• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Fluid flow, heat transfer and entropy generation analyses of turbulent forced convection through isotropic porous media using RANS models
【24h】

Fluid flow, heat transfer and entropy generation analyses of turbulent forced convection through isotropic porous media using RANS models

机译：使用RANS模型分析通过各向同性多孔介质进行的湍流强迫对流的流体流动，传热和熵产生

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

Turbulent fluid flow, heat transfer and entropy generation through isotropic porous media were investigated utilizing two RANS models, i.e., RNG k-epsilon and SST k-omega. Circular, longitudinal elliptical and transverse elliptical cross-sectional configurations were analyzed with symmetrical boundary conditions for the upper and lower lines and periodic boundary conditions for the back and front lines. Evaluation of the temperature contours indicated two low-temperature regions behind the solid rods of the transverse elliptical cross-sectional configuration exist. For a given specific normalized pressure gradient, dimensionless turbulence kinetic energy, Nusselt number, and heat transfer efficiency, the RNG k-epsilon model resulted in more reliable results for the dimensionless turbulence kinetic energy at low Reynolds numbers when compared with the SST k-omega model. Using the thermal analysis of the three cross-sectional configurations investigated, the longitudinal elliptical resulted in higher heat transfer efficiencies when compared with the circular and transverse elliptical cross-sectional configurations. When the influence of the turbulence effects were included in the entropy generation rate, a second law of thermodynamics analysis indicated that the longitudinal elliptical cross-sectional configuration resulted in a lower entropy generation rate when compared with the circular and transverse elliptical cross-sectional configurations. Combining the results of the first and second law analyses for the three cross-sectional configurations, it is apparent that isotropic porous media consisting of the longitudinal elliptical cross-sectional configuration can simultaneously result in a high heat transfer efficiency and low entropy generation rate. (C) 2018 Elsevier Ltd. All rights reserved.
机译：利用两种RANS模型，即RNGk-ε和SSTk-ω，研究了通过各向同性多孔介质的湍流，传热和熵产生。圆形，纵向椭圆和横向椭圆的横截面配置通过上下边界的对称边界条件和前后边界的周期性边界条件进行了分析。对温度轮廓的评估表明，在横截面为椭圆形的实心棒后面存在两个低温区域。对于给定的特定归一化压力梯度，无量纲湍流动能，努塞尔数和传热效率，与SSTk-ω相比，RNGk-ε模型在低雷诺数下产生了无量纲湍流动能的更可靠结果模型。通过对所研究的三种横截面构造进行热分析，与圆形和横向椭圆形横截面构造相比，纵向椭圆形具有更高的传热效率。当将湍流效应的影响包括在熵产生速率中时，热力学分析的第二定律表明，与圆形和横向椭圆形横截面构造相比，纵向椭圆形横截面构造导致较低的熵产生速率。结合针对这三个横截面构造的第一定律和第二定律分析的结果，很明显，由纵向椭圆形横截面构造组成的各向同性多孔介质可以同时导致较高的传热效率和较低的熵产生率。 （C）2018 Elsevier Ltd.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