Entrained air (ejection process) by flow of freely falling particles of the bulk material is considered by us from the position of the classical laws of dynamics of twocomponent streams "particulate matter - the air." The nature of this process is determined by the volumetric intercomponent interaction, detected as a result of excessive speed over the speed of the incident particles of ejected air. The research is being supported by the Council for Grants of the President of the Russian Federation (projects NSH-588.2012.8), RFBR (project number 12-08-97500-p_center_a), and Strategic Development Plan of BSTU named after. V. G. Shukhov
