Abstract
The spatial structure of internal gravity waves and counter-gradient heat flux were investigated in a strongly stably-stratified mixing layer. Multi-point simultaneous measurement was made on its temperature and velocity fields by a rake of 7 cold-and hot-wire system. Streamwise change in temperature spectrum showed that the internal gravity waves developed in the mixing layer and suddenly collapsed in the downstream region. Vertical correlation between the temperature fluctuations became stronger as the internal gravity waves grew downstream. Coherence and phase difference between the temperature fluctuations showed that the collapse of the grownup internal gravity waves started from around the wave front. Nonlinear interaction between the resonant components and their higher harmonics generated negative heat flux by converting large potential energy contained in the waves to turbulent kinetic energy in the turbulence producing process.
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