Development of a novel two-zone model for the heating of an evaporating liquid droplet

作     者：Thielens, Martin Merci, Bart Beji, Tarek 

作者机构：Univ Ghent Dept Struct Engn & Bldg Mat Ghent Belgium 

出 版 物：《FIRE SAFETY JOURNAL》 (消防安全杂志)

年 卷 期：2021年第120卷

页      面：103019-103019页

核心收录：

学科分类：08[工学] 083305[工学-城乡生态环境与基础设施规划] 081403[工学-市政工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0814[工学-土木工程] 0833[工学-城乡规划学] 

基　　金：Research Foundation - Flanders (FWO) [1182919N] 

主　　题：Evaporation Modelling Two-zone Liquid droplet Suppression 

摘      要：A novel two-zone model is implemented, within an in-house code, for the heating of an evaporating droplet. While it is not yet possible to fully assess and validate the novel model due to lack of available detailed experimental data, the concept is described. Differences compared to the common isothermal model are explained. Firstly, a quantitative assessment is performed, using experimental datasets where a suspended water droplet is exposed to a hot air flow. Secondly, the behavior of the novel model is examined over a wider range of conditions in terms of air velocity, ambient temperature and initial droplet diameter. The novel model predicts droplet lifetimes and saturation temperatures that are similar to the isothermal model. Nevertheless, the results also show that, during the early stages, the cooling of the surrounding gas due to the evaporation of the droplet is more pronounced with the two-zone model. During a second stage, the evaporation term is slightly lower than with the isothermal model. The available data do not allow to fully assess which result is closer to reality, but the important observation is that there exist differences. These differences increase with higher ambient temperature, relative velocity or initial diameter.