ABSTRACT
The phenomenon is of practical importance in the design of dust exhaust systems where high speed motion of crushed and pulverized material induces airflow of a magnitude which can influence the rate at which air must be exhausted. The rate of induced airflow is seldom as large as in the example cited above but a knowledge of its magnitude is important, whether large or small, for a sound design of the exhaust system. One approach for estimating the magnitude of induced airflow in various circumstances or for systematic correlation of practical field data is needed to place these problems on an engineering base. The net inward airflow induced by falling material is therefore that corresponding to the height of fall from the source to the enclosure entrance, as indicated on the diagram. The airflow induced by a grinding wheel or abrasive cutting wheel is due to the high velocity projection of the inertials produced in the grinding process.
