Heat-transfer enhancement in turbulent pipe flow with pulsed-jet actuators

The convective heat-transfer enhancement in a fully turbulent pipe flow employing a pulsed, slot jet in crossflow is investigated experimentally. Heat-exchange is critical in numerous industrial applications, impacting the efficiency, performance, and safety of systems ranging from power generation to electronics cooling and aerospace engineering. Convection, particularly in turbulent flows, plays a crucial role in heat-transfer enhancement. Active flow control techniques, such as pulsed-jets, have been explored to enhance convective heat-transfer. However, many existing studies are limited to low Reynolds numbers, limiting their applicability to industrial processes operating at higher Reynolds numbers. The effectiveness of active flow control techniques for heat-transfer enhancement in a high Reynolds number facility, specifically the CICLoPE wind tunnel, is assessed. The study involves developing an impinging jet in crossflow, controlled by frequency and duty cycle, and assessing its impact on convective heat-transfer using infrared thermography on a printed circuit board modelled as a heated thin-foil sensor.