...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Heat Transfer >Quantitative Experimental Investigation on the Flow Characteristics of Nanofluids in Turbulent Flow
【24h】

Quantitative Experimental Investigation on the Flow Characteristics of Nanofluids in Turbulent Flow

机译：纳米流体在湍流中流动特性的定量实验研究

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

In addition to the increase of thermal conductivity, heat transfer enhancement mechanism for nanofluids also includes the changes of the flow characteristics, therefore it is needed to take an in-depth research on nanofluids flow characteristics. In this paper, the flow characteristics of H_2O and SiO_2-H_2O nanofluids in a rectangular convex channel (channel composed of continuous staggered rectangular convex platform) at the Reynolds numbers 2300, 2500, 3000 and 4000 are studied by the quantitative PIV method (Fig. 1a). The rectangular convex channel (Fig. 1b) has periodic perturbation effect on the fluid flow, so that the flow direction is changed for several times, and vortexes are generated, which makes turbulence enhanced. In this way, flow is in the intense turbulent state under a low flow rate. Results show that the flow fields becomes more chaotic by the addition of nanoparticles (Fig. 2 and 3). Both the number and the size of vortices increase observably. The vorticity of nanofluids is also enhanced compared with H_2O, and with the increase of Reynolds number, the increased ratio in the vorticity magnitude is getting higher (Fig. 4).
机译：纳米流体的传热增强机理除了增加导热系数外，还包括流动特性的变化，因此有必要对纳米流体的流动特性进行深入研究。本文采用定量PIV方法研究了H_2O和SiO_2-H_2O纳米流体在雷诺数为2300、2500、3000和4000的矩形凸形通道（由连续交错的矩形凸形平台组成的通道）中的流动特性（图。 1a）。矩形凸形通道（图1b）对流体流动具有周期性的扰动作用，因此，流向会发生多次变化，并产生涡流，从而使湍流增强。以此方式，在低流速下流动处于强烈的湍流状态。结果表明，通过添加纳米颗粒，流场变得更加混乱（图2和3）。涡流的数量和大小都明显增加。与H_2O相比，纳米流体的涡度也增强了，并且随着雷诺数的增加，涡度的增加比例也越来越高（图4）。

著录项

  • 来源
    《Journal of Heat Transfer》 |2020年第3期|030907.1-030907.1|共1页
  • 作者

    Jizu Lv; Chengzhi Hu; Zhenxian Zhang; Minli Bai;

  • 作者单位

    Laboratory of Ocean Energy Utilization of Ministry of Education School of Energy and Power Engineering Dalian University of Technology Dalian China;

  • 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

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