Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 55, Issue 33, Pages 9077-9086Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.6b02400
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Funding
- Program for New Century Excellent Talents in University [NCET-13-0983]
- Foundation of Youth Science and Technology Innovation Team of Sichuan Province [2015TD0007]
- National Natural Science Foundation of China [21376193]
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In the present work, the effects of shear fields on the aggregation of asphaltene molecules in heptane were investigated by means of dissipative particle dynamics simulations. The geometries of asphaltene aggregates without shear fields were studied, and the simulation results provide an interpretation of the experimental results on the microscopic level. The effects of shear fields on asphaltene aggregates were also investigated by accessing the radial distribution functions, spatial orientation correlation functions, and the radii of gyrations. We show that the shear fields can destroy the conformational order of the aggregates by damaging the organized structure and isolating the asphaltenes. As the radius of gyration results show, the asphaltene molecules are elongated to be alike-polymers by shear fields. Moreover, the reason why the viscosity decreases under shear fields is that the shear fields lead to the increase of dimerization free energies.
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