通过时间平均核磁共振成像研究湍流管道流动：速度剖面和湍流强度的测量

Turbulent pipe flow studied by time-averaged NMR imaging: measurements of velocity profile and turbulent intensity.

作者信息

Li T Q, Seymour J D, Powell R L, McCarthy K L, Odberg L, McCarthy M J

机构信息

Department of Chemical Engineering, University of California, Davis 95616.

出版信息

Magn Reson Imaging. 1994;12(6):923-34. doi: 10.1016/0730-725x(94)92033-8.

DOI:10.1016/0730-725x(94)92033-8

PMID:7968291

Abstract

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.

摘要

介绍了一种通过相流编码核磁共振成像在湍流中获得定量测量结果的时间平均方法。利用这种方法可以确定时间平均速度剖面和湍流强度。可视化了在1200至9400雷诺数下由恒定压力梯度驱动的水在管道流动中的时间平均速度剖面。推导了时间平均核磁共振流动图像的像素强度与流动局部湍流强度之间的精确相关性。测量得到的湍流强度与使用其他实验方法获得的已发表数据一致。