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A mathematical method has been developed to solve the equations of a model for the cooling of self-heated particle beds. The model involves coupled equations describing the transport of mass and energy by single or two-phase coolant flow in a porous medium. Both transient and steady state situations are treated in one or two dimensions of space. Specific techniques have been developed to tackle this problem which is of highly non-linear character. We have tried to separate to a large extent the physics and the numerics, keeping the maximum of flexibility at the stage of discretization, and postponing the difficulties to the solution of the final set of non-linear algebraic equations. This flexibility is important as the physical model is mutually coupled to an experimental program still going on. The method has shown to be reliable in the range of parameters we have explored so far, and has relieved us of difficulties commonly encountered when dealing with multiphase flow problems. A computer program called "PAHR-2D" applies the method. The program has been written as a support to the in-pile Post Accident Heat Removal (PAHR) experimental programme. The scope is to assess the coolability of debris beds, to be assumed formed after a hypothetical core disruptive accident of a LMFBR.

Additional information

Bibliographic Reference: EUR 10230 EN (1985) MF, 34 P., BFR 150, BLOW-UP COPY BFR 200, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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