首页> 外文期刊>International communications in heat and mass transfer >Numerical analysis of unsteady natural convection from two heated cylinders inside a rhombus enclosure filled with Cu-water nanofluid
【24h】

Numerical analysis of unsteady natural convection from two heated cylinders inside a rhombus enclosure filled with Cu-water nanofluid

机译:装有铜水纳米流体的菱形外壳内两个加热圆柱体非定常自然对流的数值分析

获取原文
获取原文并翻译 | 示例
           

摘要

In this paper, natural convection due to two heated cylinders inside a rhombus enclosure with lower temperature with respect to the cylinders is investigated. Here, Cu-water is the working nanofluid. The numerical algorithm is based on an iterative direct immersed boundary method (IBM). The focus of this article is on stability, instability, symmetry as well as asymmetry of nanofluid flow pattern in three different Rayleigh (Ra) numbers, i.e. 104, 105 and 106. The effects of important parameters such as cylinder diameters, nanoparticle volume fraction and distance between two cylinders are analyzed. The results of this study disclose that at both Ra = 104 and 105, nanofluid flow is symmetric and stable, while at Ra = 106 four different flow regimes including steady-symmetric, steady-asymmetric, unsteady-asymmetric with periodic oscillations and unsteady-asymmetric with irregular oscillations are observed. In addition to geometrical parameters, nanoparticle volume fraction has a considerable impact on the flow regime. Furthermore, the possibility of unsteady-asymmetric flow increases considerably by increasing the distance between two cylinders.
机译:在本文中,研究了由于菱形外壳内的两个加热圆柱体相对于圆柱体温度较低而导致的自然对流。在这里,铜水是有效的纳米流体。数值算法基于迭代直接浸入边界方法(IBM)。本文的重点是在三种不同的瑞利(Ra)数(即104、105和106)下纳米流体流型的稳定性,不稳定性,对称性和不对称性。重要参数(例如圆柱体直径,纳米颗粒体积分数和分析两个气缸之间的距离。这项研究的结果表明,在Ra = 104和105时,纳米流体流是对称且稳定的,而在Ra = 106时,四种不同的流态包括稳态对称,稳态非对称,不稳定非对称以及周期性振荡和不稳定非对称。观察到不规则振荡。除几何参数外,纳米颗粒的体积分数对流动状态有相当大的影响。此外,通过增加两个气缸之间的距离,大大增加了非稳态流动的可能性。

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