Low-temperature melting alloys are very attractive heat transfer medium once high temperature or extremely high heat flux application are considered, like nuclear power stations, cooling of industrial furnaces to recover waste heat, concentrating solar power stations just to mention a few. Main advantages of low-temperature melting alloys are high heat capacity, high heat conductivity and resistance that is why in case of high temperature applications they are considered as a considerably safer heat transfer medium than water or air. This paper concentrates on the designing original experimental stand for investigation of heat transfer processes in low-temperature melting alloys, especially lead-bismuth eutectic (LBE) alloy will be considered as a heat transfer medium. The article presents development of Computational Fluid Dynamics model of flow and heat transfer in the LBE alloy. The developed mathematical model was used to design original experimental stand for investigating heat transfer in low-temperature melting alloys. Especially, the mathematical model allowed us to choose crucial elements of the experimental stand: a heating chamber for heating the liquid metal, a heat exchanger: liquid metal - water, in which the process of receiving heat from the liquid metal takes place, and an "air pump” driving the process of liquid metal flow through the stand. Moreoover, the CFD model was used to estimate parameters of the experimental stand: dimensions of individual elements, mass flows of fluids involved in heat transfer, operating temperature ranges, flow resistance, rated power of the LBE heat exchanger. The main aim of carrying of the CFD simulations was to verify correctness of main assumptions standing behind the experimental stand. The paper presents results of the CFD simulations and their influence on the final design of the experimental stand.