Studv on Turbulent Coherent Structure of Buoyant Jet by LIF Visualization and Scanning PIY Measurement

Abstract

In the present paper, simultaneous measurement of velocity and concentration field in the initial region of a buoyant jet in stagnant surrounding water was carried out using a scanning LIF and PIV technique. This technique allows the simultaneous measurement of velocity and concentration in the three-dimensional field. The result indicates that the coherent structure plays an important role in the momentum and mass transfer in the buoyant jet. It is also found that the analogy between the momentum and mass transfer does not exit in the instantaneous structure of velocity and concentration field, although the global structure is similar.