...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - The role of double diffusion on the entrainment in turbulent plumes
【24h】

APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - The role of double diffusion on the entrainment in turbulent plumes

机译：APS-流体动力学APS部门第70届年会-事件-双重扩散对湍流烟气中夹带的作用

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Turbulent plumes are common features in environmental fluids, which occur whenever buoyant fluid is persistently released from a localised source. Such flows play a fundamental role in a large number of geophysical and industrial applications. The evolution and ultimate fate of the plume fluid is largely determined by the process of turbulent entrainment. It is not uncommon for the buoyancy to arise from two components with different molecular diffusivities, forming a double-diffusive configuration, e.g. a plume of cold and fresh meltwater rising along the sidewall of a melting iceberg in a relatively warm and salty ambient ocean. We study the effect of molecular diffusion on turbulent entrainment through experimental investigation of doubly-diffusive plumes. The experiments used the ‘filling-box’ technique developed by Baines (1983), with water as the working fluid. To ensure mass and energy conservation, instead of the conventional temperature-salinity combination, double-diffusive configurations were obtained by releasing sucrose solution into a salty ambient. Our findings suggest that the entrainment rate is decreased when the source of buoyancy is double-diffusive. Thus, it seems that turbulent entrainment can depend on mixing processes and diffusion at the molecular level.
机译：湍流羽流是环境流体中的常见特征，每当从本地源持续释放浮力流体时，就会发生湍流羽。这样的流动在大量地球物理和工业应用中起着根本性的作用。羽状流体的演变和最终命运在很大程度上取决于湍流夹带的过程。由具有不同分子扩散性的两种组分产生的浮力并形成双扩散构型，例如双峰，是很常见的。在相对温暖和咸的环境海洋中，一股冷的和新鲜的融水沿着融化的冰山的侧壁上升。我们通过对双扩散羽的实验研究来研究分子扩散对湍流夹带的影响。实验使用的是贝恩斯（Baines，1983年）开发的“灌装箱”技术，以水为工作液。为了确保质量和能量节省，通过将蔗糖溶液释放到咸的环境中来获得双扩散配置，而不是常规的温度-盐度组合。我们的发现表明，当浮力源为双扩散时，夹带率降低。因此，似乎湍流夹带可能取决于分子水平上的混合过程和扩散。

著录项

相似文献

  • 外文文献
  • 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