Abstract Details
Abstracts
Author: Andrei E. Khodak
Requested Type: Poster
Submitted: 2019-02-22 16:45:00
Co-authors: I.D.Kaganovich, A.Khrabry
Contact Info:
PPPL
MS08 C-Site Engineering Wing 1
Princeton, New Jersey 08543
United States
Abstract Text:
Plasma interaction with liquid metal film as a plasma facing component was investigated making use of a customized version of the general purpose CFD code CFX from ANSYS. We study liquid metal Magneto Hydro dynamic (MHD) stability in the presence of plasma and effects of plasma motion along the walls as a function of liquid metal film thickness and flow velocity. Computational Fluid Dynamics (CFD) tool and approach were developed at PPPL to model plasma interaction with plasma facing components. This code can simulate complex 3D geometry and conjugate heat transfer in plasma, liquid, and solid regions simultaneously, as well as a free-surface flow of metal facing the plasma and droplet formation. The surface tension model was generalized to include temperature and space charge effects on the surface tension. Evaporation is also incorporated into the model. The model is self-consistent; conservation laws are applied throughout the whole domain consisting of plasma and solid regions. MHD model of liquid metal film (LMF) flow is also developed to simulate current in LMF and magnetic field self-generation. MHD set-up uses magnetic vector potential formulation and accounts for the Hall effect. Fast and stable convergence of the numerical solution was obtained by increasing implicitness of the numerical scheme via implementing proper source coefficients in the governing equations. For simulation of evaporated dense plasma, we take into account the ion and electron diffusion, thermal diffusion and their effects on the electric field and heat sources, as well as effects of the space-charge sheaths. Non-equilibrium conditions in the plasma are simulated using separate equations for the electron and gas temperatures and for transport of ions. The model was successfully applied to simulate an atmospheric pressure arc discharge and liquid metal plasma facing components in fusion devices.
Comments:
