R. Balachandar et al., EXPERIMENTAL-STUDY OF TURBULENT CONCENTRATION FLOW-FIELD IN THE WAKE OF A BLUFF-BODY, Journal of fluids engineering, 119(2), 1997, pp. 263-270
Experiments were conducted to determine the turbulent concentration fi
eld in the wake of a normal flat plate. Dye was introduced behind the
plate as the tracer. The measurement of the dye concentration was carr
ied out using an optical colorimeter in the near wake, covering a dist
ance of five to thirty plate widths downstream of the body. The mean,
r.m.s., and intermittency profiles of the concentration field were obt
ained at a number of cross sections. Phase averaging was also carried
out to determine the structure of the large scale eddies. Typical maxi
mum concentration levels in the core of the eddies were found to be tw
o to four times larger than the corresponding mean values. The widths
of the concentration profiles in the near wake are 1.5 to 2.5 times wi
der than the corresponding widths of the the velocity profiles. The pr
esent dye concentration data obtained for the normal pat plate are uni
que and complement a small number of previous experimental investigati
ons of the scalar field based on temperature measurements in the wake
of circular cylinders.