Host: The Japan Society of Mechanical Engineers
Name : Mechanical Engineering Congress,Japan
Date : September 11, 2016 - September 14, 2016
Jet flow is one of the most basic fluid flow used in industrial field. It is widely used in applications including heating, cooling and mixing processes, which demands an improvement in efficient mixing by jet flow. Various properties and characteristics of diffusion and mixing of the jet flow are, however, depending significantly on the large-scale vortex structures formed near jet nozzle. Hence, controlling jet flow by defining appropriate flow outlet condition, large-scale vortex structures are induced at region nearby the nozzle, which from this, improvement in efficient mixing can be expected. In order to develop a new mixing procedure, a direct numerical simulation (DNS) of dynamic controlled free jets was conducted. To achieve a high accurate computation, space discretization method was performed using the hybrid scheme consisting sine or cosine series and 6th order compact scheme. The dynamic control proposed here is rotating jet which is rotated unidirectionally around streamwise direction. According to the instantaneous vortex structures, shown in Figure 1, it is found that the flow pattern changes considerably with the rota ting frequency and its control radius.
