Nonisothermal modeling of heat transfer inside an internal batch mixer

Yun Bai, Uttandaraman Sundararaj*, Krishnaswamy Nandakumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


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.

Original languageEnglish
Pages (from-to)2657-2669
Number of pages13
JournalAICHE Journal
Issue number10
StatePublished - Oct 2011
Externally publishedYes


  • Batch mixer
  • Heat transfer
  • Mixing
  • Nonisothermal
  • Polymer processing
  • Simulation


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