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Boundary Condition For Pressure vessel Problem

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Old   October 22, 2010, 03:58
Default Boundary Condition For Pressure vessel Problem
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Hi All,

I am solving a Unsteady CHT problem of pressure vessel 1 m dia and 10 m lenght, containing gas at 200+ bar. Vessel is covered with solid material 0.25 mm thickness. Gas is released suddenly from a opening, which causes sudden drop in Temp. from 300 k to -146 k. Mass flow rate @ outlet is 16 kg/s.
Now which BC should I give mass flow outlet or pressure outlet(@ 0 gauge pressure) or any other BC? Also is it necessary to specify heat transfer coeff. at outer solid surface, as am not simulating the outer domain?

Thanks in advance.
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