Numerical Investigation of Liquid-Liquid Coaxial Flows Available to Purchase

This paper presents numerical results of the interfacial dynamics of axisymmetric liquid-liquid flows when the more dense liquid is injected in with parabolic inlet velocity profile. The flow dynamics are studied as a function of the individual phase Reynolds numbers, viscosity ratio, velocity ratio, Bond number, and Capillary number. The flows have been categorized as “necking” and “swelling” based on whether the injected fluid radius is smaller or larger than the injection port radius. The jet has been observed to neck when the average inlet velocity ratio is less than unity. The outer fluid velocity has a significant effect on the shape and evolution of the jet as it progresses downstream. As the outer liquid flow rate is increased, the intact jet length is stretched to longer lengths while the jet radius is reduced due to interfacial stresses. The jet radius appears to increase with increase in Bond number and viscosity ratio while it is nearly invariant with changes in Capillary number. The results of numerical simulations using FLUENT^® agree well with the results of experimental measurements and the results of self-similar solution.