Rapid MRI and velocimetry of cylindrical Couette flow.
A narrow-gap, temperature-controlled Couette flow rheometer has been developed to study fluid velocities within the annular gap between two concentric cylinders by nuclear magnetic resonance (NMR) imaging and velocimetry. Alternative pulsed-field-gradient-based nuclear magnetic resonance imaging strategies which may be used for measurement of velocity within the Couette flow device have been evaluated. These include two-dimensional (2-D) imaging techniques with acquisition times of several minutes and a one-dimensional (1-D) projection method which exploits the symmetry of the device to reduce overall measurement time to less than 1 min. Velocity measurements made using each technique are presented for a Newtonian fluid undergoing Couette flow at shear rates of approximately 20 and 60 s(-1).
Hanlon
A D
AD
Herchel Smith Laboratory for Medicinal Chemistry, University of Cambridge, School for Clinical Medicine, UK.
Gibbs
S J
SJ
Hall
L D
LD
Haycock
D E
DE
Frith
W J
WJ
Ablett
S
S
D001783:Blood Flow Velocity; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods; D008955:Models, Cardiovascular; D012212:Rheology / Q000295:instrumentation