Impingement mixing in reaction injection molding

Ly James Lee*, Julio M. Ottino, William E. Ranz, Christopher W. Macosko

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


Impingement mixing is the unique feature of the reaction injection molding (RIM) process but mixheads are largely designed by trial and error. To visualize the impingement process we have taken high speed photographs. To characterize mixing quality we have followed adiabatic temperature rise of mixtures, varying Reynolds number, mixhead geometry and the reaction rate. These results are examined in terms of a simplified model which includes both fluid mechanical and polymerization aspects of the problem.

Original languageEnglish
Pages (from-to)868-874
Number of pages7
JournalPolymer Engineering & Science
Issue number13
StatePublished - Sep 1980


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