Research on the influence of the suction force on spherical particles in suction flow

While scholars are aware of the suction force of particles (F-Dn) in gas-solid flow, until recently, most researchers have considered the drag force (F-D) to be F-Dn, and there are few application functions for the calculation of F-Dn; this will affect the design of air-suction seeders, check valves, or other machines based on particle absorption. Therefore, it is necessary to re-build an applicable function of F-Dn and verify the equivalence between F-Dn and F-D. In the present study, the empirical formula of F-Dn, which includes the suction hole diameter (D), particle diameter (Delta p), distance from the particle center to the suction hole (L-p), pressure difference (Delta P), gas density (rho(g)), and gas viscosity (mu(g)), is established via dimensional analysis, and the application scope is 0.571 <= D/d(p) <= 1, 0.5 <= L/d(p) <= 0.634, and 3000 Pa <= Delta P <= 5000 Pa. Some conjectures are provided based on the comparison of the results of CFD simulations and experiments. For instance, F-Dn may be a combination of multiple forces, one of which is the dominant force F-D. This research introduces a new method and device for measuring F-Dn for use by other researchers, and contributes to the existing research on particle absorption. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study re-established the applicable function of particle suction force (F-Dn) and verified its equivalence to drag force (F-D), providing reference for the design of air-suction seeders and other machines. Conjectures were made based on the comparison of experimental results, suggesting that F-Dn may be a combination of multiple forces. The introduction of a new method and device for measuring F-Dn contributes to the existing research on particle absorption.