Modeling the Distributive Mixing in an Internal Batch Mixer

Hutchinson, B. C.; Rios, Antoine C.; Osswald, Tim A.

doi:10.3139/217.1546

Cited by 11 publications

(6 citation statements)

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“…The flow field and mixing performance of an internal batch mixer have been studied by various researchers under isothermal and nonisothermal conditions 19–27. Various viscous models have been used to characterize the non‐Newtonian behavior of a polymer melt, but most of the work used 2‐D geometry and the axial flow in the rotor axis directions was neglected.…”

Section: Introductionmentioning

confidence: 99%

A novel approach using differential scanning calorimetry to investigate the dissolved state in aqueous solutions of polymers used for papermaking

Yamauchi

Tamai

2003

J of Applied Polymer Sci

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ABSTRACT:The size and conformations of dissolved polymer molecules of polyethylene glycol (PEG) in 5% aqueous solutions were examined through the use of differential scanning calorimetry (DSC). As long as the freezable bound water is considered to be the water enclosed by the entangled polymer chains in the solution, the appearance of the characteristics of a polymer begins to occur at a degree of polymerization (DP) between 11 and 21 and is largely completed at a DP of about 50. Assuming that the peak temperature of the DSC curve for the freezable bound water indicates the size of the entangled molecular coil, the lowering of the peak temperature with a decrease of molecular weight (MW) suggests a decrease in the size of the entangled molecular coil. The linear relationship between the peak temperature and the reciprocal of the number-average MW suggests melting point depression as a plausible mechanism for the peak temperature lowering.

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Section: Introductionmentioning

confidence: 99%

A novel approach using differential scanning calorimetry to investigate the dissolved state in aqueous solutions of polymers used for papermaking

Yamauchi

Tamai

2003

J of Applied Polymer Sci

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“…[19][20][21][22][23][24][25][26][27] Various viscous models have been used to characterize the non-Newtonian behavior of a polymer melt, but most of the work used 2-D geometry and the axial flow in the rotor axis directions was neglected. Nonisothermal 3-D modeling for a Banbury-type mixer was first studied by Kim and White 28 using the hydrodynamic lubrication theory and a rotating reference frame.…”

Section: Introductionmentioning

confidence: 99%

Nonisothermal modeling of heat transfer inside an internal batch mixer

2010

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A nonisothermal transient process of temperature increase due to viscous heating was simulated for a 69 cm 3 internal batch mixer (BM) using a computational fluid dynamics (CFD) software, Polyflow 3.9 form ANSYS, Inc., to obtain the temporal temperature distribution and characterize the heat transfer between polymer melt and mixer wall. The melt temperature obtained from simulation was verified with experiments. Starting from a uniform temperature of 463 K, when a rotation speed of 5.24 rad/s is imposed, viscous heating caused a maximum temperature rise of 3 K for a polyethylene (PE) resin, and 6 K for a polystyrene (PS) resin. The transient flow fields inside the batch mixer were characterized with velocity profiles and a mixing index parameter, which show that laminar flow dominates inside the mixer while a small percentage of elongational flow, converging flow, and recirculation flow is also present.

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“…3 A substantial amount of simulation work has been conducted on internal batch mixers, which has enabled the characterization of melting 4 and both distributive 2,5 and dispersive [5][6][7][8] mixing. Wong and Manas-Zloczower 2 performed simulation work on an internal batch mixer, characterizing the extent of mixing in relation to rotor speed ratio and initial positions.…”

Section: Introductionmentioning

confidence: 99%

Simulation and visualization of flow in a new miniature mixer for multiphase polymer systems

Breuer¹,

Chen²,

Lin³

et al. 2005

J of Applied Polymer Sci

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A newly designed mixer, the Alberta polymer asymmetric minimixer (APAM), was compared to the MiniMAX molder with flow simulation and flow visualization techniques to evaluate the performance of the mixers. The APAM has a unique, asymmetric design consisting of a varying clearance between the rotor blade tips and the cup wall, which enables the material to be squeezed, stretched, and kneaded in high-shear and converging zones. Flow simulation showed that substantial folding and axial movement occurred in this mixer and that the pressure and velocity profiles exhibited high values at the rotor tip with the smallest rotor tip/cup clearance. In contrast, the MiniMAX molder had very simple flow patterns, which were insufficient to induce good dispersive and distributive mixing. These results concurred with those from an earlier work that studied the structure of blends and nanocomposites processed in the APAM compared to other polymer processing equipment.

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Modeling the Distributive Mixing in an Internal Batch Mixer

Cited by 11 publications

References 0 publications

A novel approach using differential scanning calorimetry to investigate the dissolved state in aqueous solutions of polymers used for papermaking

A novel approach using differential scanning calorimetry to investigate the dissolved state in aqueous solutions of polymers used for papermaking

Nonisothermal modeling of heat transfer inside an internal batch mixer

Simulation and visualization of flow in a new miniature mixer for multiphase polymer systems

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