Discrete Wavelet Analysis of Wall Shear Stress with Micro Shear Stress Sensor

Abstract

Stripe structure in turbulent boundary layer has been clearly visualized by discrete wavelet transform based on the shear stress data using MEMS(Micro-Electro-Mechanical-Systems). The chip is designed and fabricated by surface micromachining technology. The characteristics of high shear stress streaks were described with statistics. Physical quantities associated with the high shear stress streaks such as their length, width and peak shear stress level, were obtained.