In this master's thesis, the fluidisation behaviour of a bell-shaped nozzle and a standard nozzle for fluidised bed applications is characterised and compared. The aim is to investigate whether the use of bell nozzles can prevent the formation of dead zones during the fluidisation of a solid bed by a gas flow. These change the heat transfer and thus the process conditions of the fluidised bed system. The formation of dead zones is essentially influenced by the gas supply and thus by the nozzle geometry. To characterise the fluidisation behaviour, the two nozzles are installed in a cold model of a fluidised bed test plant and the pressure loss across the nozzles, the fluidisation pattern, the bed pressure and the bubble formation are determined experimentally. This shows that the pressure loss of both nozzles is identical and is therefore not influenced by the bell. Furthermore, the bell nozzle increases the fluidised area and thus minimises the formation of dead zones. In addition, the bell prevents the solid particles from falling through and the erosion potential of the inner part of the bell nozzle is reduced. Overall, it can be seen that the use of bell nozzles leads to a reduction in the dead zone area.