Measurements of the mixture fraction properties of plane buoyant turbulent
adiabatic wall plumes (adiabatic wall plumes) are described, emphasizing co
nditions far from the source where self-preserving behavior is approximated
. The experiments involved helium/air mixtures rising along a smooth, plane
and vertical wall. Mean and fluctuating mixture fractions were measured us
ing laser-induced iodine fluorescence. Self-preserving behavior was observe
d 92-155 source widths above the source, yielding smaller normalized plume
widths and near-wall mean mixture fractions than earlier measurements. Self
-preserving adiabatic wall plumes mix slower than comparable free line plum
es (which have 58 percent larger normalized widths) because the wall preven
ts mixing on one side and inhibits large-scale turbulent motion. Measuremen
ts of probability density functions, temporal power spectra, and temporal i
ntegral scales of mixture fraction fluctuations are also reported.