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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Study on flow behaviour in the short-throat-jet type flotation machine
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Study on flow behaviour in the short-throat-jet type flotation machine

机译：短喉型浮选机中的流动性能研究

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摘要

A two-dimensional model of the short-throat-jet flotation machine was developed for studying the flow behaviour and some difficult to measure parameters in the device using computational fluid dynamics (CFD). A laboratorial model was established for verifying the dependability of CFD, while a good agreement between measurement results and simulation was presented. With the inlet pressure set as 0.015 MPa, the minimum pressure close to the wall of the inhale section was obtained as 1200 Pa at Y= 164.2 mm, which was the optimal position for inhaling air. Moreover, the maximum pressure at the cell bottom was about 44,600 Pa at X = 15 mm from the centre of the jet, which was useful in selecting a suitable material to build the cell bottom. Analysis of wall shear stress showed that the wall shear stress on the right side of the jet was larger than that on the left side. Closer to the jet nozzle, the shear stress was larger. The wall shear stress on the right side of the short throat was likewise found to be larger than that on the left side, maximum difference being 140 Pa at Y= 115.5 mm. Analysis of the velocity field showed that the velocity decreased by 50% from the inlet to the outlet of the throat, and seven obvious vortexes were found to exist in the cell, where two of them in the inhale section were advantageous for inhaling air.
机译：开发了一种二维模型，用于使用计算流体动力学（CFD）来研究流动行为，一些难以测量装置中的参数难以测量。建立了实验室模型，用于验证CFD的可靠性，同时提出了测量结果与仿真之间的良好一致性。随着入口压力设定为0.015 MPa，获得靠近吸气部分壁的最小压力在Y = 164.2mm处获得1200Pa，这是吸入空气的最佳位置。此外，电池底部的最大压力在射线中心的X = 15mm处为约44,600Pa，这对于选择合适的材料以构建细胞底部。壁剪切应力分析表明，射流右侧的壁剪切应力大于左侧的侧面。靠近喷嘴，剪切应力较大。短喉部右侧的墙剪应力同样被发现大于左侧的大，最大差是在Y = 115.5mm处的140Pa。速度场的分析表明，速度从喉部出口的入口降低了50％，并且发现七个明显的涡旋中存在于细胞中，其中吸气部分中的两个是吸入空气的有利。

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