• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Wind Engineering and Industrial Aerodynamics: The Journal of the International Association for Wind Engineering >CFD simulation of heat transfer at surfaces of bluff bodies in turbulent boundary layers: Evaluation of a forced-convective temperature wall function for mixed convection
【24h】

CFD simulation of heat transfer at surfaces of bluff bodies in turbulent boundary layers: Evaluation of a forced-convective temperature wall function for mixed convection

机译：湍流边界层中钝体表面传热的CFD模拟：混合对流强迫对流温度壁函数的评估

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

Accurate predictions of convective heat transfer are essential in building-engineering and environmental studies on urban heat islands, building energy performance, (natural) building and inter-building ventilation and building-envelope durability and conservation. In computational fluid dynamics (CFD) studies of these applications, wall functions are mostly used to model the boundary-layer region. Recently, an adjusted wall function for temperature (CWF) has been proposed (Defraeye et al., 2011a). This CWF was intended for forced-convective heat transfer at surfaces of bluff bodies, such as buildings in the atmospheric boundary layer (ABL). This CWF provides increased (wall-function) accuracy for convective heat transfer predictions and can be easily implemented in existing CFD codes. As ABL flow around buildings is often in the mixed-convective regime, the CWF performance is evaluated for situations with mixed convection in this paper. The CWF accuracy for mixed convection (~16% for the convective heat transfer coefficient, CHTC) is also much better than standard wall functions (~47% for the CHTC), but is Richardson-number dependent. The CWF approach can therefore significantly improve the accuracy of forced- or mixed-convective heat transfer in large-scale building-engineering or environmental studies, which are bound to rely on wall functions, but where accurate convective heat transfer predictions are required.
机译：对流传热的准确预测对于城市热岛的建筑工程和环境研究，建筑能源性能，（自然）建筑和建筑物间通风以及建筑围护结构的耐久性和节约至关重要。在这些应用的计算流体动力学（CFD）研究中，壁函数主要用于建模边界层区域。最近，有人提出了一种调整后的温度壁函数（CWF）（Defraeye et al。，2011a）。该CWF旨在在阻流体的表面（例如大气边界层（ABL）中的建筑物）进行强制对流传热。该CWF为对流传热预测提供了提高的（墙函数）精度，并且可以在现有CFD代码中轻松实现。由于建筑物周围的ABL流动通常处于混合对流状态，因此本文对混合对流情况下的CWF性能进行了评估。混合对流的CWF精度（对流传热系数约为16％，CHTC）也比标准墙函数（CHTC约为47％）要好得多，但取决于理查森数。因此，在大规模的建筑工程或环境研究中，CWF方法可以显着提高强制对流或混合对流换热的准确性，这些研究势必依赖墙的功能，但在需要精确对流换热预测的地方。

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