Abstract
In order to improve the performance of heat transfer with multiple impinging jets(MIJ), we investigate the DNS (direct numerical simulation) of single and two round impinging jets arranged at an inflow of flow field. In addition we introduce the intermittent control of inflow velocity as the new control method. As some parameters of intermittent control, both the period and phase difference between two jets are varied. From the view of timeaveraged velocity distribution of MIJ, it reveals that the generation of flow phemonomena such as up-wash due to the interaction between two jets are reduced through the intermittent control, and that the heat transfer performance i.e. Nusselt number on the impinging plate in both single and multiple cases are improved than that of uncontrolled cases.
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