Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scission of flexible polymers in contraction flow: predicting the
  effects of multiple passages   When injected through a contraction, high molecular weight polymer solutions
exhibit a sharp increase of apparent viscosity which originates from stretching
polymer chains above a critical extension rate. This chain stretching can also
induce polymer scission, which then decreases the extensional viscosity. In
practice, the two phenomena are difficult to separate. Moreover, these
phenomena are often observed in situation where flow instabilities appear. In
order to disentangle the two effects we have measured the pressure-flux
relation for polymer solutions passing through a hyperbolic contraction. The
ratio of the pressure drop to that of the (Newtonian) solvent has a maximum due
to the competition between polymer extension and scission. We find a
geometry-dependent relation between the flow rates at which the maximum occurs
for successive passages in a given contraction, which appears to be independent
of molecular weight, concentration, solvent quality and viscosity, and can be
used to predict the scission under successive passes.

11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an