Fluid-dynamic forces acting on particles in turbulent pipe flows

作用于湍流管流中颗粒的流体动力

• 批准号: 62550130
• 负责人: TSUJI Yutaka
• 金额: $ 1.28万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550130/
• 关键词: Multiphase Flow; Gas-Solid Flow; Fluid Drag; Unsteadiness; Collision Pulsating Flow; 軌跡; 衝突; 確率密度; 最小輸送速度; 反発; 剥離

Various assumptions for simplifying analyses have been adopted in simulations of multiphase flows without sufficient assurance for the assumptions. For instance, drag on a sphere in a uniform laminar flow is generally used in calculations of particle pathes in strongly turbulent flows. This work has been undertaken to confirm such assumptions, and the following two subjects have been dealt with.1. Drag on a sphere 2. Collision of particles with the pipe wallFor the first subject, the drag on a sphere and its wake in a periodically pulsating flow were investigated experimentally. Although the wake region becomes smaller and the turbulent intensity in the wake is weaker during the period of flow acceleration than deceleration, the flow acceleration increases the drag.The experimental work of the second subject has shown that the effects of fluid turbulence on particle motion is secondary compared with the effects of collision in the case of large particles.

在多相流的模拟中采用了各种简化分析的假设，但这些假设没有足够的保证。例如，均匀层流中球体上的阻力通常用于计算强湍流中的颗粒路径。进行这项工作是为了证实这些假设，并讨论了以下两个问题。在球体上拖动2.颗粒与管壁的碰撞第一个课题是对周期性脉动流中球体及其尾迹的阻力进行了实验研究。虽然在流动加速期间尾流区变小，尾流中的湍流强度比流动减速期间弱，但流动加速使阻力增加。第二个课题的实验工作表明，在大颗粒的情况下，与碰撞的影响相比，流体湍流对颗粒运动的影响是次要的。

项目成果

加藤直樹: 機械学会関西支部第62期定期総会講演会講演概要集. No. 874-2. 98-99 (1987)

加藤直树：日本机械工程师学会关西分会第 62 届年会摘要，第 98-99 号（1987 年）。

石田俊哉: 機械学会関西支部第63期定時総会講演会講演概要集. No.884ー2. 64 (1988)

Toshiya Ishida：日本机械工程师学会关西分会第 63 届年会摘要，第 884-2 号（1988 年）。

沈能耀: 日本機械学会論文集.

沉永耀：日本机械工程师学会会议录。

加藤直樹: 機械学会関西支部第62期定時総会講演会講演概要集. No.874ー2. 98-99 (1987)

加藤直树：日本机械工程师学会关西分会第 62 届年会摘要，第 874-2 号（1987 年）。