Pipeline system for transporting consumer goods, parcels and mail in capsules

Abstract

The aim of the paper is to investigate a concept of a pipeline transport system that employs stationary linear induction motors to propel lightweight capsules. Theoretical considerations on optimal solutions as well as modelling of the system behavior is presented. The idea is to adapt existing pipeline construction technologies to achieve cost-effectiveness. For that reason usage of guiding/powering rails is excluded and the pipe is of circular shape. The proposed capsule dimensions are diameter of ca. 1.4 m and length of ca. 2.8 m. The exact dimensions would depend on the existing logistic chains, e.g. pallets that are used. The main findings of the article are developed dimensionless groups, computational fluid dynamics model of a capsule moving in a pipeline and an analytical model of capsule dynamics. Dimensionless groups have been verified using the model of capsule dynamics. Grid sensitivity study has been done and iterative convergence errors have been assessed for the computational fluid dynamics model. Parametric study has been conducted for a range of capsule velocities and pressure differences acting on a capsule. Results allowed describing the rate of air leaking between the capsule and pipe in an analytical form. The influence of viscous forces has been shown to be negligible in comparison to pressure forces. Developed tools allow studying various scenarios before construction of an experimental stand. It is of scientific and practical significance for any research team that would continue the study on pipeline transport systems.