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Investigation of Turbulence Characteristics of Defect Law Region over Flat plate

평판 위 흐름 Defect Law 영역의 난류 특성 연구

Suh, Sung-Bu;Park, Il-Ryong;Jung, Kwang-Hyo;Lim, Jung-Gwan;Kim, Kwang-Soo;Kim, Jin
서성부;박일룡;정광효;임정관;김광수;김진

  • Received : 2014.03.05
  • Accepted : 2014.08.19
  • Published : 2014.08.30

Abstract

To investigate the turbulence characteristics within the boundary layer over a flat plate, an experimental study was performed using a PIV technique in a circular water channel. For two water velocities, 0.92 and 1.99 m/s, the water velocity profiles were taken and analyzed to determine turbulent characteristics such as the Reynolds stress, Taylor micro-length scale, and Kolmogorov length scale within the defect law region of the boundary layer. These analysis methods may be applied to research on the friction drag reduction technology using micro-bubbles or an air sheet over the surface of a ship's hull, because the physical reason for the friction drag reduction could be found by understanding the variation of the turbulence characteristics and structures in the boundary layer.

Keywords

Turbulent boundary layer;Particle image velocimetry;Reynolds stress;Taylor micro length scale;Kolmogorov length scale

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Acknowledgement

Supported by : 한국학술진흥재단