Experimental study on spreading and evaporation of inkjet printed pico-liter droplet on a heated substrate

Taewoong Lim, Sewoon Han, Jaewon Chung, Jin Taek Chung, Seunghwan Ko, Costas P. Grigoropoulos

Research output: Contribution to journalArticlepeer-review

168 Citations (Scopus)


In this work, the spreading and evaporation of 2-70 pL droplet (17-50 μm diameter) of water and ethylene glycol jetted by drop-on-demand piezo-driven jetting head on the heated substrate are studied. According to the experimental results, the interfacial oscillation phenomena of water droplet whose Ohnesorge number (Oh) is about 10-2 is similar to that in inviscid impact driven region, while that of ethylene glycol droplet (Oh ≈10-1) is similar to that in highly viscous impact driven region followed by capillary driven extra spreading. In addition, various time scales used for nano/micro-liter droplets agree well with the times for interfacial oscillation, viscous damping, extra wetting, and evaporation in pico-liter droplets. In the case of water droplet, the spreading processes end before the evaporation becomes significant. However, in the case of highly viscous ethylene glycol droplet, the extra wetting overlaps the evaporation at high temperature.

Original languageEnglish
Pages (from-to)431-441
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Issue number1-2
Publication statusPublished - 2009 Jan 15

Bibliographical note

Funding Information:
Financial support to Korea University by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) under Grant No. KRF-2006-331-D00044 and by the Korea University Grant and to University of California, Berkeley, by the U.S. National Science Foundation under Grant CTS-0417563 is gratefully acknowledged.


  • Droplet
  • Evaporation
  • Flexible electronics
  • Inkjet
  • Spreading

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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