• 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 >Impact of micro-fins on a heated cylinder submerged in a nanofluid saturated medium
【24h】

Impact of micro-fins on a heated cylinder submerged in a nanofluid saturated medium

机译：微翅片对纳米流体饱和介质中加热圆筒的影响

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

Flow and thermal features of nanofluid pool boiling on a circular heat sink with mirco-fins attached were numerically investigated. The initial geometry consisted of a horizontal cylinder with an outside diameter of 20 mm submerged in a saturated water/nanofluid for validation cases. Physical micro-fins with various configurations were added to the outside surface of the cylinder for the purpose of this study. Due to the presence of nanoparticles, three phases were considered in modelling as liquid, vapour and particles. Unsteady Eulerian- Eulerian from multiphase two-phase flow approach was combined with wall boiling model to identify the heat and mass transfer at the hot surface, as well as interaction forces between the liquid and vapour phases. For the case of nanofluid, thermo-physical properties were modified based on particles concentration. To track the fate of nanoparticles, discrete phase modelling was employed from the Lagrangian frame. To solve the boiling heat transfer at the hot surface and fins, nucleate site density and bubbles diameter were modified and implemented to account for the presence of nanoparticles and corrected roughness. All the equations were discretised and solved by CFD commercial software, ANSYS-Fluent vl9.5. The results showed that the impacts of fin aspect ratio on heat transfer are higher compared to the number of fins. However, the role of these geometrical parameters decreased as the nanofluid concentration increased. In addition, it was found that the best enhancement in heat transfer was obtained for nanofluid volume fraction around 1% vol.
机译：数值研究了纳米流体池的流动和热特征在圆形散热器上挖出圆形散热器，附着的Mirco-Fins进行了数量研究。初始几何形状由水平圆筒组成，外径为20mm，浸没在饱和水/纳米流体中用于验证情况。为了本研究的目的，将具有各种配置的物理微鳍片加入到气缸的外表面上。由于存在纳米颗粒，在液体，蒸汽和颗粒的建模中考虑了三相。来自多相双相流动方法的不稳定欧拉欧洲与壁沸腾模型相结合，以识别热表面的热量和质量传递，以及液体和蒸气相之间的相互作用力。对于纳米流体的情况，基于颗粒浓度改性热物理性质。为了跟踪纳米颗粒的命运，采用拉格朗日框架采用离散相位建模。为了解决热表面和翅片处的沸腾热传递，修饰核心位点和泡沫直径，并实施纳米颗粒和校正粗糙度的存在。所有方程式都是由CFD商业软件，ANSYS-FLUENT VL9.5离散化和解决。结果表明，与翅片的数量相比，翅片纵横比对热传递的影响更高。然而，随着纳米流体浓度的增加，这些几何参数的作用降低。此外，发现在纳米流体体积分数约为1％Vol的纳米流体体积分数获得最佳增强。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第10期|121551.1-121551.18|共18页
  • 作者

    Mostafa Mahdavi; Mohsen Sharifpur; Hikmet S. Aybar; Ali J. Chamkha; Josua P. Meyer;

  • 作者单位

    Department of Mechanical and Aeronautical Engineering University of Pretoria Pretoria 0002 South Africa;

    Department of Mechanical and Aeronautical Engineering University of Pretoria Pretoria 0002 South Africa Department of Medical Research China Medical University Hospital China Medical University Taichung Taiwan;

    Laser Applications Research Group Ton Duc Thang University Ho Chi Minh City Vietnam Faculty of Electrical and Electronics Engineering Ton Duc Thang University Ho Chi Minh City Vietnam;

    Faculty of Engineering Kuwait College of Science and Technology Doha District Kuwait Center of Excellence in Desalination Technology King Abdulaziz University P.O. Box 80200 Jeddah 21589 Saudi Arabia;

    Department of Mechanical and Aeronautical Engineering University of Pretoria Pretoria 0002 South Africa;

  • 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

    Pool boiling; Nanofluid; Horizontal finned cylinder; CFD analysis; Nucleate site density; Bubble diameter;

    机译：池沸腾;纳米流体;横翅圆柱;CFD分析;核心位点;泡泡直径;

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