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On the Use of a Well Stirred Reactor to Study Soot Inception.


pdf icon On the Use of a Well Stirred Reactor to Study Soot Inception. (296 K)
Manzello, S. L.; Mulholland, G. W.; Donovan, M.; Tsang, W.; Park, K.; Zachariah, M. R.; Stouffer, S. D.

Poster Session II and Reception;

Combustion Institute/Western States, Central States and Eastern States. Fourth (4th) Joint Meeting of the U.S. Sections. Hosted by The Eastern States Section of the Combustion Institute and Drexel University. Poster Session II and Reception. March 20-23, 2005, Philadelphia, PA, 1-6 pp, 2005.

Keywords:

combustion; soot; nuclear reactors; polycyclic aromatic hydrocarbons; size distribution; exhasut gases; probes

Abstract:

A well stirred reactor (WSR) followed by a plug flow reactor (PFR) is being used to study polycyclic aromatic hydrocarbon (PAH) growth and soot inception. Soot size distributions were measured using a dilution probe followed by a nano-differential mobility analyzer (Nano-DMA). A rapid insertion probe was fabricated to thermophoretically collect particles from the reactor for transmission electron microscopy (TEM) analysis. Results are presented on the: (1) effect on the equivalence ratio of the soot size distributions obtained from the Nano-DMA for fixed dilution ratio (2) effect of dilution ratio on the soot size distributions obtained from the Nano-DMA for fixed equivalence ratio, and (3) comparison of soot size distributions obtained from the rapid insertion/TEM analysis and the Nano-DMA. The particle sizing results from the Nano-DMA and the rapid insertion/TEM analyses suggested that condensation of low vapor pressure species was occurring during the dilution process. Our size distribution measurements demonstrate that the mixing conditions in the flame zone affect whether or not a nucleation mode was detected in the size distribution.