Experimental study of water evaporation rate, at the surface of aqueous solution, under the effect of a discontinuity of chemical potential – Effect of water activity and air pressure
| Autor: | Jean-Claude Bénet, Francois Ouedraogo, Fabien Cherblanc, Samuel Ouoba |
|---|---|
| Přispěvatelé: | Biomécanique des Interactions et de l'Organisation des Tissus et des Cellules (BIOTIC), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Ki-Zerbo [Ouagadougou] (UJZK), Université Polytechnique Nazi Boni Bobo-Dioulasso (UNB) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Water activity General Chemical Engineering Evaporation Aerospace Engineering Thermodynamics 02 engineering and technology transient method 01 natural sciences 010305 fluids & plasmas [SPI]Engineering Sciences [physics] Discontinuity (geotechnical engineering) 020401 chemical engineering 0103 physical sciences water activity gas pressure chemical potential 0204 chemical engineering Total pressure Fluid Flow and Transfer Processes Aqueous solution Atmospheric pressure Mechanical Engineering Partial pressure 6. Clean water Nuclear Energy and Engineering surface evaporation rate Water vapor |
| Zdroj: | Experimental Thermal and Fluid Science Experimental Thermal and Fluid Science, Elsevier, 2021, 121, pp.110233. ⟨10.1016/j.expthermflusci.2020.110233⟩ |
| ISSN: | 0894-1777 |
| Popis: | International audience; The aim of this communication is to analyse the influence of water activity and total pressure on water evaporation. The system is composed of liquid and gas phases, separated by a plane surface, contained in a cylinder whose volume is regulated by a piston. Water activity is regulated by saturated salt solutions and pressure by the piston. The experimental device and procedures were defined to limit the temperature variation at the interface. A transient method is used. From a steady state, a volume increment is imposed; the resulting non-equilibrium leads to an increase in the partial pressure of water vapour to the equilibrium pressure imposed by the solution. Numerical calculation shows little variation in temperature in the gas-liquid interface under the experimental conditions. An evaporation model is adopted taking into account chemical potential discontinuity at the interface. The surface flux evaporation and chemical potential jump at the interface are deducted from the total pressure recording. In the neighbourhood of equilibrium, the surface flux of phase change is shown to be proportional to the chemical potential jump. The surface coefficient of evaporation increases with the total pressure of the gas phase and water activity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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