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heat transfer through rotating metal wall

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Old   September 12, 2016, 10:20
Default heat transfer through rotating metal wall
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Hi all,

I'm trying to simulate the heating of the rotating metal drum filled with water. The heating is due to electron beam coming from outside, penetrating the metal wall (Ti alloy) and stopping in water. Rotation velocity is 600 - 1200 rpm, flow rate 3 - 5 gpm. Boundary conditions are the following:
Water domain:
heat transfer option: total energy
turbulence option: k-epsilon
Metal domain:
heat transfer option: total energy
Interface boundary:
water side
mass and momentum: no slip wall
wall velocity: rotating wall
angular velocity: 0.0001 rad/s (I used this small number just to activate the option. This is a water relative velocity at the water-metal boundary. Must be zero in reality, but when you put zero wall heat transfer does not work)
metal side
boundary type: interface
boundary details: conservative interface flux

The model attached

This device was experimentally tested with real electron beam, and we extracted the value of wall heat transfer coefficient 2-3 times smaller than the simulation gives.

I tried to change manually the wall-adjacent temperature by changing "tbulk for htc" in Expert parameters. I used the value of inlet temperature instead which seems lower, but I did not see essential change in whtc - it's still much higher than the value found in the test.
Is there anything missing in the model?
Attached Images
File Type: png drum_model.png (24.6 KB, 9 views)
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rotational flow, wall heat transfer

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