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首页> 外文期刊>Journal of the Brazilian Society of Mechanical Sciences and Engineering >Determining the viscous behavior of non-Newtonian fluids in a flume using a laminar sheet flow model and Ultrasonic Velocity Profiling (UVP) system
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Determining the viscous behavior of non-Newtonian fluids in a flume using a laminar sheet flow model and Ultrasonic Velocity Profiling (UVP) system

机译：使用层流板流动模型和超声波速度分析（UVP）系统确定水槽中非牛顿流体的粘性行为

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摘要

The flow of non-Newtonian fluids in rectangular open channels has received renewed interest over the past number of years especially as large flumes are being used to transport tailings in countries like Chile. The effect of yield stress on the flow behavior is complex and not yet fully understood. The Ultrasonic Velocity Profiling (UVP) technique has been used to construct velocity profiles of non-Newtonian fluids flowing in a 10 m by 300 mm wide tilting flume. The contour maps were integrated to show that the velocity profiles were indeed correct. The thin film flow models available in the literature have been tested in terms of flow depth and Reynolds number. The measured profiles also show the influence of the side walls on the general flow features as the distance from the centre increases. The results reported herein span the laminar, transition and turbulent flow regions. As far as can be ascertained, it is the first time that this technique has been used to measure velocity profiles in opaque non-Newtonian fluids for open channel flow. It is shown here that, under appropriate conditions, the velocity profile and flow depth can be used to obtain the viscous properties of the fluids tested. Excellent correspondence between the rheological parameters inferred from the velocity profile measurements and that from the tube viscometry was obtained.
机译：在过去的几年中，非牛顿流体在矩形明渠中的流动重新引起了人们的兴趣，尤其是在智利等国家使用大水槽运输尾矿时。屈服应力对流动行为的影响是复杂的，尚未完全理解。超声波速度剖析（UVP）技术已用于构造在10 m x 300 mm宽的倾斜水槽中流动的非牛顿流体的速度分布。整合等高线图以显示速度轮廓确实正确。文献中可用的薄膜流动模型已经根据流动深度和雷诺数进行了测试。测得的轮廓还显示了随着距中心距离的增加，侧壁对总体流动特征的影响。本文报道的结果跨越层流，过渡和湍流区域。可以确定的是，这是首次使用此技术来测量不透明非牛顿流体中明渠流动的速度分布。在此表明，在适当的条件下，速度曲线和流动深度可用于获得所测试流体的粘性。从速度曲线测量结果推断出的流变参数与从管式粘度计得出的流变参数之间具有极好的对应关系。

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