Mixing Characteristics in Jet Mixing

The quantitative relation governing the blending time in jet mixing was investigated experimentally by using sodium chloride and sodium hydroxide as tracer. The experiments were carried out in two cylindrical vessels with diameter 0.4 and 1m., respectively. Diameter ratios of tank to nozzle were varied from 36 to 400. Most of liquids used in the tests were tap water and a few were Ucon (Polyalkylene glycol synthetic lubricant) aqueaous solution.It was found that mixing time was independent of the angle of inclination of nozzle. Based on the assumption that mixing time is the function of the mean velocity of liquid across nozzle, the dimensions of nozzle and vessel and the physical properties of liquid, a dimensionless equation has been developed which expresses m ixing time number T as a function of NRen and scale ratios. At NRen ranging from 5×103 to 1×105, T became independent of NRen and the equation was found to be of the same type as that obtained by others for Larger tank blending. It also suggested that the blending of liquid with impeller could be explained with this equation.