Experimental Investigation on Jet Mixing of Homogeneous Liquids

Abstract

The term mixing implies taking at least two separate phases and causing them to distribute randomly through one another. In jet mixers, a fast moving jet stream of liquid is injected into a slow moving or stationary bulk liquid. The relative velocity between the jet and bulk liquid creates a turbulent mixing layer at the boundary. This mixing layer grows in the direction of the jet flow. A very few works have been reported on jet mixer with top entry nozzle. Hence, a systematic work has been undertaken to study the mixing time of jet mixer with top entry nozzle. Experiments were conducted using sodium hydroxide and sodium chloride as the tracer to find the mixing time for particular concentration by conductivity. The flow rates maintained in the jet mixers were 60, 70 and 80 LPM. The solid dosage of sodium hydroxide and sodium chloride added in the jet mixer were in the multiples of their molecular weight. The effect of flow rates, solid dosage and hold up on mixing time characteristics were studied. The results of the study showed that an increase in the flow rate was found to reduce the mixing time. Also, the mixing time decreases with increase in solid dosage value of sodium hydroxide and sodium chloride at higher flow rates i.e 80 LPM.