Effect of Different Pressures on Polymer Flow at a Contraction Path: A Real-Time Numerical Approach

Authors

Muhammad Afiq Azmi, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Penang 14300, MalaysiaFollow
Zulkifli Mohamad Ariff, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Penang 14300, MalaysiaFollow
Raa Khimi Shuib, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Penang 14300, MalaysiaFollow
Arjulizan Rusli, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Penang 14300, MalaysiaFollow
Ku Marsilla Ku Ishak, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Penang 14300, MalaysiaFollow
Mohamad Danial Shafiq, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Penang 14300, MalaysiaFollow
Zuratul Ain Abdul Hamid, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Penang 14300, MalaysiaFollow
Zulfirdaus Zakaria, Institue for Advanced Studies, Universiti Malaya, Kuala Lumpur 50603, MalaysiaFollow
Muhamad Husaini Abu Bakar, System Engineering and Energy Laboratory, Universiti Kuala Lumpur Malaysian Spanish Institute, Kulim 09000, MalaysiaFollow
Muhammad Khalil Abdullah, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Penang 14300, MalaysiaFollow

Abstract

The complexity of polymer flow through a contraction arises from the simultaneous occurrence of shear and elongational strains near the entrance of the contraction path (die). Although this phenomenon has been extensively studied, the effect of plunger motion on the flow toward the contraction path remains underexplored. This study investigated the rheological behavior of thermoplastic polymers at a contraction flow path to enhance the understanding of their flow and rheological behavior, including variations in velocity, pressure, viscosity, and shear rate under varying loads. Polypropylene (PP), a semicrystalline polymer with a low melting point, was used as the test material. The operating temperature was set to 180 °C, and the displacement of the plunger, marked with black lines at its initial and final heights, was recorded under loads of 0.3, 0.6 and 0.85 MPa. The displacement rates were analyzed using MATLAB. A dynamic mesh approach in ANSYS 19 was employed to simulate the real-time motion of the plunger, incorporating a user-defined function developed in C language to control the dynamic boundary motion. The numerical approach successfully simulated the rates of plunger displacement (speed) and predicted the viscosity of PP within the paths (barrel and die). Results indicated that the plunger speed increased with pressure. The pressure generated by the plunger created a driving force that overcame the resistance to flow within the barrel. Higher pressure from the plunger resulted in a greater driving force, which increased the flow rate of the polymer melt through the barrel. On the other side, as the polymer melt flowed from a large cross-sectional area to the contraction flow area, the velocity of the polymer molecules increased, resulting in a pressure drop in the PP melt. Polymer molecules became oriented and stretched in the flow direction upon entering the contraction area, further increasing the shear rate. Consequently, the reduced cross-sectional area in the contraction increased the flow rate, elevated the shear rate, and decreased the viscosity, facilitating polymer flow through the contraction.

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Recommended Citation

Azmi, Muhammad Afiq; Ariff, Zulkifli Mohamad; Shuib, Raa Khimi; Rusli, Arjulizan; Ku Ishak, Ku Marsilla; Shafiq, Mohamad Danial; Hamid, Zuratul Ain Abdul; Zakaria, Zulfirdaus; Abu Bakar, Muhamad Husaini; and Abdullah, Muhammad Khalil (2024) "Effect of Different Pressures on Polymer Flow at a Contraction Path: A Real-Time Numerical Approach," Makara Journal of Technology: Vol. 28: Iss. 3, Article 2.
DOI: 10.7454/mst.v28i3.1678
Available at: https://scholarhub.ui.ac.id/mjt/vol28/iss3/2