• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Upward vs downward injection of droplets for the optimization of a radiative shield
【24h】

Upward vs downward injection of droplets for the optimization of a radiative shield

机译：向上或向下注射液滴以优化辐射屏蔽

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A numerical and experimental study of a spray has been carried out at the laboratory scale, focusing on the comparison between downward and upward injection situations. The simulation has been carried out thanks to a dedicated numerical code addressing the two-phase flow with an Eulerian-Lagrangian approach, and treating the radiative transfer with a Monte Carlo method. The experimental setup involves a FT1R spectrometer and an IR camera, both characterizing simultaneously the spectral attenuation through the spray when irradiated by a blackbody. Numerical results and experimental data both show a better ability of the spray to attenuate radiation when injected upward. The residence time of droplets is highly increased when they are injected upward. This results in an increased attenuation ability of the spray. A gain by a factor 3 or more is possible regarding the attenuation of radiation if water is injected upward. This observation has to be considered with care however because of a possible poor stability of the spray. The influence of an air flow affecting the spray dynamics has also been investigated numerically, tests being done with a 2 m/s air flow. The droplet motion is strongly altered and the radiation attenuation is affected. In the upward injection case the deformation of the spray may be so strong in its upper part that the attenuation tends to zero because droplets are carried away.
机译：已经在实验室规模上对喷雾进行了数值和实验研究，重点是向下和向上喷射情况之间的比较。借助专用数字代码进行了仿真，该数字代码使用欧拉-拉格朗日方法处理了两相流，并使用蒙特卡洛方法处理了辐射传递。实验装置包括一台FT1R光谱仪和一台红外热像仪，当被黑体照射时，两者同时表征了通过喷雾的光谱衰减。数值结果和实验数据均表明，当向上喷射时，喷雾具有更好的衰减辐射的能力。当液滴向上注入时，其停留时间会大大增加。这导致喷雾的衰减能力增强。如果向上注入水，则辐射衰减可能达到3倍或更大。但是，由于喷雾的稳定性可能很差，因此必须谨慎考虑该观察结果。还对气流对喷雾动力学的影响进行了数值研究，测试以2 m / s的气流进行。液滴的运动发生了强烈变化，辐射衰减受到影响。在向上喷射的情况下，喷雾的变形可能在其上部如此强烈，以至于由于液滴被带走，衰减趋于零。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第10期|p.1689-1697|共9页
  • 作者

    S. Lechene; Z. Acem; G. Parent; G. Jeandel; P. Boulet;

  • 作者单位

    LEMTA Nancy-Université. CNRS, Faculté des Sciences et Technologies, BP 70239, 54506 Vandceuvre lés Nancy Cedex, France;

    LEMTA Nancy-Université. CNRS, Faculté des Sciences et Technologies, BP 70239, 54506 Vandceuvre lés Nancy Cedex, France;

    LEMTA Nancy-Université. CNRS, Faculté des Sciences et Technologies, BP 70239, 54506 Vandceuvre lés Nancy Cedex, France;

    LEMTA Nancy-Université. CNRS, Faculté des Sciences et Technologies, BP 70239, 54506 Vandceuvre lés Nancy Cedex, France;

    LEMTA Nancy-Université. CNRS, Faculté des Sciences et Technologies, BP 70239, 54506 Vandceuvre lés Nancy Cedex, 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

    water spray; radiative transfer; droplet; radiation attenuation;

    机译：喷水;辐射传递;液滴;辐射衰减;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号