In the present work, A 2D CFD simulation using ANSYS
FLUENT 15.0 have been performed to investigate the
performance of flat plate solar air heaters with different rib
geometries (artificial roughness) such as semi-circular, circular,
rectangular and triangular (wedge) and hyperbolic rib with flat
tip. In fact, the hyperbolic rib profile is the novelty in this work.
The CFD model of smooth duct is validated with the Dittus-
Boelter Nusselt number correlation and the Blasius equation for
heat transfer and frictional pressure drop respectively. RNG kɛ
model is used for turbulent modelling. The proposed
hyperbolic rib profile gives best performance at low Re
whereas rectangular profile is found to be best at high Re.
papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.