TY - JOUR
AU - Syunyaev, Z.
AB - RESEARC UDC 678.01:665.637.3 Yu. I. Merezhko, A. N. Nesterov, and Z. I. Syunyaev Rheological methods are widely used [i, 2] in research on structuring and structure- sensitive properties in petroleum products. The viscous-flow functions for a structured sys- tem may be taken as the free energy, the activation entropy, and the derivatives of these with respect to temperature and shear stress, which provide information on structure formation and decomposition [3]. We have used heavy fuel oils derived from various forms of crude petroleum, which differed considerably in group hydrocarbon compositions (Table i), so it was possible to estimate how the composition of the raw material affected the molecular interactions and the structuring. We used a Reotest-2 rotational viscometer. Table 2 gives the viscosities at various temperatures and shear stresses. These heavy fuel oils are non-Newtonian liquids, and one can only speak of the effective viscosity. Near the setting temperatures, the effective viscosities decrease as the shear stresses increase, because the structures or supermolecular formations are disrupted. Above 50~ Newtonian behavior occurred in the oil from a mixture of West Siberian crudes, so there were no supermolecular structures to be disrupted as the shear stress varied from 1.7 to 230.83 
TI - Structuring and flow energy functions for heavy fuel oil
JF - Chemistry and Technology of Fuels and Oils
DO - 10.1007/BF00724190
DA - 2004-11-17
UR - https://www.deepdyve.com/lp/springer-journals/structuring-and-flow-energy-functions-for-heavy-fuel-oil-ExF2XMpPVU
SP - 198
EP - 201
VL - 26
IS - 4
DP - DeepDyve
ER -