TED-AJ03-288 UNSTEADY HEAT-FLUID 3D PHENOMENA AT MELT-FRONT REGION WITH MELTING HIGH-POLYMER FLOW : Transition of Phenomena with Local Configuration Change of Gas-Liquid Interface

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概要

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• Industrial melt-processing of high-polymer materials exploits several advantageous flow and heat transfer characteristics of these materials that result from their non-newtonian properties and non-linear temperature dependencies. These flow and heat transfer behaviors have become more important recently as they enable control of engineering quality and high-speed materials processing. In order to model heat-fluid phenomena, the melting high-polymer flow has been investigated using various methods of measuring the time-spatial flow and heat transfer properties and its unsteady effects. The present study demonstrates unsteady traveling phenomena observed at the gas-liquid interface in the melt-front of high-polymer flow using images analysis. The unsteady local geometric shape of the gas-liquid interface in the melt-front region, which had important effects on the entire flow and heat transfer properties, were determined in order to identify 3-D heat-fluid phenomena using continuous images obtained by a high-speed CCD movie system. The unsteady and local efficiencies of the shape configuration at the gas-liquid interface were analyzed numerically by cross-correlation between A2 (1/R) at various positions for detecting the transitional phenomena at the interface. As shown in Fig. A-1,the high-polymer materials (polypropylene : PP) were placed into a cylindrical heating tube in the form of short bars. Here, the material changed its phase aspect in transit by electric heaters. The melting fluid was extruded into a glass tube (test section : various types) through a nozzle using a piston operated by a controllable stepping motor in Fig. A-2. The surfaces of the Pyrex glass tube were tested under normal and artificial conditions with a thin-layer of silicon oil for comparison. As can be seen from the results shown in Fig. A-3,the gas-liquid interface changed its shape properties with time, and local configuration analysis revealed phenomena exhibiting two-way transitions, one from the center to wall (fountain flow), the other from near-wall to far-wall by non-uniform slipping. The heat transfer in the melt-front also changed and correlated with these two phenomena. These dynamic effects stemming from the high-polymer properties necessitated building models for the flow mechanism on the next-stage numerical simulations. [figure]

• 一般社団法人日本機械学会の論文

著者

• MIMATSU Junji

  Dept. of Mech. Eng., Gifu Univ.

• Mimatsu Junji

  Dept. Of Mechanical And Systems Engineering Gifu Univ.

• YAMAMOTO Yusuke

  Dept. of Mechanical and Systems Engineering, Gifu Univ.

• TAKEHARA Ryo

  Mechanical and Systems Engineering, Gifu University

• HIWADA Munehiko

  Mechanical and Systems Engineering, Gifu University

• INOUE Akira

  Mechanical and Systems Engineering, Gifu University

• Takehara Ryo

  Mechanical And Systems Engineering Gifu University

• Hiwada Munehiko

  Mechanical And Systems Engineering Gifu University

• Yamamoto Yusuke

  Dept. Of Mechanical And Systems Engineering Gifu Univ.

• Inoue Akira

  Mechanical And Systems Engineering Gifu University

関連論文

• Effect of Orifice Configuration on Heat Transfer Characteristics of an Impinging Jet
• TED-AJ03-288 UNSTEADY HEAT-FLUID 3D PHENOMENA AT MELT-FRONT REGION WITH MELTING HIGH-POLYMER FLOW : Transition of Phenomena with Local Configuration Change of Gas-Liquid Interface

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