The main objectives of this work is to produce detailed velocity profile measurements over a range of operating conditions of two phase gas/liquid flow with low liquid fractions in horizontal and inclined pipes. The experiments are performed in a 15 m long stainless steel pipe section with internal diameter 56 mm at room temperature and atmospheric outlet pressure. Exxsol D60 oil (viscosity 1.30 mPa s, density 793 kg/m3), water (viscosity 0.89 mPa s, density 999 kg/m3) and air (viscosity 0.018 mPa s, density 1.22 kg/m3) are used as test fluids. The pipe inclination is changed in the range from 5° upward to 5° downward. The measurements are made at mixture velocity, 5 m/s for different inlet liquid fractions. The cross-sectional distribution of phase fractions is measured using a traversable single-beam gamma densitometer. The particle image velocimetry (PIV) is utilized in order to obtain non-invasive instantaneous velocity measurements of the flow field. Based on the instantaneous local velocities, mean velocities, root mean squared velocities and Reynolds stresses are calculated. The measured mean velocity and turbulence profiles show a strong dependency with pipe inclination. The present measurements show that PIV can be successfully used as a practical measurement technique for multiphase flow applications with potential to become even more powerful in the near future as digital camera technology progresses.
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机译：这项工作的主要目的是在水平管和倾斜管中具有低液体分数的两相气/液流的运行条件范围内，进行详细的速度分布测量。实验是在15 m长的不锈钢管段中进行的，该管段在室温和大气压出口压力下的内径为56 mm。将Exxsol D60油（粘度1.30 mPa s，密度793 kg / m3），水（粘度0.89 mPa s，密度999 kg / m3）和空气（粘度0.018 mPa s，密度1.22 kg / m3）用作测试流体。管道的倾斜度在从5°向上到5°向下的范围内变化。对于不同的入口液体馏分，以5 m / s的混合速度进行测量。使用可穿越的单光束伽马密度计测量相分数的横截面分布。为了获得流场的非侵入式瞬时速度测量结果，使用了粒子图像测速仪（PIV）。基于瞬时局部速度，计算平均速度，均方根速度和雷诺应力。测得的平均速度和湍流曲线显示出与管道倾角的强烈相关性。当前的测量结果表明，PIV可以成功地用作多相流量应用的实用测量技术，并且随着数码相机技术的发展，在不久的将来可能会变得更加强大。
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