Analysis of Gas–Solid Two-Phase Flow Field in Basic Pipeline Components Based on Eulerian-Eulerian Models

Pipeline transportation is a common method in gas-solid two-phase flow, widely applied across various industries such as food processing, chemical products, and energy systems. This study uses the Eulerian-Eulerian two-fluid model to numerically simulate the flow characteristics of gas-solid dense-phase flow in horizontal, vertical, and elbow pipes. The results reveal stratification of solid-phase particles in horizontal pipes, more homogeneous flow in vertical pipes, and a significant velocity differential between the inner and outer elbow regions due to centrifugal forces. Additionally, pressure drop increases quadratically with flow rate and linearly with the solid-phase volume fraction. These findings provide valuable theoretical insights for the optimal design and safe operation of gas-solid two-phase flow systems.