Laminar and turbulent forced convection in accelerating and decelerating curved flows

Abstract

This article is concerned with accelerating and decelerating flows over straight; concave and convex surfaces encompassing laminar and turbulent boundary layers. Flow and heat transfer experiments were carried in a blowing-type, low-speed wind tunnel and measurements indicated that the concave curvature and acceleration caused thinner boundary layers and augmented heat transfer rates, whereas the convex wall and deceleration resulted in the contrary. A new empirical equation. is derived to model the combined effects of boundary layer development, surface curvature and pressure gradient on surface heat transfer values, which coincides with the experimental data within a deviation range of +/- 3 %.