Numerical Investigation of the Impingement Cooling Characteristics of Sweeping Jets with Phase Change

This study investigates the cooling features of sweeping jets with phase changes, providing insights into how parameters affect heat transfer. The study aims to improve heat transfer by investigating the cooling effects of a sweeping jet impinging on a concave wall. The Eulerian-Lagrangian particle tracking method was used to examine the impact of Reynolds number, droplet diameter, mist capacity, and impingement distance on heat transfer properties during the sweeping jet impingement cooling. Increasing the Reynolds number from ۲۰,۰۰۰ to ۳۵,۲۰۰ results in a ۷.۱% and ۳.۳% decrease in average temperature at the axial centerline of the impingement wall, attributed to the cooling effect from droplet phase change. Decreasing droplet diameter from ۲۰ µm to ۱۰ µm reduces temperature amplitude by ۱۱K. At ۵% and ۷.۵% mist ratios, the cooling performance is similar to that of dry air. However, a mist injection of ۱۰% significantly amplifies the cooling effect by ۱۸.۸%, providing a more efficient cooling experience. This investigation provides essential perspectives on impingement cooling, offering insights into the impact of various parameters on heat transfer enhancement.

کلیدواژه ها:

Sweeping jets ، Impingement cooling ، Phase change ، Water vapor ، Reynolds number