Rayleigh-Bénard对流中拉格朗日测量的仪器示踪剂
An instrumented tracer for Lagrangian measurements in Rayleigh-Bénard convection
摘要：
我们已经开发了新的仪器，使拉格朗日测量温度在不同的流体流动。一个小型的中性浮力胶囊配备了机载电子设备，可以测量温度并通过无线射频链接将数据传输到台式计算机。该器件具有80 dB的动态范围，可在高达100 ms的采样时间内分辨毫开尔文温度变化。这些“智能粒子”的能力在水中的湍流热对流中得到了证明。我们测量温度变化的粒子是平流的对流运动，并分析其统计。额外使用的相机使我们能够跟踪粒子的位置，并在这里报告的第一个直接测量的拉格朗日热通量传递瑞利-B {é}nard对流。该设备有望在各种流体系统中开展新的研究。
英文摘要：
We have developed novel instrumentation for making Lagrangian measurements of temperature in diverse fluid flows. A small neutrally buoyant capsule is equipped with on-board electronics which measure temperature and transmit the data via a wireless radio frequency link to a desktop computer. The device has 80 dB dynamic range, resolving milli-Kelvin changes in temperature with up to 100 ms sampling time. The capabilities of these "smart particles" are demonstrated in turbulent thermal convection in water. We measure temperature variations as the particle is advected by the convective motion, and analyse its statistics. Additional use of cameras allow us to track the particle position and to report here the first direct measurement of Lagrangian heat flux transfer in Rayleigh-B{é}nard convection. The device shows promise for opening new research in a broad variety of fluid systems.
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