Variation Law and Calculation Model of Slurry Critical Non-silting Velocity under the Action of Swirler

Critical non-silting velocity, a key parameter in slurry pipeline transport systems, significantly influences operational conditions and economic viability. A lower critical non-silting velocity is advantageous for reducing energy consumption, minimizing pipeline wear, and enhancing system stability. To achieve this objective, this study proposes a method to improve the particle suspension state within slurry pipelines through the addition of a swirler. The research comprehensively investigated variations in the critical non-silting velocity under diverse conveying conditions, comparing scenarios both with and without the swirler. The results demonstrate that the swirler induces a circumferential flow within the pipeline. This flow exerts a drag force on particles, promoting their transition from a settled state to a non-silting flow regime, thereby reducing the critical non-silting velocity. For slurries characterized by low concentration, small particle size, and low density, the circumferential kinetic energy required to alter their flow state is smaller; consequently, the reduction in critical non-silting velocity is more pronounced. The calculation model of critical non-silting velocity considering the swirl characteristics was established. Compared to experimental values, the model yields an average error of 9.10% and a maximum error of 14.08%.