Trajectory images have been obtained of a colored strand in the high density polyethylene (HDPE) melt flowing through a converging wedge channel by a visualization technique.
Various pore network models used for different pore structures were designed by applying visualized micro-experimental techniques and as the gas reservoir water-bound plugging happened under the conditions of different structures, two phase(gas-water) micro distribution characteristics were studies and the law of the influence of pore structure on the gas reservoir water-bound plugging were found out according to these models.
The principles and new developments of some major flow visualization experimental techniques, e.g., classical hot_wire anemometer, PIV, and novel ones like laser_induced fluorescence and molecular tagging velocimetry are reviewed and their usefulness for particular situation is discussed.