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.
Li
T Q
TQ
Department of Chemical Engineering, University of California, Davis 95616.
Seymour
J D
JD
Powell
R L
RL
McCarthy
K L
KL
Odberg
L
L
McCarthy
M J
MJ
D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D012212:Rheology