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$$$$ HRAYO    NOTICE  CHAT      11/09/12    21:16:28     7124           
                                             DATE     11/09/12

  Procedure HRAYO                         Voir aussi :
     ---------------   
  CHAM1 = HRAYO MCV MODL1 MATE1 T1 MODL2 MATE2 T2 (GEO1) (FLOT1) ;
                                                                         

     Description :
     ____________

     This procedure calculates a linearized exchange coefficient for
 the treatment of radiation with an infinite medium or "face to face"
 (between two very close boundaries).


      Contents :
      _________

     MCV   : convection model (MMODEL type)

     MODL1 : radiation model defined on boundary 1.

     MATE1 : emissivity field defined on boundary 1
             (MCHAML type)

     T1    : temperature field on boundary 1
             (CHPOINT type)

     MODL2 : radiation model defined on boundary 2.

     MATE2 : emissivity field defined on boundary 2
             (MCHAML type)

     T2    : temperature field on boundary 2
             (CHPOINT type)

     GEO1  : geometry defining the relations between les points of the
             T1 et T2 fields
             (MAILLAGE type)

     FLOT1 : Stefan-Boltzmann constant (default value 5.67e-8 Wm-2K-4)
             (FLOTTANT type)
                                                                         
     CHAM1 : coefficient d'echange linearise
              (MCHAML type)

     Notes :
     ______
                                                                         
  In case of "face to face" radiation the model MCV is defined on an
  object of 'MAILLAGE' type created with the two supposed homologous
  boundaries by means of the operators RACC or LIAI. The boundary 1
  corresponds to the first argument of these operators and boundary 2
  to the second argument.

  In case of radiation with an infinite medium, the objects MODL2
  MATE2 and T2 are defined on boundary 1 and correspond to the
  characteristics of the infinite medium.