Reynolds numbers influence the directionality of self-propelled microjet engines in the 10-4 regime

Guanjia Zhao, Nam Trung Nguyen, Martin Pumera

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The motion directionality of self-propelled bubble-jet microengines is influenced by their velocities and/or viscosity of the media in which they move. The influence of the fuel concentration from 1 to 3 wt% of H2O 2 in 0.5% steps and of the glycerol fraction from 0 to 64% in aqueous solution on the directionality of the microjets motions is examined systematically. We show that with decreasing Reynolds numbers of the system (that is, with increasing viscosity or decreasing velocity of the microjets), the directionality of the motion shifts from circular to linear motion. This translates to a shorter travel time towards a designated target for the microjets despite moving at a slower speed, since the movements are linear instead of circular. We show that such dependence of trajectories of microjets on Re is a general issue. This observation has a strong implication for the real-world applications of microjets.

Original languageEnglish
Pages (from-to)7277-7283
Number of pages7
JournalNanoscale
Volume5
Issue number16
DOIs
Publication statusPublished - 2013 Aug 21

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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