Heat transfer of aqueous salt solutions during evaporation on a structured heated wall

Abstract

Evaporation and heat transfer of the layers of water and aqueous salt solutions (H₂O/LiBr, H₂O/CaCl₂, H₂O/LiCl) have been studied experimentally. Evaporation rate is greater for a structured wall than for a smooth one. When simulating droplet evaporation and heat transfer, it is necessary to take into account free convection of air and vapor. There is a change of the heat transfer coefficient for salt solutions layers on the structured surface with the presence of an extremum. The largest value of the heat transfer coefficient α on the structured surface corresponds to water for the final stage of evaporation. For salt solutions, α is lower than that of water. The maximum excess of heat transfer coefficient of micro-structured wall above the smooth wall (20–25%) corresponds to the maximum height of the liquid layer for the initial period of evaporation. With increasing time, the excess is reduced.

Original language	English
Pages (from-to)	7-11
Number of pages	5
Journal	International Communications in Heat and Mass Transfer
Volume	96
DOIs	https://doi.org/10.1016/j.icheatmasstransfer.2018.05.015
Publication status	Published - 1 Aug 2018

Keywords

Aqueous salt solution
Evaporation rate
Heat transfer coefficient
Structured surface

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Chemical Engineering(all)
Condensed Matter Physics

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10.1016/j.icheatmasstransfer.2018.05.015

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Misyura, S. Y. (2018). Heat transfer of aqueous salt solutions during evaporation on a structured heated wall. International Communications in Heat and Mass Transfer, 96, 7-11. https://doi.org/10.1016/j.icheatmasstransfer.2018.05.015

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title = "Heat transfer of aqueous salt solutions during evaporation on a structured heated wall",

abstract = "Evaporation and heat transfer of the layers of water and aqueous salt solutions (H2O/LiBr, H2O/CaCl2, H2O/LiCl) have been studied experimentally. Evaporation rate is greater for a structured wall than for a smooth one. When simulating droplet evaporation and heat transfer, it is necessary to take into account free convection of air and vapor. There is a change of the heat transfer coefficient for salt solutions layers on the structured surface with the presence of an extremum. The largest value of the heat transfer coefficient α on the structured surface corresponds to water for the final stage of evaporation. For salt solutions, α is lower than that of water. The maximum excess of heat transfer coefficient of micro-structured wall above the smooth wall (20–25%) corresponds to the maximum height of the liquid layer for the initial period of evaporation. With increasing time, the excess is reduced.",

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AB - Evaporation and heat transfer of the layers of water and aqueous salt solutions (H2O/LiBr, H2O/CaCl2, H2O/LiCl) have been studied experimentally. Evaporation rate is greater for a structured wall than for a smooth one. When simulating droplet evaporation and heat transfer, it is necessary to take into account free convection of air and vapor. There is a change of the heat transfer coefficient for salt solutions layers on the structured surface with the presence of an extremum. The largest value of the heat transfer coefficient α on the structured surface corresponds to water for the final stage of evaporation. For salt solutions, α is lower than that of water. The maximum excess of heat transfer coefficient of micro-structured wall above the smooth wall (20–25%) corresponds to the maximum height of the liquid layer for the initial period of evaporation. With increasing time, the excess is reduced.

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