Abstract The present experimental study has been carried out to evaluate the performance and flow characteristics of the Wafer cone flowmeter using Particle Image Velocimetry (PIV). Two equivalent diameters (β) of 0.62 and 0.72 with combination of two vertex angles (ϕ) namely 30°and 45°are used for the evaluation of the performance of the flowmeter in the range of Reynolds number of 3 × 103 to 8.19 × 104. The investigation shows that the coefficient of discharge seems to be independent of β-value with the increase in vertex angle. Further, the appropriate location of the downstream pressure tap is also estimated for the cone configuration of β = 0.62 and ϕ = 30°. It is observed that the downstream pressure tap location of 0.8D distance gives a higher value of discharge coefficient compared to 0.0D distance with the error being also lower marginally. PIV data has been analysed for the cone configuration of β = 0.62 and ϕ = 30°at four Reynolds numbers of 3028, 6057, 52755 and 74488 in terms of axial velocity and turbulent intensity. The measurements reveal an interesting phenomenon in terms of the rapid decay of turbulent kinetic energy on the downstream of the cone. This may be due to the interference of the cone wake with the support wake resulting in fast decay. This unique phenomenon leads to the reduction in the requirement of the downstream straight length for the Wafer cone flow meter, unlike other obstruction type flowmeters.

中文翻译：

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使用 PIV 的后支撑 V 锥流量计（晶圆锥）的流动特性

摘要 本实验研究已进行，以使用粒子图像测速法 (PIV) 评估对夹式锥形流量计的性能和流动特性。0.62和0.72的两个等效直径（β）与两个顶角（φ）即30°和45°的组合用于评估流量计在雷诺数3×103至8.19×104范围内的性能调查表明，随着顶角的增加，流量系数似乎与β值无关。此外，对于 β = 0.62 和 ϕ = 30° 的锥体配置，还估计了下游测压口的适当位置。观察到，与 0.8D 距离的下游测压孔位置相比，流量系数值更高。0D 距离，误差也略低。在轴向速度和湍流强度方面，在 3028、6057、52755 和 74488 的四个雷诺数下，针对 β = 0.62 和 ϕ = 30°的锥体配置分析了 PIV 数据。测量结果揭示了一个有趣的现象，即锥体下游湍流动能的快速衰减。这可能是由于锥形尾流与支撑尾流的干扰导致快速衰减。与其他阻塞式流量计不同，这种独特的现象导致对晶圆锥形流量计下游直线长度的要求减少。测量结果揭示了一个有趣的现象，即锥体下游湍流动能的快速衰减。这可能是由于锥形尾流与支撑尾流的干扰导致快速衰减。与其他阻塞式流量计不同，这种独特的现象导致对晶圆锥形流量计下游直线长度的要求减少。测量结果揭示了一个有趣的现象，即锥体下游湍流动能的快速衰减。这可能是由于锥形尾流与支撑尾流的干扰导致快速衰减。与其他阻塞式流量计不同，这种独特的现象导致对晶圆锥形流量计下游直线长度的要求减少。