LAUSR

Abstract A tubular rheometer was proposed for testing rheological properties of heterogeneous two-phase systems flowing through a pipe. The paper describes the idea of its design and assembly in a flow system. The research methodology and guidelines for interpretation of measurement data are given. Based on the study performed for the water-oil system, it was demonstrated that the use of standard rotational rheometers could not provide similar measuring possibilities. It was possible to determine the rheological characteristics of unstable two-phase mixtures and variability in viscosity in the conditions of actual flow. The interpretation of the measurement results also provided unusual means to identify the phase inversion phenomenon. The areas of application of the proposed method extend beyond research of water-oil systems and scope of experiments reported in this paper. Despite the focus on a specific mixture and its exceptional characteristics, the study also demonstrated other areas of application of this method.