Nonisothermal modeling of heat transfer inside an internal batch mixer

Bai, Yu; Sundararaj, Uttandaraman; Nandakumar, K.

doi:10.1002/aic.12484

Cited by 13 publications

(13 citation statements)

References 32 publications

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“…Malkin developed a mathematical model to assess the internal heat dissipation and its effect on mixing quality of two rotor mixers by assuming a fully filled chamber. A similar fully filled mixing chamber was modeled by Bai et al to study the temperature distribution and heat transfer mechanism. The effect of rotor speed on distributive and dispersive mixing was analyzed by Poudyal et al by developing a 2D non‐isothermal model in a partially filled chamber.…”

Section: Introductionmentioning

confidence: 99%

3D numerical investigations of the effect of fill factor on dispersive and distributive mixing of rubber under non‐isothermal conditions

Ahmed

Chandy

2018

Polymer Engineering & Sci

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Three-dimensional, non-isothermal, transient computational fluid dynamics simulations are conducted for rubber mixing with a set of two-wing rotors in a partially filled chamber. The main objective is to analyze the effect of different fill factors of rubber on dispersive and distributive mixing characteristics by simulating 15 revolutions of the rotors rotating at 20 rpm. 60%, 70%, 75%, and 80% are the four different fill factors chosen for the study. An Eulerian multiphase model is employed to simulate two different phases, rubber and air, and the volume of fluid technique is used to calculate the free surface between two phases, in addition to the continuity, momentum and Energy equations. To characterize non-Newtonian, highly viscous rubber, shear rate and temperature dependent Carreau-Yasuda model has been used. A set of more than 3,600 massless particles are injected after a certain period of time to calculate several quantities in terms of dispersive and distributive mixing. Both the Eulerian and Lagrangian results showed that, fill factors between 70% and 80% presented the most reasonable and efficient mixing scenario, thus exhibiting the best dispersive and distributive mixing characteristics combined. POLYM. ENG. SCI., 59:535-546, 2019.

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Section: Introductionmentioning

confidence: 99%

3D numerical investigations of the effect of fill factor on dispersive and distributive mixing of rubber under non‐isothermal conditions

Ahmed

Chandy

2018

Polymer Engineering & Sci

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“…a represents the width of the transition region between 0  and the power-law n. In this work, the parameters of the Carreau-Yasuda model for the PE melts at 463 K are described in Table 1 (Bai et al, 2011). …”

Section: Methodsmentioning

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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“…8 Especially, comparison with traditional polymer processing in twin screw extruders, the nanocomposites processing in the mixer required higher shears rate and longer residence time distributions to obtain nanoscale dispersion. 9 Therefore, understanding the temperature distribution rules in the internal mixer is important to carefully control rates of ongoing chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

“…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. Bai et al 9 established a transient and non-isothermal model to simulate the heat transfer process in an internal mixer using commercial software, Polyflow. The temperature distribution and the heat transfer between polymer melt and mixer wall were obtained.…”

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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Nonisothermal modeling of heat transfer inside an internal batch mixer

Cited by 13 publications

References 32 publications

3D numerical investigations of the effect of fill factor on dispersive and distributive mixing of rubber under non‐isothermal conditions

3D numerical investigations of the effect of fill factor on dispersive and distributive mixing of rubber under non‐isothermal conditions

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

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

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Nonisothermal modeling of heat transfer inside an internal batch mixer

Cited by 13 publications

References 32 publications

3D numerical investigations of the effect of fill factor on dispersive and distributive mixing of rubber under non‐isothermal conditions

3D numerical investigations of the effect of fill factor on dispersive and distributive mixing of rubber under non‐isothermal conditions

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

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

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