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

被引：49

作者：

Bader, A. ^{[1
]}

Keller, P. ^{[2
]}

Hasse, C. ^{[2
]}

机构：

[1] Tech Univ Bergakad Freiberg, Dept Energy Proc Engn & Chem Engn, Freiberg, Germany

[2] Tech Univ Bergakad Freiberg, Dept Energy Proc Engn & Chem Engn, Chair Numer Thermofluid Dynam, Freiberg, Germany

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2013年 / 64卷

关键词：

Non-ideal vapor liquid equilibrium; Multicomponents; Droplet evaporation; Droplet life time; Separation factor; Ternary diagram; QUASI-DISCRETE MODEL; FUEL; VAPORIZATION; COMBUSTION; MIXTURES; DIESEL; BINARY; OIL;

D O I：

10.1016/j.ijheatmasstransfer.2013.04.056

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

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 degrees C to 600 degrees 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. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：547 / 558

页数：12

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