  The arrangement of brine above water across a micro porous permeable membrane
is used to study high Rayleigh Number($10^{11}- 10^{10}$) high Schmidt
number(650)turbulent convection. The flux shows 4/3$^{rd}$ scaling with line
plume as the near wall coherent structures. Shifting of multiple large scale
flow cells result in changing near membrane mean shear directions for large
aspect ratios. Lower aspect ratios show single large scale flow cell and
constant sense of mean shear.
