• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Influence of Al2O3-H2O nanofluid on performance of twisted minichannels
【24h】

Influence of Al2O3-H2O nanofluid on performance of twisted minichannels

机译：Al2O3-H2O纳米流体对扭曲微通道性能的影响

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

Laminar flow and heat transfer characteristics of Al2O3-H2O nanofluid in the twisted minichannel (TMC) with different structural parameters are studied using a 3D numerical scheme. Effects of the cross section configuration (elliptic, half circular, square, rectangular, and triangular), twist pitch to channel length ratio (P/L = 0.25, 0.50, and 1.0), nanoparticle volume fraction (phi = 0 - 4%), and Reynolds number (Re = 300-1500) are investigated. The obtained results show that all the tested TMCs have better heat transfer performance than the smooth circular minichannel, the average enhancement factors provided by the TMCs range from 1.04 to 1.51. It is also found that lower values of the P/L ratio result in higher heat transfer coefficients and pressure drops. Likewise, the best operating regime for the TMCs is at lower Reynolds numbers. The square TMC with the lowest P/L ratio of 0.25 offers the highest value of the heat transfer rate to pumping power ratio at the minimum studied Reynolds number of 300. For all the cases, the nanofluid flow presents higher values of the heat transfer coefficient and pressure drop compared to the base fluid; the nanofluid has better thermal-hydraulic performances than the base fluid when its volume fraction is 1%. Finally, correlations are developed for the TMCs with different cross section geometries in the range of the studied Reynolds number, i.e. 300-1500. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
机译：利用3D数值方案研究了具有不同结构参数的扭曲微通道（TMC）中Al2O3-H2O纳米流体的层流和传热特性。横截面配置（椭圆形，半圆形，正方形，矩形和三角形），扭曲间距与通道长度之比（P / L = 0.25、0.50和1.0），纳米颗粒体积分数（phi = 0-4％）的影响，并研究了雷诺数（Re = 300-1500）。获得的结果表明，所有测试的TMC都比光滑的圆形微型通道具有更好的传热性能，TMC提供的平均增强因子为1.04至1.51。还发现较低的P / L比值导致较高的传热系数和压降。同样，TMC的最佳运行机制是雷诺数较低。最低P / L比为0.25的方形TMC在最小研究雷诺数为300的情况下提供了最高的传热速率与泵浦功率之比的值。在所有情况下，纳米流体流都表现出更高的传热系数与基础流体相比的压降;当纳米流体的体积分数为1％时，它比基础流体具有更好的热工水力性能。最后，在研究的雷诺数范围内（即300-1500），为具有不同横截面几何形状的TMC开发了相关性。 （C）2016日本粉末技术学会。由Elsevier B.V.和日本粉末技术学会出版。版权所有。

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