X-ray Measurement of Cluster Velocity and Acceleration in the Near Wall Region – (PPT)

摘要

Cluster is one of critical issues in the gas-solid two-phase flow study. Its formation, dissolution and evolution has significant effect on the mass and heat transfer of the reactor. The widely adpoted measuring techniques, such as optical fiber and capacitance probe, generally involve the introduction of an intrusive probe into the reactor, which will disturb the flow field and thereby greatly decrease the reliability of measurement result. An X-ray based technique for the measurement of clusters in the near wall region was proposed in this study. By analyzing the one dimensional projection data, the information of voidage, size, velocity and acceleration of the cluster can be obtained simultaneously. Compared with the optical method, the newly developed technique can provide a trustworthy result noninvasively.