“…The working principle lie in the measurement of the velocity profile, which is specific to a cross-section of pipe and thereby determines the drop in pressure for a specific length. Unlike regular tube viscometry, whose theory is based on volumetric formulas for measuring viscosity data points, tomographic viscometry involves shear rate data points from the viscosity profile [47,48]. The non-invasive and non-destructive manner of operation, as well as the in-line measurement of rheological parameters (e.g., slip velocity, yield stress, and shear viscosity) are the advantageous features of the process.…”