Abstract
Impinging jets are used industrially in various applications such as heating and cooling. However, multiple impinging jets (MIJ) create a complex flow field due to interference between the individual jets, which hinders heat transfer. In order to solve the problem of heat transfer performance in MIJ, a new control method must be developed. This study introduces intermittent control to 13 hexagonally arranged circular jets to investigate the possibility of control. In the intermittent control, the 13 jets are divided into three groups, and each group is intermittently issued. The distance between jets and the issuing period are changed as control parameters, and the heat transfer characteristics are evaluated using direct numerical simulation (DNS). The time-averaged velocity field revealed the effects of the intermittent period and the distance between jets on the flow characteristics, and the Nusselt number distribution on the wall surface indicated that the proposed method improves the heat transfer characteristics.
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