Dynamic Viscosity of Methane Hydrate Systems from Non-Einsteinian, Plasma-Functionalized Carbon Nanotube Nanofluids ...

• Main Authors: McElligott, Adam, Guerra, André, Du, Chong Yang, Rey, Alejandro D., Meunier, Jean-Luc, Servio, Phillip
• Format: Text
• Language: unknown
• Published: arXiv 2023
• Subjects: Applied Physics physics.app-ph; FOS Physical sciences; Methane hydrate
• Online Access: https://dx.doi.org/10.48550/arxiv.2306.16253; https://arxiv.org/abs/2306.16253

The viscosity of oxygen-functionalized multi-walled carbon nanotube (O-MWCNT) nanofluids was measured for concentrations from 0.1 to 10 ppm under conditions of 0 to 30 MPag pressures and 0 to 10 C temperatures. The presence of O-MWCNTs did not affect the temperature dependence of viscosity but did reduce the effective viscosity of solution due to cumulative hydrogen bond-disrupting surface effects, which overcame internal drag forces. O-MWCNTs added a weak pressure dependence to the viscosity of solution because of their ability to align more with the flow direction as pressure increased. In the liquid to hydrate phase transition, the times to reach the maximum viscosity were faster in O-MWCNT systems compared to the pure water baseline. However, the presence of O-MWCNTs limited the conditions at which hydrates formed as increased nanoparticle collisions in those systems inhibited the formation of critical clusters of hydrate nuclei. The times to viscosity values most relevant to technological applications ...