20 巻 (1983) 5 号 p. 270-279
A numerical simulation calculating motion of individual particles was attempted for pneumatic conveying in the case of the presence of pipe branching. First, this paper summarizes the present method of simulation established for pneumatic conveying in a straight pipe and then explains coordinate transformation which must be made at the branching point. In the simulation the particles are assumed to be spherical, and the effects of friction between the particles and pipe wall which occur at the moment of collision are calculated by the use of Coulomb's law. Calculation was made in accordance with the conditions of a previous experiment in order to compare the results directly. As a result, it was found that the present method gives a good agreement with experiment so far as particle distributions are concerned. The calculated distributions of additional pressure drop along the pipe show qualitatively the same tendency as the measurements, but quantitatively the calculated values are several times larger than the measured ones.