AN LIF LINE SCAN SYSTEM FOR THE MEASUREMENT OF SCALAR CONCENTRATION IN A CONTINUOUSLY OPERATED STIRRED-TANK

An LIF line scan system is presented and used to obtain unobtrusive me an and angle resolved concentration measurements in a continuously ope rated stirred tank agitated with a single Rushton turbine. The measure ments showed that the trailing vortex structures caused regions of ele vated concentrations gradients and concentration fluctuations between blade passages. In addition, on the centre line of the tank, whilst ma cromixing was always complete, micromixing was less complete than in o ther regions of the tank. Compared to point measurement techniques, th e line scan system made data collection more comprehensive and conveni ent and the determination of a line of data allows the possibility of the correction of beam attenuation and the extension of the technique to a larger scale.