Abstract
This paper presents results of calculation carried out in order to obtain heat that can be potentially generated in pneumatic pulsator nozzle during the work cycle. Pneumatic pulsators widely applied in industry where loose materials are stored and/or transported. In silos, where loose materials are stored, the phenomena of bridging creation can be observed. The bridgings are structures specific for loose material. They develop while cohesion forces are larger than gravity. Annihilation of these structures is crucial for plant fluent workflow. Therefore, the equipment for bridging creation prevention and/or bridging annihilation is widely utilize in loose material silos.
The airflow is driven by pressure gradient towards the silo outlet. Inlet pressure is assumed to be time- dependent and in consequence other quantities are also time-dependent. Air is modelled as compressible, thermodynamically ideal gas with invariant gas constant.
The results of the simulation were the basis for calculation of heat generated during the airflow. Negative values of the heat indicates that the nozzle will be cooled during infinitely many work cycles. Nonetheless, the influence of the heat on the characteristics of the nozzle material remains unknown. Therefore, further work needs to be considered in order to investigate the nozzle stress durability. The values of the heat obtained in this study indicate that there is possibility of nozzle durability decrease.
