Proposition of non-standard method useful for viscosity measurements of unstable two-phase systems coupled with examples of its application

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...