TY - JOUR
T1 - Rheological properties of super critical CO2 with Al2O3
T2 - Material type, size and temperature effect
AU - Mahdavi, Ehsan
AU - Khaledialidusti, Rasoul
AU - Barnoush, Afrooz
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - CO2 liquid is applied as an Enhanced Oil Recovery (EOR) method in oil reservoirs to increase the displacement efficiency. Because of the high temperature and pressure in the reservoirs, the viscosity of the CO2 decreases leading to poor macroscopic sweep efficiency. We study the effect of morphology of aluminum oxide nanoparticle (Al2O3 NP) on the rheological properties of super critical (SC)-CO2 such as viscosity and self-diffusion coefficient using molecular dynamic (MD). We investigate these properties in detail for relevant temperature (350, 380, and 410) K, pressure, 200 bar, and spherical diameter (1.0, 2.0, and 3.0 nm) at 1% volume fraction. Molecular dynamic (MD) simulates Al2O3 SC-CO2 nanofluid by using two force fields such as condensed-phase molecular potentials for atomistic simulation studies (COMPASS) and Charge optimization many body (COMB). The results show that the viscosity of the nanofluid has a direct proportional to temperature and reversely proportional to NP size. Moreover, NP-based material and NP shape exhibit significant effect of enhancement in the nanofluid viscosity in comparison with the cylindrical CuO NP in our previous study. The relative viscosity is enhanced almost 3.6 times for smallest NP at 380 K. Also, implementing 1.0 nm Al2O3 SC-CO2 nanofluid improves the relative viscosity from 1.94 to 3.59 and then to 3.67 by increasing temperature from 350 to 380 to 410 K.
AB - CO2 liquid is applied as an Enhanced Oil Recovery (EOR) method in oil reservoirs to increase the displacement efficiency. Because of the high temperature and pressure in the reservoirs, the viscosity of the CO2 decreases leading to poor macroscopic sweep efficiency. We study the effect of morphology of aluminum oxide nanoparticle (Al2O3 NP) on the rheological properties of super critical (SC)-CO2 such as viscosity and self-diffusion coefficient using molecular dynamic (MD). We investigate these properties in detail for relevant temperature (350, 380, and 410) K, pressure, 200 bar, and spherical diameter (1.0, 2.0, and 3.0 nm) at 1% volume fraction. Molecular dynamic (MD) simulates Al2O3 SC-CO2 nanofluid by using two force fields such as condensed-phase molecular potentials for atomistic simulation studies (COMPASS) and Charge optimization many body (COMB). The results show that the viscosity of the nanofluid has a direct proportional to temperature and reversely proportional to NP size. Moreover, NP-based material and NP shape exhibit significant effect of enhancement in the nanofluid viscosity in comparison with the cylindrical CuO NP in our previous study. The relative viscosity is enhanced almost 3.6 times for smallest NP at 380 K. Also, implementing 1.0 nm Al2O3 SC-CO2 nanofluid improves the relative viscosity from 1.94 to 3.59 and then to 3.67 by increasing temperature from 350 to 380 to 410 K.
KW - Material type
KW - Nanofluid
KW - Nanoparticle
KW - Thermosphysical
KW - Viscosity
UR - http://www.scopus.com/inward/record.url?scp=85067364953&partnerID=8YFLogxK
U2 - 10.1016/j.molliq.2019.111037
DO - 10.1016/j.molliq.2019.111037
M3 - Article
AN - SCOPUS:85067364953
SN - 0167-7322
VL - 289
JO - Journal of Molecular Liquids
JF - Journal of Molecular Liquids
M1 - 111037
ER -