Size measurement of dry ice particles produced from liquid carbon dioxide

Yi Hung Liu, Graham Calvert, Colin Hare, Mojtaba Ghadiri, Shuji Matsusaka

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

The formation of dry ice particles in a jet flow has been studied experimentally. The particles were produced by rapid expansion of liquid carbon dioxide through a nozzle, based on the Joule-Thomson effect. Their size distribution was measured by a laser diffraction method. The experimental results showed that the primary dry ice particles ejected from the nozzle were about 1μm in mass median diameter. However, they grew initially in the jet flow and then became smaller due to sublimation. As a result, a bimodal size distribution was formed at increased distances from the nozzle outlet. The presence of a thermally insulated tube at the outlet of the expansion nozzle enhanced the agglomeration of the particles, whereby agglomerates of about 100μm in mass median diameter were recorded. The agglomeration process is considered to take place by the simultaneous processes of particle deposition and reentrainment; i.e. agglomerated particles are reentrained from the layer of dry ice particles deposited on the tube walls. The agglomerate size decreased with increasing flow velocity, due to the greater detachment force applied to the deposition layer. Therefore, the flow velocity was found to be an important parameter influencing the agglomeration of dry ice particles.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalJournal of Aerosol Science
Volume48
DOIs
StatePublished - Jun 2012

Keywords

  • Agglomeration
  • Deposition
  • Dry ice particle
  • Jet flow
  • Particle size measurement
  • Reentrainment

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