Abstract
Jet is one of the most basic flow used in the industrial field, and improvement of mixing and diffusion by jet is required in industrial equipment. Characteristics such as mixing and diffusion of the jet strongly depend on the large scale vortex structure formed near the outlet, and the mixing performance of the jet can be improved by controlling the vortex structure near the jet outlet with appropriate inflow conditions. In the case of mixing and diffusion in a wide space, a multiple jets are used in many fields in practice. Multiple jets are, unlike jets issued from single nozzle, interfere with each other downstream and strongly influence mixing performance such as entrainment of surrounding fluid and diffusion to surrounding environment. In this study, in order to reduce interference between jets or to use interference actively, intermittent control of jets with varying control frequency and jet spacing was studied using DNS (Direct Numerical Simulation). Statistical mechanical entropy is evaluated to quantify the mixing characteristics of intermittent control. It is confirmed that the mixing efficiency is significantly improved as compared to the non-controlled jet, which suggests that the intermittent control can be expected to help improve the mixing performance of multiple jets.
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