期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 99, 期 -, 页码 59-70出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2018.07.010
关键词
Salt solution; Heat transfer coefficient; PIV measurements
资金
- National Research Tomsk Polytechnic University [VIU-ISHFVP-184/2018]
Heat transfer, temperature and velocity fields of droplets of water and aqueous salt solutions have been studied. The initial concentration of salt solutions C-01 = 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 (T-w = 83 degrees C), the heat transfer coefficient alpha (for the time t < 150 s) for a drop of water 1.5-2 times exceeds alpha 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 Delta T, the important role is played by thermo-gravitational convection in the droplet (the Rayleigh number R alpha). 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.
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