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flow in a vertical annulus

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Old   December 14, 2010, 02:01
Default flow in a vertical annulus
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Arun
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hi,, i am modelling a flow in vertical annulus with porous media, with centrally placed heater and flow inlet and outlet conditions. it is surrounded by insulation. boundary conditions given are velocity inlet , volumetric heat generation and out flow. i am getting a reversed flow and there is no temperature rise in the annulus.

help me.....
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Old   December 14, 2010, 02:15
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hi.... i am also dealing with the same kind of problem. i have problem with out flow condition. i extended the domain and imposing new conditions....
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Old   December 16, 2010, 01:35
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i tried it n i didnt got the answer.....can any body help us
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Old   December 16, 2010, 11:15
Default reversed flow
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hi

Check your operationg conditions..(Gravity) and try changing BC for velocity use direction and magnitude option.

good luck
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Old   December 22, 2010, 01:48
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i gave velocity inlet and outflow condition, volumetric heat generation from heater and remaining side adiabatic.. i am using boussinesq approximation....
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Old   December 22, 2010, 03:14
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Change your outlet BC to outflow. and let us know about your results.
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Old   December 23, 2010, 06:27
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if i use air instead of water ..temperatures r rising upto 100 deg. for water its not lik that. volumetric heat generation is 300000 w/m^3.


also pls tell me how to model a porous medium....
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