关键词: 携砂实验, 砂粒运移, 临界流量, 模拟实验, 运移规律

Abstract: A series of laboratory experiments on sand grain migration pattern in sand-carrying pipe with different angle of inclination were performed using the self-made test equipment.The critical flow rates of sand grains with different size migrated from the sand-carrying pipe with different angle of inclination were measured.The relationship between size of sand grain and critical flow rate was revealed.The experimental results indicate that the fluid flow rate and the angle of inclination of sand-carrying pipe have great influence on the sand-carrying capability.The size of sand grain gets larger with the increase of fluid flow rate.The migration patterns of sand grains change with angle of inclination of sand-carrying pipe.The sand grains migrate as the uniform suspension pattern in the vertical pipe,while sand grains move as the un-uniform separate beds in the inclined pipe.The test of critical fluid flow rates for the same size of sand grains indicate that the sand-carrying capability in the vertical pipe is the highest,while the sand-carrying capability in the pipes with 60 degrees in angle of inclination is the lowest.

Key words: sand-carrying experiment, sand grain migration, critical flow rate, simulated experiment, migration rule