Magneto-hydro-dynamic-simulation of square duct flow with three-surface-coated multi layers

This research performs MHD flow simulation of a square duct flow with three-surface-coated multi-layers by RNG k- model. It is confirmed that a thicker metallic layer leads to higher pressure loss especially under high Ha numbers while a critical value for Ha/Re to characterize transition from turbulent flow to laminar flow is almost the same regardless of wall conditions under the low Re numbers. Depending on the thickness of the metallic layer, the flow field turns into Hartmann flow or M-shape flow under high Ha numbers. The simulation proves that only the thickness difference of hundreds of m for the metallic layer is not ignorable in the design of the multi-layer coating, which leads to the necessity of uniform coating technology with high accuracy.