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research-article

An iterative solution approach to coupled heat and mass transfer in a steadily fed evaporating water droplet

[+] Author and Article Information
Yigit Akkus

Lyle School of Engineering, Southern Methodist University, Dallas, Texas 75205, USA; ASELSAN Inc., Ankara 06172, Turkey
yakkus@aselsan.com.tr

Dr. Barbaros Cetin

Mechanical Engineering Department, İ.D. Bilkent University, Ankara 06800, Turkey
barbaros.cetin@bilkent.edu.tr

Zafer Dursunkaya

Department of Mechanical Engineering, Middle East Technical University, Ankara 06800, Turkey
refaz@metu.edu.tr

1Corresponding author.

ASME doi:10.1115/1.4042492 History: Received June 21, 2018; Revised December 21, 2018

Abstract

Inspired by the thermoregulation of mammals via perspiration, cooling strategies utilizing continuously fed evaporating droplets has long been investigated in the field, yet a comprehensive modeling capturing the detailed physics of the internal liquid flow is absent. In this study, an innovative computational model is reported, which solves the governing equations with temperature dependent thermo-physical properties in an iterative manner to handle mass and heat transfer coupling at the surface of a constant shape evaporating droplet. Using the model, evaporation from a spherical sessile droplet is simulated with and without thermocapillarity. An uncommon, non-monotonic temperature variation on the droplet surface is captured in the absence of thermocapillarity. Although similar findings were reported in previous experiments, the temperature dip was attributed to a possible Marangoni flow. The present study reveals that buoyancy-driven flow is solely responsible for the non-monotonic temperature distribution at the surface of an evaporating steadily fed spherical water droplet.

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