“…Many studies of the FCI's effect on pressure drop have been performed. The velocity, heat transfer, and pressure drop in the ducts of simple geometries with an FCI with different locations of pressure equalizing slots (PES) have been investigated [17,[20][21][22], but detailed flow characteristics of MHD flows in ducts of complicated geometries with an FCI have not been studied as much. In the fusion blanket, a coolant duct system can have a curved part in a poloidal cross-section in order for the coolant to reach a region near the first wall and effectively absorb the heat therein.…”