Rheological properties of CO2 hydrate slurries in presence of Dioctyl sodium sulfosuccinate (AOT) in a dynamic loop for refrigeration application

Rheology of Methane-Hydrate-Slurry Flow in 100% Water Cut System and Influence of Turbulent–Laminar Transition

“…This model assumes cubic packing (52% of the solid concentration) for bedding layers: under this assumption, 3.7 vol % of hydrate can only occupy about 7.1 vol % (≈ 3.7 vol %/0.52) of the system. Furthermore, stationary bedding of hydrate was not observed in the video images during slurry flow, which may encourage that the previous flowloop experiments ,,,− ,,− implicitly assumed independence of flow velocity on the hydrate volume fraction for the slurries actually flowing, i.e., no hydrate bedding or deposition.…”

“…Furthermore, even though the actual volume fraction was 3.7 vol %, the observation region appeared fully filled (Figure e–h). The much higher effective volume may be one of the reasons that the power-law fluid model and Bingham plastic fluid model, which implicitly assume the uniformity of slurry, provided a good fitting to the rheology of hydrate slurries under laminar conditions in many experiments. ,− , Whereas the buoyancy should create a gradient of solid concentration in laminar flow, this effect may be suppressed when the effective volume fraction is high enough.…”

“…In flowloop experiments, gas hydrate slurries, e.g., CH 4 and CO 2 , in water-dominant systems were often assumed to be shear-thinning (power law) ,− or Bingham plastic fluids. , These models provided good fits to the experimental data, but questions about the uniformity of the slurry, related to the particle distribution, may remain. For instance, the concepts described by the classical bedding models, such as Turian and Yuan and Doron and Barnea, appear to conflict the uniformity whereas these classical models do not consider the cohesive force.…”