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The influence of non-ideal vapor-liquid equilibrium on the evaporation of ethanol/iso-octane droplets

Bader, A. and Keller, P. and Hasse, C. (2013):
The influence of non-ideal vapor-liquid equilibrium on the evaporation of ethanol/iso-octane droplets.
In: International Journal of Heat and Mass Transfer, pp. 547 - 558, 64, (0), ISSN 0017-9310, DOI: 10.1016/j.ijheatmasstransfer.2013.04.056, [Online-Edition: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.04.056],
[Article]

Abstract

The present work investigates the differences between ideal and non-ideal vapor–liquid equilibria (VLE) and their effect on vaporization for multicomponent hydrocarbon fuels, which are representative for combustion and gasification. For this purpose, a parametric study is performed for examining non-ideal VLE behavior within a pressure range from 0.5 to 20.0 bar and an ambient temperature range from 0 ° Cto 600 ° C, which are typical vaporization conditions in technical systems. The VLE results are then applied in a 0D single-droplet evaporation model, which can be considered a base model for most CFD applications. The droplet life time and the evaporation rates of the individual liquid components are studied for ideal and non-ideal VLE by varying the pressure, the temperature and the particle Reynolds number. A detailed analysis of the transient processes is performed in binary and ternary diagrams and a separation factor is introduced as a quantitative means of measuring for the effective relative volatility of the species. The observed differences suggest that non-ideal VLE have a significant impact on the droplet evaporation characteristics for complex hydrocarbon mixtures.

Item Type: Article
Erschienen: 2013
Creators: Bader, A. and Keller, P. and Hasse, C.
Title: The influence of non-ideal vapor-liquid equilibrium on the evaporation of ethanol/iso-octane droplets
Language: English
Abstract:

The present work investigates the differences between ideal and non-ideal vapor–liquid equilibria (VLE) and their effect on vaporization for multicomponent hydrocarbon fuels, which are representative for combustion and gasification. For this purpose, a parametric study is performed for examining non-ideal VLE behavior within a pressure range from 0.5 to 20.0 bar and an ambient temperature range from 0 ° Cto 600 ° C, which are typical vaporization conditions in technical systems. The VLE results are then applied in a 0D single-droplet evaporation model, which can be considered a base model for most CFD applications. The droplet life time and the evaporation rates of the individual liquid components are studied for ideal and non-ideal VLE by varying the pressure, the temperature and the particle Reynolds number. A detailed analysis of the transient processes is performed in binary and ternary diagrams and a separation factor is introduced as a quantitative means of measuring for the effective relative volatility of the species. The observed differences suggest that non-ideal VLE have a significant impact on the droplet evaporation characteristics for complex hydrocarbon mixtures.

Journal or Publication Title: International Journal of Heat and Mass Transfer
Volume: 64
Number: 0
Uncontrolled Keywords: Non-ideal vapor liquid equilibrium
Divisions: 16 Department of Mechanical Engineering > Simulation of reactive Thermo-Fluid Systems (STFS)
16 Department of Mechanical Engineering
Date Deposited: 03 Nov 2017 07:45
DOI: 10.1016/j.ijheatmasstransfer.2013.04.056
Official URL: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.04.056
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