Thermal and flow dynamics of an inclined air heat exchanger equipped with spring turbulators in the transition flow regime.

The research involves an experimental investigation into the performance of a flow assisting air heat exchanger under varying angular orientation and uniform external heat fluxes without and with spring turbulators. The investigation was performed for Reynolds numbers ranging from 511 to 9676 and inclination angle 15° and 30°. Three heat fluxes (2, 3, and 4 kW/m) were applied to the test section to investigate the effect of external surface heating on the range of transition flow regime and thermohydraulic performance.