Heat transfer enhancement in an inclined boomerang groove on a heated channel wall with the end portion oriented along the flow

An anomalous intensification of separated turbulent flow and heat transfer in inclined straight grooves on the wall of the channel and plate is characterized by a weakening of vortex structures and suppression of heat transfer in the end part of the groove. It has been established that the fracture of the end section of the groove with its orientation along the flow in the channel at its optimal relative length leads to the penetration of an intense swirling flow into the end zone of the groove and intensifies heat transfer in it. The relative heat transfer from the surface inside such a boomerang-type groove increases by 1.2 times compared to a straight inclined groove.