NMR velocimetry of falling liquid films.
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.
Heine
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Institute of Technical Chemistry and Macromolecular Chemistry, Rheinisch-Westfälische Technische Hochschule, Aachen, D-52056, Germany.
Kupferschläger
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Stapf
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Blümich
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