Turbulent pipe flow studied by time-averaged NMR imaging: measurements of velocity profile and turbulent intensity.
A time-averaged method to obtain quantitative measurements in turbulent flow by phase flow encoding NMR imaging is introduced. With this method time-averaged velocity profiles and turbulence intensities can be determined. Time-averaged velocity profiles for pipe flow of water driven by a constant pressure gradient at Reynolds numbers from 1200 to 9400 were visualized. A precise correlation between the pixel intensity of the time-averaged NMR flow image and the local turbulence intensity of the flow is derived. The measured turbulence intensities are in agreement with published data obtained using other experimental methods.
Department of Chemical Engineering, University of California, Davis 95616.
T Q
TQ
Li
J D
JD
Seymour
R L
RL
Powell
K L
KL
McCarthy
L
L
Odberg
M J
MJ
McCarthy
D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D012212:Rheology