NMR velocimetry of falling liquid films.
NMR velocimetry of falling liquid films.
复制标题
下降液膜的核磁共振测速。
DOI：
10.1006/jmre.2001.2495
复制
发表时间：
2002
影响因子：
2.2
通讯作者：
B. Blümich
中科院分区：
文献类型：
--
作者：
C. Heine;K. Kupferschläger;S. Stapf;B. Blümich
首先给出了液膜下落的核磁共振测速结果。平均厚度为1 mm、宽度为40 mm的薄膜由硅油连续流过由PMMA制成的垂直板支撑。使用双自旋-回波成像脉冲序列加上双极速度编码梯度来测量速度的空间分布。讨论了不同情况下的自旋密度和速度图像以及二维速度图，即无扰动和扰动的降膜流动。比较了无扰动气膜流动的实验和理论速度数据。
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.