met a problem about the temperature of laser heating material.

I used the wafer example. Remove laser velocity so it will be fixed and heat the center area. And I add a step function in the heat flux so the laser heat only for 20s. The simulation time is 30s.

However, the temperature always decrease before 20s (around 18s). The same thing happened to my other simulations of other materials.

I wonder what causes this temperature decrease in advance. Because physically, it should increase until laser irradiation disappear. If I remove the step function to let it heat for the entire process (30s), the temperature will never drop.

Thanks.
Xing
0 Replies Last Post 9 giu 2017, 01:46 GMT-4
COMSOL Moderator

Hello Xing Zhang

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