Abstract: Practical rotating viscometer for studing bubbly oil is established, and the influence of volume fraction of bubble, film thickness and shear strain rate on the viscosity property of bubbly oil is investigated in detail. A general relation of bubbly oil viscosity property was generalized as ηb/ηo =1+ (a bγ-0.01)β, it is proved experimentally that the above relation is valid at any shear strain rate.

Key words: Bubbly oil, Viscosity property, Volume fraction of bubble