TITLE:
Shear Stress in Turbulent Flow over Smooth Surfaces
AUTHORS:
Avraham Rami Oron
KEYWORDS:
Turbulent, Shear
JOURNAL NAME:
Open Access Library Journal,
Vol.12 No.9,
September
18,
2025
ABSTRACT: This paper presents a general equation for shear stress in turbulent flow over smooth surfaces at Reynolds numbers ranging from 2 × 103 to 6.5 × 105 (based on the boundary layer thickness and the velocity at its edge). The equation is based on a mathematical analysis using the experimental turbulent flow data in a smooth circular pipe as a reference. The general shear stress equation presented here was tested by solving the momentum equation for several surfaces, including a circular pipe, rectangular ducts, flat plates with and without suction, a very long cylinder perpendicular to the stream, and supersonic turbulent flow over a flat plate and along a circular cylinder. It showed good compatibility with the experimental data.