Abstract
The flow fields of the jets into uniform counterflowing flow include regions of large diffusion. Investigation of that flow fields is important to estimate the characteristics of the diffusion in general. And the results are useful to discuss the fields of combustion, mixing, etc. Recently we found the negative static pressure zone and no recirculation region, and the results differ from the previous models of the flow fields. The large diffusion of the flow fields is caused by a relative diffusion due to the stretching and the deforming of the vortex tubes. In this paper, the large diffusion of the jets into the counterflowing flow is investigated by the measurements of the velocity and pressure fields and by the visualization of the flow fields.
