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 language | English |
|---|---|
| Pages (from-to) | 59-70 |
| Number of pages | 12 |
| Journal | Experimental Thermal and Fluid Science |
| Volume | 99 |
| DOIs | |
| Publication status | Published - 1 Dec 2018 |
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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
Cite this
The influence of key factors on the heat and mass transfer of a sessile droplet. / Volkov, R. S.; Strizhak, P. A.; Misyura, S. Y.; Lezhnin, S. I.; Morozov, V. S.
In: Experimental Thermal and Fluid Science, Vol. 99, 01.12.2018, p. 59-70.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The influence of key factors on the heat and mass transfer of a sessile droplet
AU - Volkov, R. S.
AU - Strizhak, P. A.
AU - Misyura, S. Y.
AU - Lezhnin, S. I.
AU - Morozov, V. S.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - 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.
AB - 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.
KW - Heat transfer coefficient
KW - PIV measurements
KW - Salt solution
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UR - http://www.scopus.com/inward/citedby.url?scp=85050681329&partnerID=8YFLogxK
U2 - 10.1016/j.expthermflusci.2018.07.010
DO - 10.1016/j.expthermflusci.2018.07.010
M3 - Article
VL - 99
SP - 59
EP - 70
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
SN - 0894-1777
ER -