The structure of turbulence in a natural convection boundary layer

The paper reports on investigation into the structure of the turbulence in a natural convection boundary layer on an isothermal vertical surface, based on measurements of the temperature fluctuations. Two point correlations with probe separations in one or more of the three coordinate directions, were used to determine the extent to which the structure of the turbulence is similar to that found in forced flows. Spanwise correlations showed a structure, very similar to the streaks and bursts reported in forced flows, in the region near the wall, but further out the structure was different.