the extraction cells consist of hollow bodies with inlets and outlets of liquid connection. the cells are first filled with the liquid chosen to be the stationary phase. under rotation, the pumping of the mobile phase is started, which enters the cells from the inlet. when entering the flow of mobiles phase forms small droplets according to the stokes' law, which is called atomization. these droplets fall through the stationary phase, creating a high interface area, which is called the extraction. at the end of the cells, these droplets unite due to the surface tension, which is called settling.