The influence of the jogging motor on the flow behaviour is less prominent when using finer magnesium turnings respectively a denser magnesium bed since axial dispersion is already less pronounced in comparison to coarse Mg turnings. Deviations in Bo are mainly caused by deviations between the magnesium beds in different experiments. One reason for the inhomogeneity of the beds is the so-called Brazil nut effect. Ripple et al. describe that when soil columns are packed by vibration, radial segregation and separation by particle size can occur, resulting in inhomogeneities in the packing. For the magnesium bed this would cause larger turnings to move to the top of the bed when it is shaken. It is known that the dispersion coefficient increases and Bo decrease when packed beds are not well packed. Though packing of the magnesium cartridge was done by using the same procedure every time to minimize this influence, having particles of non-uniform shape and size does not allow for perfectly packed beds and deviations within the bed and between beds must be accepted.