Combined effect of acoustic field and gas absorption on evaporation of slurry droplet

Yehonatan David Pour, Boris Krasovitov, Andrew Fominykh, Ziba Hashemloo, Abdolreza Kharaghani, Evangelos Tsotsas, Avi Levy

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we developed a model of convective heat and mass transfer of an acoustically levitated slurry droplet that evaporates in an atmosphere of air, water vapor, and soluble gas. The advanced model considered the effects of acoustic streaming, forced convection, and non-isothermal gas absorption on the evaporation rate of a liquid droplet containing small solid particles. It is shown that the time of porous shell formation decreases with the increase of sound pressure level (SPL) and increases with the increase in frequency. Adding soluble gas to the gaseous phase shortens the time required for porous shell formation during slurry droplet drying. As shown by numerical calculations, in a gas mixture containing air with an ammonia content of 30%, at a temperature of 293 K and a humidity of 50%, with an acoustic field frequency of 2π·45 kHz and an SPL of 140 dB, the time of porous shell formation of a silica-water slurry droplet with the initial radius of 250 µm is about half shorter than that in a gas mixture not containing an active gas. The prediction of the developed model was in good agreement with the experimental results available in literature.

Original languageEnglish
JournalDrying Technology
DOIs
StateAccepted/In press - 1 Jan 2022

Keywords

  • Slurry droplet
  • acoustic levitation
  • acoustic streaming
  • droplet evaporation
  • gas absorption
  • heat and mass transfer

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Physical and Theoretical Chemistry

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