NUMERICAL SIMULATION OF EROSION OF GAS-SOLID SUSPENSION FLOW IN A PIPE WITH A TWISTED-TAPE INSERT

摘要

The gas-solid suspension swirling tube with a twisted-tape insert is expected to improve the heat transfer performance of pure gas flow. The generated swirling motion of particles, however, will have the possibility of crucial erosion damage on the pipe wall and tape surface. In order to clarify the effect of gap width on the erosion and quantify the erosion damage in the gas-solid suspension swirling pipe flow with twisted-tape insert, numerical simulation of erosion was performed by using Eulerian/Lagrangian approach and two-way coupling method. When the gap is small, the belt-shaped highly concentrated region of particles is formed near the pipe wall and causes the crucial erosion damage like ditch on the pipe wall. If the gap is large, the erosion damage can be decreased and the uniform distribution of particles near the pipe wall is realized. The latter effect is advantageous to the use of increased heat capacity by adding particles.