Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Desorption of hydrocarbon chains by association with ionic and nonionic
  surfactants under flow as a mechanism for enhanced oil recovery   The need to extract oil from wells where it is embedded on the surfaces of
rocks has led to the development of new and improved enhanced oil recovery
techniques. One of those is the injection of surfactants with water vapor,
which promotes desorption of oil that can then be extracted using pumps, as the
surfactants encapsulate the oil in foams. However, the mechanisms that lead to
the optimal desorption of oil and the best type of surfactants to carry out
desorption are not well known yet, which warrants the need to carry out basic
research on this topic. In this work, we report non equilibrium dissipative
particle dynamics simulations of model surfactants and oil molecules adsorbed
on surfaces, with the purpose of studying the efficiency of the surfactants to
desorb hydrocarbon chains, that are found adsorbed over flat surfaces. The
model surfactants studied correspond to nonionic and cationic surfactants, and
the hydrocarbon desorption is studied as a function of surfactant concentration
under increasing Poiseuille flow. We obtain various hydrocarbon desorption
isotherms for every model of surfactant proposed, under flow. Nonionic
surfactants are found to be the most effective to desorb oil and the mechanisms
that lead to this phenomenon are presented and discussed.

11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys