DYNAMIC PARTICLE TRANSPORT IN HORIZONTAL PIPES BASED ON THREE-LAYER MODELING: SIMULATION AND EXPERIMENTAL STUDY

摘要

A new 1D dynamic model was developed to predict the liquid-particle flow behavior in a horizontal pipe. The dynamic model combines three effects: steady-state solutions, the Bernoulli effect (due to local accelerations), as well as the flow separation and re-circulation zone occurring at the lee-side of a dune. Experiments of liquid-particle flow were conducted in a medium-scale flow loop, and the results were compared with the dynamic model. Two high-speed cameras were used to measure the particle dune characteristics, mainly length and height of the dune, as well as the particles velocity. Particles were spherical glass beads with median diameter of 0.3 and 1.2 mm. Water was used as test fluid, and the flow was fully turbulent. It was found that the model captured the essential physics of particle transport for the measurements reported, such as prediction of pressure drop fluctuations, as a function of both space and time.