The role of convection in gas and liquid phases at droplet evaporation

Стрижак, П. А.; Волков, Р. С.; Misyura, S.Y.; Lezhnin, S. I.; Морозов, В. С.

doi:10.1016/j.ijthermalsci.2018.08.031

Cited by 62 publications

(17 citation statements)

References 52 publications

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“…The particles size was less than 1 μm. A detailed PIV method for the velocity measuring in a droplet of aqueous salt solution was presented in 31,32 .…”

Section: Experimental Methodsmentioning

confidence: 99%

“…When describing evaporation and crystallization, it is necessary to estimate not only the rate of heat transfer in the liquid, but also convection in the gas phase [28][29][30] , which significantly increases the evaporation rate. The role of free convection in salt solution drops decreases with increasing evaporation time, since the salt concentration increases [31][32][33] . In this case, the heat transfer coefficient may have an extremum when approaching the crystallization.…”

mentioning

confidence: 99%

“…The Marangoni flow on the surface of a water drop at room temperature is suppressed by micron particles of dirt, which may be a surfactant 33 . With increasing wall temperature and heat flux, the thermal and the solutal Marangoni forces lead to intensive circulation of salt solution inside the droplet 31 .…”

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confidence: 99%

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The crystallization behavior of the aqueous solution of CaCl2 salt in a drop and a layer

Misyura

2020

Sci Rep

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Non-isothermal evaporation during crystallization of CaCl2 salt in a droplet and a thin layer on a hot wall has been investigated experimentally. The growth of salt crystal hydrates (CaCl2·2H2O) on the interface has been studied. It has been found that the change in the initial salt concentration leads to different crystallization rates. The crystallization rate on the droplet interface is many times lower than for a thin layer. The description of crystallization in the salt solution droplet should take into account the crystallization anisotropy, which is associated with the direction of crystallization. The crystallization rate along the contact line of the droplet is many times higher than in the direction of the droplet radius. For a long time of crystallization, the area of the crystal film (outside the drop) increases several times. Four characteristic modes of crystallization to a drop of salt solution have been distinguished. When modeling crystallization, it is necessary to take into account multiple changes in the growth rate of salt crystallohydrates over time, as well as the anisotropic nature of crystallization.

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“…The particles size was less than 1 μm. A detailed PIV method for the velocity measuring in a droplet of aqueous salt solution was presented in 31,32 .…”

Section: Experimental Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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The crystallization behavior of the aqueous solution of CaCl2 salt in a drop and a layer

Misyura

2020

Sci Rep

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“…Evaporation of gas-droplet flows are widely used in practice in technical apparatuses [24,25]. Modern contactless methods for visualization of instantaneous velocity and temperature fields (PIV) and Planar Laser Induced Fluorescence (PLIF)) serve to a deeper understanding of the effect of free convection when the rate of evaporation and heat transfer decrease [26,27]. To date, there is little data on how the behavior of heat transfer coefficient in a thin layer of an aqueous solution of salt, when the evaporation of the layer occurs at high temperatures and in the presence of intense gas convection.…”

Section: Introductionmentioning

confidence: 99%

The dynamics of nucleate boiling of salt solutions at a high heat flux

Морозов

Elistratov

2019

EPJ Web Conf.

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In this paper, experimental results are obtained for the desorption of layers of aqueous salt solutions of LiBr and CaCl 2 at a temperature of nucleate boiling on a horizontal heating surface. The wall temperature is 130 °C. The required volume of the solution with a given mass concentration is placed on the working surface using the Thermo Scientific dispensers. After that, the desorption rate continuously decreases over time. A decrease in the wall temperature leads to a drop in the intensity of the bubbling boiling. The effect of gas convection during evaporation and thermal radiation is small in comparison with the heat of evaporation.

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“…The nonisothermal desorption of aqueous salt solutions at a temperature below boiling was studied in [3][4][5]. Evaporation of pure liquids differs significantly from solutions [6][7][8][9]. An increase in the salt concentration in the liquid layer leads to a significant decrease in the desorption rate.…”

Section: Introductionmentioning

confidence: 99%

Nonisothermal desorption at nucleate boiling in a layer of aqueous salt solution

Морозов

Elistratov

2019

EPJ Web Conf.

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This paper presents the results of experimental studies of nonisothermal desorption at nucleate boiling of layers of aqueous salt solutions of LiBr and CaCl 2 . The height of the layers is 2.8 mm. The wall temperature is 120 °C. The drop in the temperature of the interfacial surface (T s ) for salt solutions and distillate is associated with low thermal conductivity of the metal wall (titanium) and intense heat flow at nucleate boiling. A heat balance for a free liquid interface has been worked out. In 75 seconds after the beginning of evaporation, the heat flux for aqueous becomes quasi-permanent, and for aqueous salt solutions of CaCl 2 and LiBr, the heat flux continuously decreases with time. This is due to the increase in the salt concentration in the solution and the drop in the equilibrium partial pressure of the vapor.

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The role of convection in gas and liquid phases at droplet evaporation

Cited by 62 publications

References 52 publications

The crystallization behavior of the aqueous solution of CaCl2 salt in a drop and a layer

The crystallization behavior of the aqueous solution of CaCl2 salt in a drop and a layer

The dynamics of nucleate boiling of salt solutions at a high heat flux

Nonisothermal desorption at nucleate boiling in a layer of aqueous salt solution

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