Experiment Study on Critical Velocity in Vertical Pipes for Hydraulic Lifting

摘要

The issues of sediment siltation in vertical pipes for hydraulic lifting are frequently encountered in vertical pipes. Most of the proposed formulas had no physical meaning due to lack of comprehensive analysis of impact factors. Based on the experiments on single particle settling velocity in the static fluid, floating velocity for a single particle and critical velocity in a vertical hydraulic lifting system, a formula was developed for calculation of critical velocity in a vertical hydraulic lifting system. The formula accounts for main factors such as particle size and concentration. The formula was validated by compared with other experimental results. It would be useful for design and operation of vertical hydraulic lifting system.