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 journalArticle

24 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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