Error in Concentration Measurements Using Sampling Probes

抄録

In axisymmetrical jets of KC1 solution emerging into otherwise quiescent water, samples were sucked through capillaries and the concentration of material (KC1) contained in the nozzle fluid was determined from the electric conductivuty of the sample. From the experimental results using four capillaries with different diameters, it was found that the concentration or a sample is equal to that of the measuring point without disturbance only when the sampling velocity is equal to that at the measuring point. Dimensional analysis is made to investigate the error in measured concentration (e.g., sample concentration) and an experimental formula is proposed to estimate the error in the sampling method applied to concentration measurements in a shear flow with a concentration gradient.