Abstract
Based on the hypothesis of fluidity loss, which arises as a result of deformative orientation developing in polymer liquids at large elastic strains, the problem of the withdrawal of polymer solutions from a reservoir with a free liquid surface as well as the open-channel siphon problem have been treated theoretically. The assumption is made that after fluidity loss occurs the polymer solution deforms like a highly elastic cross-linked rubber. A quantitative comparison between the theoretical results and some experiments is also given.
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