Heine C, Kupferschläger K, Stapf S, Blümich B
Institute of Technical Chemistry and Macromolecular Chemistry, Rheinisch-Westfälische Technische Hochschule, Aachen, D-52056, Germany.
J Magn Reson. 2002 Feb;154(2):311-6. doi: 10.1006/jmre.2001.2495.
First results on NMR velocimetry of falling liquid films are presented. A film of average thickness 1 mm and width 40 mm is sustained by a continuous flow of silicon oil over a vertical plate made from PMMA. The spatial distribution of velocities is measured using a double spin--echo imaging pulse sequence supplemented by a bipolar velocity encoding gradient. Spin density and velocity images as well as two-dimensional velocity maps of different situations, i.e., undisturbed and disturbed falling film flow, are discussed. Experimental and theoretical velocity data for undisturbed film flow are compared.
本文给出了关于下落液膜核磁共振测速的初步结果。平均厚度为1毫米、宽度为40毫米的液膜由硅油在由聚甲基丙烯酸甲酯制成的垂直平板上连续流动维持。使用双自旋 - 回波成像脉冲序列并辅以双极速度编码梯度来测量速度的空间分布。讨论了不同情况下（即未受干扰和受干扰的下落液膜流动）的自旋密度和速度图像以及二维速度图。比较了未受干扰液膜流动的实验和理论速度数据。
