论文标题

挥发性液滴的蒸发,受到火焰状条件的蒸发

Evaporation of volatile droplets subjected to flame-like conditions

论文作者

Both, Ambrus, Mira, Daniel, Lehmkuhl, Oriol

论文摘要

这项工作评估了喷雾燃烧模拟中经常使用的拉格朗日液滴蒸发模型,目的是确定建模决策对单滴行为的影响。除了更简单的模型外,评估的策略还包括一种简单的方法,可以将Stefan流动效应纳入传热(鸟的校正),这是一种考虑Stefan流量与热量和传播膜的相互作用(Abramzon-Sirignano模型)的方法,以及一种累积热力学(Langmuir-KnudeSen模型)的方法。在各种条件下,通过分析和数值对每种现象的重要性进行量化。在研究条件下,发现忽略Stefan流动的蒸发模型无效。 Langmuir-Knudsen模型也被认为是高温蒸发的不足,而Bird的校正和Abramzon-Sirignano模型被确定为与喷雾燃烧系统的数值研究最相关的。后者是这里研究的最精致的模型,因为它认为雷诺的数量效应超出了Ranz和Marshall的经验相关性,而Marshall得出了低转移率的效果。因此,在这项研究范围内,艾布拉明 - sirignano模型被确定为最替代的状态。

This work assesses Lagrangian droplet evaporation models frequently used in spray combustion simulations, with the purpose of identifying the influence of modeling decisions on the single droplet behavior. Besides more simplistic models, the evaluated strategies include a simple method to incorporate Stefan flow effects in the heat transfer (Bird's correction), a method to consider the interaction of Stefan flow with the heat and mass transfer films (Abramzon-Sirignano model), and a method to incorporate non-equilibrium thermodynamics (Langmuir-Knudsen model). The importance of each phenomena is quantified analytically and numerically under various conditions. Evaporation models ignoring Stefan flow are found to be invalid under the studied conditions. The Langmuir-Knudsen model is also deemed inadequate for high temperature evaporation, while Bird's correction and the Abramzon-Sirignano model are identified as the most relevant for numerical studies of spray combustion systems. Latter is the most elaborate model studied here, as it considers Reynolds number effects beyond the empirical correlation of Ranz and Marshall derived for low-transfer rates. Thus, the Abramzon-Sirignano model is identified as the state of the art alternative in the scope of this study.

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