• 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 - Flow Analysis of a Rising Crude Oil Micro-Droplet Affected by Attached Microbial Streamers
【24h】

APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Flow Analysis of a Rising Crude Oil Micro-Droplet Affected by Attached Microbial Streamers

机译：APS-流体动力学APS部门第70届年会-事件-受到附着微生物拖缆影响的上升的原油微滴流动分析

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

摘要

Microfluidic experiments show bacteria flowing past a pinned crude oil droplet produce microbial aggregates and streamers on the oil-water interface. High speed DIC microscopy at 1000 fps for 1 sec with a sampling interval of 10 min captures the evolving flow and bacterial motility as well as adhesion, aggregation and streamer events. With bacteria as tracers, velocity measurements are acquired with in-house PIV-assisted PTV software. Flow fields with spatial resolution 2.5 $mu$m are measured around an O(100) $mu$m drop in a 700$imes$700 $mu$m window. Full budgets of the 2D Navier-Stokes equation are faithfully resolved to determine pressure gradients by performing the balance over a control volume enclosing the droplet. Pressure gradients are integrated over the border of the control region to obtain pressure profiles at the leading and trailing edges. A momentum balance can be used to determine the drag induced by the drop and any attached streamers. Cases with and without streamers and their differing flow features are presented. Additionally streamers produce nonzero curl in the pressure gradient field providing a tool for identifying the position of otherwise invisible streamers. Ongoing experiments and future applications of the tools presented here will be discussed.
机译：微流体实验表明，流过固定原油滴的细菌会在油水界面上产生微生物聚集体和流光。高速DIC显微镜在1000 fps下进行1秒钟，采样间隔为10分钟，捕获了不断发展的流量和细菌运动性以及粘附，聚集和流光事件。使用细菌作为示踪剂，可使用内部PIV辅助的PTV软件获取速度测量值。空间分辨率为2.5μm的流场是在700imes $ 700μm窗口中的O（100）μm下降附近测量的。通过对围绕液滴的控制体积进行平衡，可以忠实地解析2D Navier-Stokes方程的全部预算，以确定压力梯度。在控制区域的边界上对压力梯度进行积分，以获得前缘和后缘的压力分布。动量平衡可用于确定由水滴和任何附着的拖缆引起的阻力。介绍了带有和不带有拖缆的情况及其不同的流动特性。另外，拖缆在压力梯度场中产生非零卷曲，从而提供了一种工具来识别原本不可见的拖缆的位置。将讨论此处介绍的工具的正在进行的实验和将来的应用。

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