Impact of drops of polymer solutions on small targetsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 2 февраля 2018 г.
Аннотация:The collision of drops of polymer solutions with small targets was studied experimentally. The
tested liquids were aqueous solutions of polyethylene oxide ~MW54 000 000! at concentrations of
10, 100, 1000 wt ppm. The drop impact velocity was about 3.5 m/s, and the drop diameters were in
the range of 2.6–3.8 mm. The target was a stainless steel disk of 3.9 mm diameter. The collision was
monitored by means of high-speed photography technique. As in the case of pure water, a circular
liquid lamella was formed, and then it retracted with formation of outwards-directed secondary jets.
There was no significant difference between the values of the maximum diameter and the retraction
velocity of the lamella in the cases of water and polymeric liquids. On the contrary, the polymeric
additives drastically changed the character of the lamella retraction. The secondary jets were
transformed into thinning filaments submitted to elastic stresses with an attached droplet. Then,
depending on the polymer concentration, the filaments ruptured and the attached droplets escaped,
or the liquid filaments pulled the attached droplets back and the whole liquid returned to the target.
A splashing threshold has been derived for polymeric liquids based on the liquid relaxation time and
the impact conditions.