Predictions for gas-particle flows in horizontal channel affected by gravity and wall roughness

Guohui Li1, XueLiu2, Yang Liu3*

1Schoolof Electronic and Information Engineering, Dalian Jiaotong University, Dalian, 116028, China 2Performance Test Center, Harbin Power System Engineering and Research Institute, Harbin, 150046,China

3Marine Engineering College, Dalian Maritime University, Dalian,116026,China

ABSTRACT

A unified second-order-moment gas-particle two-phase turbulent model incorporated with kinetic theory of granular flows (USM-θ) is developed to study the particle dispersion behavior of dense gas- particle flows in horizontal channel with 6.96µm and 8.32µm wall roughness and with earth, lunar and micro gravity, respectively. Anisotropy of gas-solid two-phase stresses and the interaction between two-phase stresses are fully considered by two-phase Reynolds stress model and the transport equation of two-phase stress correlation. The flow behavior of particles in a horizontal channel experiments is numerically simulated. Result show that the wall roughness affects the particle concentration distribution, particle velocity, horizontal and vertical particle fluctuation velocity, particle temperature, axial-axial fluctuation velocity correlation of gas and particle and particle collision frequency. Combing earth gravity, lunar gravity and micro gravity with wall roughness, it influences on the redistribution particle Reynolds stress and interactions between gas and particle turbulent flows. Insert abstract here

Keywords

Unified second-order-moment stress model, gravity; wall roughness; gas-particle flows; numerical simulation