TURBULENT PIPE-FLOW STUDIED BY TIME-AVERAGED NMR IMAGING - MEASUREMENTS OF VELOCITY PROFILE AND TURBULENT INTENSITY

被引：56

作者：

LI, TQ ^{[1
]}

SEYMOUR, JD ^{[1
]}

POWELL, RL ^{[1
]}

MCCARTHY, KL ^{[1
]}

ODBERG, L ^{[1
]}

MCCARTHY, MJ ^{[1
]}

机构：

[1] UNIV CALIF DAVIS,DEPT BIOL & AGR ENGN,DAVIS,CA 95616

来源：

MAGNETIC RESONANCE IMAGING | 1994年 / 12卷 / 06期

关键词：

TIME-AVERAGED NMR IMAGING; PHASE FLOW ENCODING; TURBULENT PIPE FLOW; MEAN VELOCITY PROFILE; TURBULENCE INTENSITY;

D O I：

10.1016/0730-725X(94)92033-8

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

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.

引用

页码：923 / 934

页数：12

共 38 条

[21]

Carr, Purcell, Effects of diffusion on free precession in nuclear magnetic resonance experiment, Phys. Rev., 94, pp. 630-638, (1954)

[22]

Stejskal, Use of spin-echoes in a pulsed magnetic field gradient to study anisotropic, restricted diffusion and flow, J. Chem. Phys., 43, pp. 3597-3603, (1965)

[23]

Nalcioglu, Cho, Measurement of bulk and random directional velocity fields by NMR imaging, IEEE Transactions on Medical Imaging, 1001-1008, pp. 356-360, (1987)

[24]

Townsend, The Structure of Turbulent Shear Flow, (1976)

[25]

Wells, Stock, The effects of crossing trajectories on the dispersion of particles in a turbulent flow, J. Fluid Mech., 136, pp. 31-62, (1983)

[26]

Eckelman, The structure of the viscous sublayer and the adjacent wall region in a turbulent channel flow, Journal of Fluid Mechanics, 65, pp. 439-459, (1974)

[27]

Taylor, Diffusion by continuous movements, Proc. Lond. Math. Soc., 20, pp. 196-211, (1921)

[28]

Hanratty, Latinen, Wilhelm, Turbulent diffusion in particulately fluidized beds of particles, AIChE Journal, 2, pp. 372-380, (1956)

[29]

Baldwin, Walsh, Turbulent diffusion in the core of fully developed pipe flow, AIChE Journal, 7, pp. 53-61, (1961)

[30]

Baldwin, Mickelsen, Turbulent diffusion and anemometer measurements, J. Engin. Mech., 88, pp. 37-69, (1962)

← 1 2 3 4 →