|December 5, 2008, 12:56||
heat conduction in solid - mismatch to exp. res.
I simulate inst. cooling of a steel cylinder with fluent, but my results are far from matching with experimental data.
The situation is as follows:
- 2D simulation, axis symmetry
- 100 mm steel cylinder (diameter is 20 mm) starting temp. is ab 1023 K
- cooling from the front face with an impinging jet, almost 1D cooling, comparable with the Jominy end quench test, see http://info.lu.farmingdale.edu/depts...ominytest.html
- instead of water it is high pressure GAS => HTC is between 1500 and 2500 W/m2 K (that matches with data from literature)
- steel cylinder material data: -- heat conductivity temp. dependent, between 18 and 28 W /m K -- density 7900 kg/m3 -- heat capacity temp. dependent, between 450 and 630 J/ Kg K -- austenitic steel
Now, we are interested in the cooling rates at different distances from the frond face, as well as the cooling time from e.g. 800°C to 500°C (it is called "t800-500")
The simulation fits very well the measured data up to a frond face distance of ab 20 mm. BUT, the t800-500 data we simulate for higher frond face distance are more than twice as high as the experimental values!! (so the cooling is slower).
I have no idea, whats wrong. I tried a lot of different possibilities... like increasing the impinging jet turbulence, decreased the impinging jet temperature, changed the material parameters to maximum conductivity,....
Nothing helps. So there is maybe a principle problem with fluent???
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