Ultrasound image velocimetry for rheological measurements

Abstract

Ultrasound image velocimetry (UIV) allows for the non-intrusive measurement of a wide range of flows without the need for optical transparency. In this study, we used UIV to measure the local velocity field of a model drilling fluid that exhibits yield stress flow behavior. The radial velocity profile was used to determine the yield stress and the Herschel-Bulkley model flow index n and the consistency index k. Reference data were obtained using the conventional offline Couette rheometry. A comparison showed reasonable agreement between the two methods. The discrepancy in model parameters could be attributed to inherent differences between the methods, which cannot be captured by the three-parameter model used. Overall, with a whole flow field measurement technique such as UIV, we were able to quantify the complex rheology of a model drilling fluid. These preliminary results show that UIV can be used as a non-intrusive diagnostic for in situ, real-time measurement of complex opaque flow rheology.

Simultaneous Concentration and Velocity Maps in Particle Suspensions under Shear from Rheo-Ultrasonic Imaging

“…UIV and its derivatives have proved successful not only for blood flow measurements [28,29] but also for applications to hydrodynamics [30], to rheology [13,31] or to industrial situations involving optically opaque suspensions [32,33]. These velocimetry techniques rely upon the measurement of local displacements through cross-correlation of successive speckle signals received after successive pulses are sent through the scattering material.…”

Measurement in opaque flows: a review of measurement techniques for dispersed multiphase flows

“…As such, the outcome of UIV is the velocity field of the dispersed phase. For colloidal particles (much smaller than the wavelength of sound), the signal will be speckle-like in nature [101]. For larger particles, the individual particle images can often be distinguished in dilute flows [102].…”

Rheological properties of montmorillonite dispersions in dilute NaCl concentration investigated by ultrasonic spinning rheometry

“…To overcome these limitations and to reveal the rheological characteristics of dispersions with thixotropic behaviors, another rheometry approach was proposed recently in which ultrasonic waves are used (Ouriev and Windhab, 2003;Derakhshandeh et al, 2012;Gurung et al, 2016;Poelma, 2017). A rheometry using ultrasonic velocity profiling (UVP) (Takeda, 2012) was proposed; UVP can measure instantaneous velocity profiles along propagation lines of ultrasonic waves.…”