Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 3, pp. 288-294
On the effect of film slick compression
S.A. Ermakov
1 , A.V. Ermoshkin
1 , I.A. Kapustin
1 1 Institute of Applied Physics RAS, Nizhniy Novgorod, Russia
Accepted: 25.05.2017
DOI: 10.21046/2070-7401-2017-14-3-288-294
A new effect has been discovered in the field experiments at the Gorky Water Reservoir. The effect consists in stopping of film spreading over water surface followed by compression of the film and transition to a steady state. The evolution of a spot of a surfactant film with pre-measured characteristics was studied. The observations were carried out with navigational radar mounted on a lighthouse. A physical explanation of the effect is suggested based on consideration of surface stresses, induced by wind waves that act against surface tension forces, thus reducing film spreading. The induced stresses for highly elastic films increase with elasticity reduction and achieve a maximum at some elasticity value, depending on viscosity and wave frequency. Surfactant concentration as well as elasticity and film pressure decrease during film spreading. As a result, the induced stress can exceed the surface tension force which results in film compression and transition to an equilibrium state.
Keywords: films on the sea surface, slicks, wind waves, radar probing
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