Abstract:

Investigation of dispersed particle rotation characteristics in multi-phase flow is important in understanding the mechanism of multi-phase flow.In previous studies, many people focused on Magnus force produced by particle rotation in solid-gas two-phase flow, and proposed Magnus lift coefficient at different Reynolds numbers through experimental and theoretical investigations.In recent years, many researchers have studied the effect of particle rotation on the flow field through theoretical numerical simulation and dealt with particle rotation by improving multi-phase flow numerical model, and the simulated results are in agreement with experimental results.But because of the limitation of the model, it is impossible to take into full account the influence of particle rotation on particle cluster and surrounding flow field.From the experimental aspect, many researchers use high-speed digital imaging system to measure particle rotation speed and particularly one author successfully measured particle rotation speed in real gas-solid two-phase flow.Nevertheless, more accurate and efficient method needs to be developed.The authors of this paper proposed that the application of the direct numerical simulation in particle rotation characteristics simulation should be the emphasis of research in the future.And the technology of the reconstruction of 3D motion and structure of the object from image sequence in computer vision science should also be paid much attention in particle rotation speed measurement.