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QUANTITATIVE VISUALIZATION OF THE NEAR-WALL STRUCTURES IN A FULLY DEVELOPED TURBULENT PIPE FLOW

Z. S. Zhang
Department of Engineering Mechanics, Tsinghua University, Beijing CHINA

B. C. Feng
Department of Engineering Mechanics, Tsinghua University, Beijing CHINA

G. X. Cut
Department of Engineering Mechanics, Tsinghua University, Beijing CHINA

M. Ayrualt
Laboratory of Fluid Mechanics and Acoustics, Ecole Centrale de Lyon, FRANCE

K. S. Hwang
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejeon 305-701, South Korea

Abstract

In this paper the quantitative properties of the near-wall structure in a fully developed turbulent pipe flow are investigated by DPIV and ICV techniques at Reynolds number 5500. The results show that the near-wall structure visualized by conventional dyes is dominated by ejection events. The quantitative measurements of velocity fluctuations inside the structure indicates the interpretation of flow visualization pictures should be with caution.