• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Numerical simulation of natural convection between a decentered triangular heating cylinder and a square outer cylinder filled with a pure fluid or a nanofluid using the lattice Boltzmann method
【24h】

Numerical simulation of natural convection between a decentered triangular heating cylinder and a square outer cylinder filled with a pure fluid or a nanofluid using the lattice Boltzmann method

机译：偏心三角形加热缸与充满纯流体或纳米流体的方形外缸之间自然对流的数值模拟，采用格子玻尔兹曼方法

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

Natural convection around a decentered triangular cylinder placed in a square cylinder is studied numerically using the lattice-Boltzmann method. The study is conducted for pure water and water-silver nanofluid. The inner heating triangular cylinder is maintained at a constant and uniform temperature while the vertical/(horizontal) sides of the external cylinder are cooled at constant temperature/(considered adiabatic). The numerical analysis is carried out for three decentered positions of the triangular block toward the left side of the outer square cylinder; these are Left-Bottom (LB), Left-Middle (LM) and Left-Top (LT). The other parameters governing the problem are the Rayleigh number (10(3) <= Ra <= 10(7)), the Prandtl number of the pure water (Pr = 7) and the volume fraction of nanoparticles (0 <= phi <= 0.1). The effective thermal conductivity and viscosity of nanofluids are calculated using Maxwell-Garnetts (MG) and Brinkman models, respectively. The results obtained show that fluid flow and heat transfer characteristics are highly affected by the heating cylinder position. The increase of nanoparticles volume fraction has a positive impact on the average Nusselt number for all considered positions of the heating block. Results of the block's positions on the vertical centerline of the outer cylinder are also presented and discussed for comparison purposes. In dominating natural convection regime, it is found out that the bottom/(top) position of the block becomes the most/(least) favorable to heat transfer. (C) 2015 Elsevier B.V. All rights reserved.
机译：使用格-玻尔兹曼方法数值研究了放置在方形圆柱体中的偏心三角形圆柱体周围的自然对流。该研究是针对纯水和水银纳米流体进行的。内加热三角筒保持在恒定且均匀的温度，而外筒的垂直/（水平）侧以恒定温度/（考虑到绝热）冷却。对三角形块朝外方圆柱体左侧的三个偏心位置进行了数值分析;它们是左下（LB），左中（LM）和左上（LT）。控制该问题的其他参数是瑞利数（10（3）<= Ra <= 10（7）），纯水的普朗特数（Pr = 7）和纳米粒子的体积分数（0 <= phi < = 0.1）。分别使用Maxwell-Garnetts（MG）和Brinkman模型计算纳米流体的有效导热率和粘度。获得的结果表明，流体的流动和传热特性受加热筒位置的影响很大。对于加热块的所有考虑位置，纳米颗粒体积分数的增加对平均努塞尔数具有积极影响。出于比较目的，还介绍并讨论了块在外圆柱的垂直中心线上的位置结果。在主导自然对流方式中，发现块的底部/（顶部）位置成为最有利于/最不利于传热的位置。 （C）2015 Elsevier B.V.保留所有权利。

著录项

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