Jet impingement is an established method of convective heat transfer from the heated surface to the carrier fluid. High heat transfer rates are achieved using impinging jets in solar air heater duct but at the cost of increased friction power penalty. This paper presents thermohydraulic...

A comparative study of various types of artificial roughness geometries in the absorber plate of solar air heater duct and their characteristics, investigated for the heat transfer and friction characteristics, has been presented. The performance evaluation in terms of ηI, ηef and ηII has...

Roughness applied on a broad wall of a solar air heater significantly enhances the heat transfer to the flowing fluid with the moderate rise in fluid friction. It is imperative to select the roughness pattern and its geometrical parameters, which are responsible for the change in fluid flow...

The artificially rib roughened solar air heaters perform thermally better than the conventional flat-plate solar air heater under same operating conditions. However, the artificial rib roughness leads to higher friction factor thereby increasing pumping power. The second law based exergy...

Artificial roughness in the form of repeated ribs has been proposed as a convenient method for enhancement of thermal performance of solar air heaters. This paper presents the experimental investigation of heat transfer and friction factor characteristics of a rectangular duct roughened with...