Experimental investigation on the chaotic phenomena in the wake of a natural thermal convection flow

Chaotic phenomena in the wake of thermal convection flow fields above a hea ting flat plate were investigated experimentally. A newly developed electro n beam fluorescence technique (EBF) was used to simultaneously measure dens ity fluctuation at 7 points in a cross section above the plate. Correlation dimensions, intermittence coefficients, Fourier spectrum have been obtaine d for different Grashof numbers. Spatial distribution of correlation dimens ions are presented. The experimental result shows that there is a certain r elationship between the density fluctuation and the Gr number. And time-spa cial characteristic of chaos evolution is also given.