首页> 外文期刊>International Journal of Heat and Mass Transfer >Unconfined laminar nanofluid flow and heat transfer around a square cylinder
【24h】

Unconfined laminar nanofluid flow and heat transfer around a square cylinder

机译:方形圆柱体的无限制层流纳米流体流动和传热

获取原文
获取原文并翻译 | 示例
           

摘要

The momentum and forced convection heat transfer for a laminar and steady free stream flow of nano-fluids past an isolated square cylinder have been studied numerically. Different nanofluids consisting of A1_2O_3 and CuO with base fluids of water and a 60:40 (by mass) ethylene glycol and water mixture were selected to evaluate their superiority over conventional fluids. Recent correlations for the thermal conductivity and viscosity of nanofluids, which are functions of particle volumetric concentration as well as temperature, have been employed in this paper. The simulations have been conducted for Pe = 25, 50,100 and 200, with nanoparticle diameters of 30 and 100 nm and particle volumetric concentrations ranging from 0% to 4%. The results of heat transfer characteristics of nanofluid flow over a square cylinder showed marked improvement comparing with the base fluids. This improvement is more evident in flows with higher Peclet numbers and higher particle volume concentration, while the particle diameter imposes an adverse effect on the heat transfer characteristics. In addition, it was shown that for any given particle diameter there is an optimum value of particle concentration that results in the highest heat transfer coefficient.
机译:数值研究了流过纳米颗粒的层流和稳定的自由流通过隔离方筒的动量和强制对流换热。选择了由Al2_2O_3和CuO以及水,60:40(按质量计)的乙二醇和水混合物作为基础流体的不同纳米流体,以评估它们相对于常规流体的优越性。本文采用了纳米流体的导热系数和粘度的最新相关性,它们是颗粒体积浓度和温度的函数。已经针对Pe = 25、50,100和200进行了模拟,纳米粒子直径为30和100 nm,粒子体积浓度范围为0%至4%。与基础流体相比,纳米流体在方形圆柱体上流动的传热特性结果显示出显着改善。在具有更高的Peclet数和更高的颗粒体积浓度的流动中,这种改进更加明显,而粒径对传热特性产生不利影响。另外,已经表明,对于任何给定的粒径,存在最佳的颗粒浓度值,其导致最高的热传递系数。

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