Shew Woodrow L, Gasteuil Yoann, Gibert Mathieu, Metz Pascal, Pinton Jean-François
Laboratoire de Physique de l'Ecole Normale Supérieure de Lyon, CNRS UMR5672, 46 allée d'Italie, F-69007 Lyon, France.
Rev Sci Instrum. 2007 Jun;78(6):065105. doi: 10.1063/1.2745717.
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 measures temperature and transmits the data via a wireless radio frequency link to a desktop computer. The device has 80 dB dynamic range, resolving millikelvin 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 analyze 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-Bénard convection. The device shows promise for opening new research in a broad variety of fluid systems.
我们开发了用于在各种流体流动中进行拉格朗日温度测量的新型仪器。一个小型中性浮力胶囊配备了板载电子设备，该设备可测量温度，并通过无线射频链路将数据传输到台式计算机。该设备具有80 dB的动态范围，能够在高达100 ms的采样时间内分辨出温度的毫开尔文变化。这些“智能粒子”的功能在水中的湍流热对流中得到了展示。我们测量粒子在对流运动中平流时的温度变化，并分析其统计数据。额外使用摄像头使我们能够跟踪粒子位置，并在此报告瑞利-贝纳德对流中拉格朗日热通量传输的首次直接测量结果。该设备有望为各种流体系统的新研究开辟道路。
