Study of Dynamic Flow and Mixing Performances of Tri-Screw Extruders with Finite Element Method

Zhu, Xiulin; Wang, G.; He, Yu; Cheng, Zhen

doi:10.1155/2013/236389

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…According to the literature, first triangle-arrayed triple-screw extruder was designed by a research group from Beijing University of Chemical Technology and was patented in 2001 [28], while first trials in industrial scale were performed in 2006 [29,30]. This new equipment for polymer processing, provides advantages in compounding of polymeric blends and composites.…”

Section: Extruders As Chemical Reactors -Basic Conceptsmentioning

confidence: 99%

Reactive extrusion of bio-based polymer blends and composites – Current trends and future developments

Formela¹,

Zedler²,

Hejna³

et al. 2018

Express Polym. Lett.

108

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Abstract.Reactive extrusion is a cost-effective and environmentally-friendly method to produce new materials with enhanced performance properties. At present, reactive extrusion allows in-situ polymerization, modification/functionalization of polymers or chemical bonding of two (or more) immiscible phases, which can be carried out on commonly used extrusion lines. Although reactive extrusion has been known for many years, its application for processing of bio-based polymer blends and composites is a relatively new direction of scientific research. This work presents a literature review on recent advances in the processing of bio-based polymer blends and composites via reactive extrusion. We described compatibilization mechanisms for different types of biodegradable polymeric materials based on: (i) aliphatic polyesters, (ii) aliphatic polyesters/starch and (iii) aliphatic polyester/natural rubber systems. A special attention was focused on conventional and dynamic cross-linking of bio-based polymer blends and composites as an effective way to prepare new materials with unique properties e.g. biodegradable thermoplastic elastomers or shape-memory materials. Advantages and limitations affecting future trends in development of biodegradable polymer blends and composites reactive extrusion are also discussed.

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Section: Extruders As Chemical Reactors -Basic Conceptsmentioning

confidence: 99%

Reactive extrusion of bio-based polymer blends and composites – Current trends and future developments

Formela¹,

Zedler²,

Hejna³

et al. 2018

Express Polym. Lett.

108

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show abstract

“…where ½Ti(OR) 4 denotes the inorganic precursor concentration, h 0 prec denotes the zero-shear viscosity of the inorganic precursor, and h 0 pp denotes the zeroshear viscosity of PP matrix. According to equation (12), the zero-shear viscosity of the nanocomposite fluid considering 10 wt% precursors is listed in Table 2. 35 The conversion rate of sol-gel process can be defined as…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…Lots of researchers focused on the heat transfer of nonreactive polymer processing in the mixer using two-dimensional (2D) or three-dimensional (3D) non-isothermal models. [10][11][12][13][14][15] Typically, Campanelli et al 13 developed kinetic, thermodynamic, and rheological equations to calculate batch temperature, torque, and power consumption in an internal mixer. Ishikawa et al 14 developed a 3D steady-state non-isothermal models to analyze the temperature profiles in a nonintermeshing continuous mixer using the FEM.…”

Section: Introductionmentioning

confidence: 99%

Fluid transportation and heat transfer analysis of PP/TiO₂ nanocomposites in an internal mixer

Zhu

Liu

Sun

2019

Advances in Mechanical Engineering

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The internal mixer is an important devise for processing the polymer nanocomposites acting as a chemical reactor. In this article, based on the computational fluid dynamics method, the fluid transportation and heat transfer analysis of solgel reaction processing for Polypropylene (PP)/TiO 2 nanocomposites in the internal batch mixers with single-winged and two-winged Cam rotors were simulated. First, the Lagrangian coherent structure analysis was used to understand the fluid transport properties in the mixers. Then the effect of rotational speeds (ratios) and barrel temperatures on the heat transfer characteristics in the mixers with different rotors was analyzed. Also, the changes of viscous heating and torques of rotors with different thermal conditions in the mixers were discussed. Especially, the relationship between the fluid transportation and heat transfer characteristics was explored. The results show that a big rotor speed ratio can induce great fluid transportation in the left and right mixer chambers based on the Lagrangian coherent structure analysis, and the fluid near the horseshoe map has great folding effect and temperature magnitude. The viscous dissipation, viscous heat generation, and rotor torques in the mixers increase with increasing the rotational speeds and decrease with increasing the barrel temperatures. The mixer with two-winged rotors has higher average temperature, viscous dissipation, viscous heat generation and the torques of rotors values of reactive fluid than that with single-winged rotors.

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“…In a way, although similar in structure and design to the twin-screw extruder, the tri-screw extruder is different from the twin-screw extruder in the flow and mixing mechanisms. From previous researches, it is known that most of particles initial distribution in the inlet plane of the center region fast flow out the outlet and don't pass through any screw in convey element of the tri-screw extruder (Hu et al, 2006;Zhu et al 2013). This special phenomenon may be changed in the kneading disks with the forward or backward stagger angles for the tri-screw extruder.…”

Section: Introductionsmentioning

confidence: 99%

Evaluations of Flow and Mixing Efficiency in the Kneading Disks of a Novel Tri-Screw Extruder

Zhu¹,

Wang²,

Wang³

2016

JAFM

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The forward or backward stagger angles of the kneading disks have great effects on configures of the special center region along axial length in a novel tri-screw extruder. In this paper, the flow and mixing of a nonNewtonian polyethylene in kneading disks of a tri-screw extruder were simulated using three-dimensional finite element modeling based on mesh superposition technique. Three types of kneading disks, neutral stagger, staggered 30° forward and staggered 30° reverse were considered for the tri-screw extruder. The effects of stagger angles of kneading disks on the flow pattern in the tri-screw extruder were investigated. Moreover, at different stagger angles, the dispersive and distributive mixing efficiencies in the kneading disks of the tri-screw extruder and the twin-screw extruder were calculated and compared by means of mean shear rate, stretching rates, maximal stress magnitudes, mixing index, residence time distribution (RTD) and logarithm of area stretch. It is found that increasing the stagger angles decreases the axial velocities of polymer melt in the center region for the tri-screw extruder. The staggered 30° reverse is relatively reasonable for the tri-screw extruder and neutral stagger for the twin-screw extruder for the mixing efficiency. In comparison, the kneading disks in the tri-screw extruder have higher distributive and dispersive mixing efficiencies than those in the twin-screw extruder with the same stagger angles.

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Study of Dynamic Flow and Mixing Performances of Tri-Screw Extruders with Finite Element Method

Cited by 6 publications

References 14 publications

Reactive extrusion of bio-based polymer blends and composites – Current trends and future developments

Reactive extrusion of bio-based polymer blends and composites – Current trends and future developments

Fluid transportation and heat transfer analysis of PP/TiO₂ nanocomposites in an internal mixer

Evaluations of Flow and Mixing Efficiency in the Kneading Disks of a Novel Tri-Screw Extruder

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Study of Dynamic Flow and Mixing Performances of Tri-Screw Extruders with Finite Element Method

Cited by 6 publications

References 14 publications

Reactive extrusion of bio-based polymer blends and composites – Current trends and future developments

Reactive extrusion of bio-based polymer blends and composites – Current trends and future developments

Fluid transportation and heat transfer analysis of PP/TiO2 nanocomposites in an internal mixer

Evaluations of Flow and Mixing Efficiency in the Kneading Disks of a Novel Tri-Screw Extruder

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Fluid transportation and heat transfer analysis of PP/TiO₂ nanocomposites in an internal mixer