Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Viscous Flow Over a Chemically Patterned Surface   The classical fluid dynamics boundary condition of no-slip suggests that
variation in the wettability of a solid should not affect the flow of an
adjacent liquid. However experiments and molecular dynamics simulations
indicate that this is not the case. In this paper we show how flow over a solid
substrate with variations of wettability can be described in a continuum
framework using the interface formation theory developed earlier. Results
demonstrate that a shear flow over a perfectly flat solid surface is disturbed
by a change in its wettability, i.e. by a change in the chemistry of the solid
substrate. The magnitude of the effect is shown to be proportional to
cos(t1)-cos(t2) where t1 and t2 are the equilibrium contact angles that a
liquid-gas free surface would form with the two chemically different parts of
the solid surface.

4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg