CFD analysis was performed in IHX to find the pressure drop and heat transfer between primary and secondary sodium flow using ANSYS 18.1. A similar anisotropic porous technique was used for both primary and secondary flow inside and outside the bank of tubes. A decoupled analysis was performed with prescribed heat source/sink distribution. The distributors and baffles are attached to achieve uniform flow and heat removal in secondary flow. A coupled analysis of the primary and secondary sodium heat exchange is also performed by using the flow field obtained with the distributor. The flow distributor reduced the radial temperature variation <20 K within the bundle region. A 3D sectoral model was analysed and estimated the effects of a mixing device in the secondary flow. The temperature difference again reduced to 7 K at the secondary flow exit, by mixing hot sodium of outer region with that of the inner region. Copyright © 2022 Inderscience Enterprises Ltd.