期刊
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
卷 159, 期 -, 页码 -出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2020.106602
关键词
Heat transfer; Evaporation rate; Crystallization rates; Salt solutions
Experimental studies on evaporation, crystallization, and heat transfer in a droplet of NaCl/H2O solution have shown that supersaturation and heating of the wall significantly affect the process. Four characteristic modes of evaporation and crystallization are distinguished, with the ratio of the crystallization rate to the evaporation rate being highly variable and regulated by Marangoni convection. The data obtained provide insights for the development of high-temperature crystallization concepts in the presence of intense Marangoni flow.
Evaporation, crystallization and heat transfer in a droplet of NaCl/H2O solution have been studied experimentally. Crystallization began at the edges of the droplet at solution supersaturation S = 1.94 (S = C-sup/C-sat, where C-sup is the salt concentration in a metastable region (supersaturation), and C-sat corresponds to saturation), which is noticeably higher than the previously obtained supersaturation for the droplet, micmcapillary, and when using surfactant. When the droplet evaporated on the heated wall, the supersaturation of the salt solution was noticeably higher than when evaporating without heating. Four characteristic modes of evaporation and crystallization are distinguished. The ratio of the crystallization rate to the evaporation rate (j(cr)/j(ev)) may be both substantially greater and less than one. It is shown that the heat transfer and the crystallization rate are regulated by Marangoni convection. The data obtained are of interest for the development of modern concepts of high-temperature crystallization in the presence of intense Marangoni flow.
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