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Simultaneous measurements of velocity fields in thermal turbulence by USV and PIV

机译：USV和PIV同时测量热湍流中的速度场

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摘要

To test the validity of the ultrasonic velocimetry (USV) in thermal turbulence, we performed an experiment in water thermal turbulence. In this experiment, the velocity field was simultaneously measured by USV and particle image velocimetry (PIV), and then the measured velocity profiles, ω{sub}(USV)(t,z) and ω{sub}(PIV)(t,z), were compared. Due to equipment limitations, the measured velocity range was narrow (|ω| ≤ 8 mm/s) compared to the measurable range of USV (±91.3 mm/s), which made the test a severe one. Nevertheless, it was found that the correlation coefficient C{sub}(corr) between ω{sub}(USV)(t,z) and ω{sub}(PIV)(t,z) exceeds 0.9 and that C{sub}(corr) increases as ω increases. The results of this test show that USV method outputs data agreeing with PIV data except when the fluid velocity is so small that the digitization unit of USV (Δu = 0.72 mm/s in this test) is elicited explicitly. This encourages us to believe that in thermal turbulence the USV is as reliable a technique as the PIV method.
机译：为了测试超声测速法（USV）在热湍流中的有效性，我们进行了水热湍流实验。在此实验中，同时通过USV和粒子图像测速（PIV）测量了速度场，然后测量了速度分布ω{sub}（USV）（t，z）和ω{sub}（PIV）（t， z），进行比较。由于设备的限制，与USV的可测范围（±91.3 mm / s）相比，测得的速度范围较窄（|ω|≤8 mm / s），这使该测试成为一项严峻的考验。然而，发现ω{sub}（USV）（t，z）和ω{sub}（PIV）（t，z）之间的相关系数C {sub}（corr）超过0.9，并且C {sub} （corr）随着ω的增加而增加。该测试的结果表明，USV方法输出的数据与PIV数据一致，除非流体速度太小以至于可以明确得出USV的数字化单位（在此测试中，Δu= 0.72 mm / s）。这鼓励我们相信，在热湍流中，USV与PIV方法一样可靠。

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