NMR Velocimetry of Falling Liquid Films

✍ Scribed by C. Heine; K. Kupferschläger; S. Stapf; B. Blümich

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 155 KB
• Volume: 154
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.2001.2495

✦ Synopsis

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.