Laminar flow heat transfer for asymmetrical non-uniform heat flux distributions on horizontal circular tubes

摘要: In this study, the influence of symmetrical and asymmetrical non-uniform heat flux distribution boundaries in terms gravitational field on internal transfer coefficient friction factor a horizontal circular tube was investigated numerically. Of interest buoyancy driven flow laminar regime. Inlet fluid temperature external loss convective also considered. Three-dimensional steady-state numerical simulations were performed using ANSYS Fluent version 14. Circumferential simulated as sinusoidal function incident tube. A steel considered which had wall thickness 5.2 mm, length-to-inner-diameter ratio 160, thermal conductivity 16.27 W/mK. The results showed that average coefficients factors for cases higher than case increased with an increase inlet uniform flux, nonuniform distributions cases. However, decreased coefficient. It found