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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Measurement of instantaneous flow velocities in a concentric reducer using Particle Image Velocimetry: Study of scale deposition
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Measurement of instantaneous flow velocities in a concentric reducer using Particle Image Velocimetry: Study of scale deposition

机译：使用粒子图像测速仪测量同心异径管中的瞬时流速：结垢的研究

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摘要

Deposition of scale (dispersed solids) on the walls of pipework of process plants is a serious maintenance issue. A study conducted at an alumina refinery has revealed a phenomenon of a substantial increase in the rate of scale deposition on the walls of a concentric reducer when compared to that for adjacent straight pipes. To explain this phenomenon the measurement of instantaneous velocity fields in a liquid passing a concentric reducer has been undertaken using Particle Image Velocimetry (PIV). The variation of both the stream-wise and cross-stream components of the fluctuating velocity (u(x)' and u(r)' respectively) in the proximity of the wall in the scale model of a concentric reducer has been measured. It has been found that the cross-stream component of the fluctuating velocity, u(r)' varies significantly as flow passes through the concentric reducer. At a Reynolds number of 43,740 and at the distance from the wall of 0.05R (R is the radius of the pipework) the component u(r)' in the reducer becomes five times greater than that at the walls of the straight pipes connected to the reducer. Such a variation in the near-wall u(r)' may be accountable for the increase in gibbsite scale deposition rate observed on the surface of a concentric reducer.
机译：在加工厂管道壁上沉积水垢（分散的固体）是一个严重的维护问题。在氧化铝精炼厂进行的一项研究表明，与相邻的直管相比，同心异径管壁上的水垢沉积速率显着增加。为了解释这种现象，已经使用粒子图像测速技术（PIV）对通过同心异径管的液体中的瞬时速度场进行了测量。在同心异径管的比例模型中，已测量了壁附近的脉动速度（分别为u（x）'和u（r）'）的沿流和沿流的分量的变化。已经发现，脉动速度的横流分量u（r）′随着流过同心异径管而明显变化。在雷诺数为43,740且距壁的距离为0.05R（R为管道的半径）时，减速器中的分量u（r）'变为与连接到管道的直管壁的分量的五倍。减速器。近壁u（r）′的这种变化可以解释为在同心异径管的表面上观察到的三水铝石垢沉积速率的增加。

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