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首页> 外文期刊>International Journal of Heat and Mass Transfer >Evaporation of closely-spaced interacting droplets arranged in a single row
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Evaporation of closely-spaced interacting droplets arranged in a single row

机译：排成一排的近距离相互作用液滴的蒸发

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摘要

Predictive models of heating and evaporation of fuel droplets in the dense region of sprays are essential to optimize the design of combustion chambers in internal combustion engines. This topic is addressed here, based on an experimental study using lines of equally-spaced droplets evaporating in a high temperature chamber (540 ℃). The experimental set-up allows controlling several key parameters including the droplet size, velocity and the inter-droplet distance. The volume-averaged temperature of the droplets is measured using two-color laser-induced fluorescence, while the droplet size and velocity are deduced from a double-pulse shadowgraphy method. The combination of these measurement techniques allows evaluating the heating and evaporation rates of single-component droplets made of ethanol, n-dodecane, n-decane and isohexane. Nusselt and Sherwood numbers are estimated from the experiments and compared with the existing correlation concerning the isolated droplet, which allows quantifying the effects of droplet interactions on the heat and mass transfers. The droplet spacing appears to have a strong influence on the size and temperature evolutions. However, it also seems necessary to consider the development of a boundary layer around the chain of droplets. As the thickness of the boundary layer increases with the distance from the injector, forced convection has a more and more limited influence on the heat and mass transport. Inside the boundary layer, the transfers are mainly governed by diffusion and convection by the Stefan flow. In a first approach, these effects are partially incorporated in a reduced parameter using the concept of volume of influence. Then, a more detailed study based on numerical simulation is carried out. The Navier-Stokes equations and the vapor transport equation are solved for various periodical arrangements of droplets. A parametric study of the influence of the main characteristic numbers involved allows to infer a correlation for Nusselt and Sherwood numbers which is finally validated against the measurements.
机译：在喷雾的密集区域中燃料滴的加热和蒸发的预测模型对于优化内燃机燃烧室的设计至关重要。在此实验的基础上，通过使用在高温室（540℃）中蒸发的等距液滴线进行实验研究，解决了该主题。实验设置允许控制几个关键参数，包括液滴大小，速度和液滴间距离。使用双色激光诱导的荧光测量液滴的体积平均温度，而液滴的大小和速度则通过双脉冲阴影描记法得出。这些测量技术的结合可以评估由乙醇，正十二烷，正癸烷和异己烷制成的单组分液滴的加热和蒸发速率。从实验中估计Nusselt和Sherwood数，并将其与有关孤立液滴的现有相关性进行比较，从而可以量化液滴相互作用对传热和传质的影响。液滴间距似乎对尺寸和温度演变有很大影响。但是，似乎也有必要考虑在液滴链周围形成边界层。随着边界层的厚度随着与喷射器的距离的增加而增加，强制对流对热量和质量传递的影响越来越有限。在边界层内部，传递主要受Stefan流的扩散和对流控制。在第一种方法中，使用影响量的概念将这些效果部分地合并到减小的参数中。然后，基于数值模拟进行了更详细的研究。对于液滴的各种周期性排列，求解了Navier-Stokes方程和蒸汽传输方程。对所涉及的主要特征数的影响进行的参数研究可以推断Nusselt和Sherwood数的相关性，最后可以根据测量结果对其进行验证。

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  • 作者

    G. Castanet; L. Perrin; O. Caballina; F. Lemoine;

  • 作者单位

    LEMTA, UMR 7563, Universite de Lorraine, Vandceuvre-Les-Nancy 54518, France,LEMTA, UMR 7563, CNRS, Vandceuvre-Les-Nancy 54518, France;

    LEMTA, UMR 7563, Universite de Lorraine, Vandceuvre-Les-Nancy 54518, France,LEMTA, UMR 7563, CNRS, Vandceuvre-Les-Nancy 54518, France;

    LEMTA, UMR 7563, Universite de Lorraine, Vandceuvre-Les-Nancy 54518, France,LEMTA, UMR 7563, CNRS, Vandceuvre-Les-Nancy 54518, France;

    LEMTA, UMR 7563, Universite de Lorraine, Vandceuvre-Les-Nancy 54518, France,LEMTA, UMR 7563, CNRS, Vandceuvre-Les-Nancy 54518, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Droplet evaporation; Interacting droplets; Sprays; Fuel droplet;

    机译：液滴蒸发;相互作用的液滴喷雾剂燃油滴;

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