Interactions between liquid jets and soap film

Sammanfattning: The interaction between thin jets of water and soap films have been studied. The experiments conducted for this thesis are the first done on jet - soap film interaction with different liquids in the two components. The results are very different from earlier studies where the same liquid was used for both components. Two behaviors were found for the interaction, depending on the incident angle between the incoming jet and soap film and the We number. For low incident angles the jet is bent by the soap film, making it possible to define an index of refraction for the soap film. The bending of the jet done by the soap film increases rapidly when approaching a We number of zero. For We numbers higher than five the jet passes through the film without changing direction. For high incident angles and low We number (≤ 1) the jet rebounds on the film, in analogy with total reflection in optics. The lifetime of the film is measured for different jet speed leading to the conclusion that there is mass exchange between the jet and film. This makes experiments impossible to perform at We ≥ 17, corresponding to a speed of 1.2 m/s. At this speed the soap film breaks before measurements can be done.