Device for processing and conditioning of material transported through the device

A reactor tube comprising:

• an inlet end and an outlet end for treating a fluid flowing through the reactor tube between the inlet and outlet ends,
• a plurality of grid structures arranged in series in a flow direction in the reactor tube for mixing the fluid flowing through the reactor tube between the inlet and outlet ends, wherein
• each of the grid structures consists of three sets of parallel partitions which bound flow channels with a flow cross section in the form of a regular polygon, and wherein
• the three sets of partitions of adjacent grid structures are rotated with respect to one another by an angle of 60 degrees with an orientation of the grid structures being repeated periodically.