Parametric CFD Thermal Performance Analysis of Full, Medium, Half and Short Length Dimple Solar Air Tube

In the present decade, research regarding solar thermal air heaters (SAHs) has noticed a continuous progression in thermo-hydraulic performance augmentation approaches. There now exists wide variety of approaches and researchers have designated various structures. Nevertheless, there seems to be no generalization any employed. The numerical investigation reports on characteristics for flow through varied length (full, medium, half, short length) dimple heater (SAH) tube. study highlights recent developments enhanced tubes augment heat transfer SAH. influence different ratio, height ratio (H), pitch (s) been investigated Reynolds number (Re) range from 5000 25,000. Air is used as working fluid. commercial software ANSYS Fluent simulation. shear stress transport (SST) model turbulence model. Thermal energy coefficient increased full-length tube (FLDT), compared medium-length (MLDT), half-length (HLDT) short-length (SLDT). Similarly, more Nusselt (Nu) (H). friction factor decreases with an increase ratio. Nu increases f increasing Re all combinations H s. Low s higher yields high enhancement HT PD. Integration artificial roughness values by 5.12 times 77.23 = 0.07, 1.0 at value 25,000, respectively, regard plain For tested cases, performances (?) are greater than unity.