The influence of key factors on the heat and mass transfer of a sessile droplet

R. S. Volkov, P. A. Strizhak, S. Y. Misyura, S. I. Lezhnin, V. S. Morozov

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Heat transfer, temperature and velocity fields of droplets of water and aqueous salt solutions have been studied. The initial concentration of salt solutions C01 = 30% in accordance with advanced technological applications. It is shown that the heat flux q for a water droplet is several times higher than for salt solutions. During the droplet evaporation, this difference increases, since q for aqueous salt solutions is many times reduced. While maintaining the wall temperature under the drop quasi-constant (Tw = 83 °C), the heat transfer coefficient α (for the time t < 150 s) for a drop of water 1.5–2 times exceeds α for the salt solution, and is 7 times higher for water than for the salt solution at t = 280 s. Using PIV measurements the liquid velocity fields have been obtained; and for the first time it has been shown that only for very small times and at high ΔT, the important role is played by thermo-gravitational convection in the droplet (the Rayleigh number Ra). But already for t > 10 s, the thermal and solutal Marangoni flows have a greater influence on the flow in a drop of the salt solution.

Original languageEnglish
Pages (from-to)59-70
Number of pages12
JournalExperimental Thermal and Fluid Science
Volume99
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • Heat transfer coefficient
  • PIV measurements
  • Salt solution

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Nuclear Energy and Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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