Effect of Transverse Convex Surface Curvature on Turbulent Fluid Flow and Heat Transfer in Concentric Annuli with Moving Cores
Author | : Sang Hun Lee |
Publisher | : |
Total Pages | : 0 |
Release | : 2001 |
ISBN-10 | : OCLC:1372358224 |
ISBN-13 | : |
Rating | : 4/5 (24 Downloads) |
Book excerpt: This study investigates the effect of Transverse Convex Surface Curvature of the inner core (T.C.S.C) on the fully developed fluid flows in a concentric annulus with a moving core, by analytically predicting friction forces, velocity profiles, temperature profiles and heat transfer in terms of convex surface curvature, radius ratio, Prandtl number, Reynolds number and relative velocity. The analytical predictions are produced by a mathematical model based on the variable von Karman constant, kappai, proposed by Kim and Lee [1] and the variable van Driest damping parameter, Ai+, proposed in previous research by Suk [2]. The computer program developed for this study employs a numerical process to match velocity and temperature profiles with force and energy balances and calculates the desired momentum and thermal characteristics. The solutions are found in the case of the heat transfer where the inner core surface is uniformly heated and the outer insulated. It is assumed that the fluid flow is turbulent everywhere and the thermodynamic fluid properties are independent of temperature. It is concluded that in the fully developed turbulent flow in a concentric annulus with a moving core, the effects of Transverse Convex Surface Curvature (T.C.S.C), core velocity and turbulent motion on the momentum and heat transfer characteristics of the flow seem significant.