TITLE : 3D Nucear-Power STEAM GENERATOR (Library Case: W802)

BY : CHAM Development Team

DETAILS:

• A cylindrical tube-and-baffle steam generator is simulated
• The heat-flux distribution from hot water in the immersed tube bank is prescribed
• The flow is three-dimensional and steady
• Steam and water enthalpies, volume fractions and velocities have been calculated by use of the IPSA procedure
• A polar-coordinate grid is used

NOTES:

• Steam generators of this kind are employed in nuclear power plant of the pressurized-water-reactor kind Contours of volume fraction of steam, formed from water entering at the bottom of the cylindrical vessel.

  The steam-generation pattern is not symmetrical because the temperature of the water in the immersed U-tubes falls between inlet and outlet.
  /phoenics/d_polis/d_applic/d_power/sgr1
  The water enthalpy, measured above a base value corresponding to the entry temperature, just below boiling point.

  The water becomes super-satuurated where the heating fate is most intense.
  /phoenics/d_polis/d_applic/d_power/sgh2
  Contours of upward velocity of steam.

  The flow pattern is far from being axi- symmetrical.

  
  /phoenics/d_polis/d_applic/d_power/sgw1
  Contours of upward velocity of water.

  Note that the water velocities are smaller than the steam velocities, because of inter-phase slip.

  /phoenics/d_polis/d_applic/d_power/sgw2
  The distribution of pressure.

  The pressure diminishes with increase in height partly because of gravity and partly to accelerate the steam-water mixture.

  /phoenics/d_polis/d_applic/d_power/sgp1

  wbs