Empirical Mass and Kinetic Models for the Flash Evaporation of NaCl–Water Solution
17 Apr 2018-Industrial & Engineering Chemistry Research (American Chemical Society)-Vol. 57, Iss: 18, pp 6115-6122
TL;DR: In this paper, the authors provided empirical mass and kinetic models for flash evaporation of sodium chloride (NaCl) aqueous solution based on experimental phenomena, and a statistical method proved the mass model is well posed.
Abstract: This paper attempts to provide empirical mass and kinetic models for the flash evaporation of sodium chloride (NaCl) aqueous solution based on experimental phenomena. The models have nine parameters and six affecting factors including initial temperature, operation pressure, NaCl mass fraction, solution depth, evaporator diameter and time. On the basis of a large number of flash evaporation experimental data from various literatures, the mass model parameters were optimized and validated. After optimization of the model parameters with 283 sets of literature experimental data, the average relative error between the model values and the experimental data is about 5.7%. And a statistical method proved the mass model is well posed. The verification with other 215 sets of literature experimental data showed the mass model is in good agreement with flash evaporation phenomena, and the average relative error between the model values and the experimental data is about 8.3%. Then, the kinetic model of flash evapo...
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TL;DR: In this article, it was concluded that molecular collision and heat transfer limitations can have a considerable influence on experimental evaporation rates and thus apparent evapore coefficients, however, it now seems unlikely that molecular structure has a major effect on this coefficient.
280 citations
TL;DR: In this paper, a theoretical approach based on the transition probability concept of quantum mechanics, called statistical rate theory (SRT), is used to develop an expression for predicting the evaporation flux.
Abstract: Recent measurements of the conditions existing at the interface of an evaporating liquid have found that the temperature approximately one mean free path from the interface in the vapor was higher than the temperature of the liquid at the interface. The measured temperature discontinuity at the interface is in the opposite direction of that predicted by several recent studies based on classical kinetic theory. A theoretical approach based on the transition probability concept of quantum mechanics, called statistical rate theory (SRT), is used herein to develop an expression for predicting the evaporation flux. The expression obtained is free of any fitting parameters. When applied to predict the conditions at which a particular value of the evaporation flux is expected and the result compared with the measurements at 15 different experimental conditions, it is found that the SRT expression accurately predicts the conditions.
188 citations
TL;DR: In this paper, the motion of a vapor gas in contact with interphase surfaces is studied on the basis of kinetic theory of gases, and the mass and energy fluxes are determined from the condition of the vapor far away from the interfaces.
Abstract: The motion of a vapor gas in contact with interphase surfaces is studied on the basis of kinetic theory of gases. The mass and energy fluxes are determined from the condition of the vapor far away from the interfaces. The result for a vapor gas between two interfaces shows that the temperature gradient in the vapor is opposite in sign to the externally maintained temperature difference.
179 citations
TL;DR: In this article, an experimental study of the flash evaporation phenomenon of a water film was carried out with an initial water height of 15 mm, superheats ranging from 1 to 35 K and initial temperatures from 30 to 75 °C.
96 citations
TL;DR: In this article, the influence of the initial water height and the depressurization rate on the flash evaporation of a water film was investigated, and dimensionless correlations between these parameters were proposed.
90 citations