G213 Unsteady Local Phenomena of Gas-Liquid Interface at Melt-Front Region with Melting High-Polymer Flow : Thin Rectangular Flow Configuration
Junji Mimatsu, Hideki Susa, Khairul Khafizan Masror · The Proceedings of the Thermal Engineering Conference · 2005
In the melting of high-polymer material on industrial applications, there are unsteady flow phenomena on its non-Newtonian properties. For the stability and controllable evaluations of flow and heat transfer, the unsteady interface phenomena in melt-front of high-polymer materials (PP) with several flow configurations (rectangular flow with 5mm & 1mm thickness, with/without artificial surface control) are shown as local and unsteady geographic shape of the gas-liquid interface experimentally with the visualizing images of high-speed CCD video. From experimental results and considerations, the gas-liquid interface changes its shape properties time-dependently, and the two-way transitions of phenomena and all-over instability are detected in the system, which mean that one is from the center to wall (fountain-flow-like), another is from near-wall to center by non-uniform slipping phenomena at near-wall region. These results is important in building the flow and heat transfer three-dimensional mechanism models of high-polymer flow by ejection process in rectangular flow system. As a result of this experiment, this research opens a new dimension by utilizing Wavelet in analyzing flow under artificial conditions.