Rheology of water in crude oil emulsions

摘要: Abstract The present paper deals with the rheological study of simplified sea water in crude oil emulsions. This includes viscosity dependence vs. shear rate, creep experiments and oscillatory measurements. Our results show existence a critical volume fraction φc addition to maximum packing φm. marks onset physical contact between droplets. determined thickness hydrodynamic layer due surfactant molecules is shown decrease as increases. On other hand, when emulsions contain an additional surfactant, loss modulus G″ measured at f=1 Hz shows for given strain γmax. Such strain, however, decreases increases remains constant above φ∼φc. Finally, we attempt scale rate values relaxation time from using analogy concentrated macromolecular solutions.