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Nuclear Instruments and Methods in Physics Research A 544 (2005) 337341 Three-dimensional modeling of slab liquid jets used

Summary: Nuclear Instruments and Methods in Physics Research A 544 (2005) 337­341
Three-dimensional modeling of slab liquid jets used
for heavy-ion fusion for beam line protection
A.I. Konkachbaev, N.B. MorleyĆ, M.A. Abdou
Mechanical and Aerospace Engineering Department, 43-1134 Eng. IV, University of California, 420 Westwood Pza,
Los Angeles, CA 90095-1597, USA
Available online 2 March 2005
IFE designs for thick liquid protection of heavy-ion inertial fusion reactors utilize banks of liquid jets to protect
sensitive beam line components from neutrons and debris following target explosions. IFE designers must have
knowledge of the surface quality of these jets in order to determine the distance between the jets and the ion beams that
must propagate through the void spaces between them. Here, numerical simulations of such jet flows performed with
the customized Flow3D solver are reported. These numerical simulations predicted no significant jet breakup in the
region of interest, but did show surface and shape deformation that may end up determining the minimum standoff
distance between jets and driver beams. The simulations also show small-droplet ejection that may adversely affect
beam propagation characteristics. The intrusion distance of liquid into the beam lines was determined to be below 10%
of the original jet thickness throughout the computational domain (up to 1 m downstream from the nozzle).
Recommendations on how to avoid or minimize unwanted hydrodynamic phenomena (surface rippling and droplet
ejection) by upstream conditioning and nozzle design are developed for free surface jets in vacuum in the context of a
qualitative understanding of the physical mechanisms at play.


Source: Abdou, Mohamed - Fusion Science and Technology Center, University of California at Los Angeles


Collections: Plasma Physics and Fusion