On the terminal velocity of circulating and oscillating liquid drops

Study of newtonian fluid drops rising in water

“…Theoretical studies for bubbles [8,9, 10, I1J and drops [8,12,13,14] yield to those results within certain Jimited ranges. The shape of the bubbles [3, 4,5] was found to vary successively from spherical (D < 0.05 cm) to ellipsoidal (0.05 < D < 0.3 cm) up to spherical cap (D > 1.0 cm).…”

VOF Simulation Studies on Single Droplet Fluid Dynamic Behavior in Liquid–Liquid Flow Process

“…The aspect ratios of the different diameter drops were investigated by simulations and experimentally, as shown in Figure 6. The On the other hand, the rising velocity of drops shows an oscillation in the 3D experiment; the oscillatory motion is due to a sustained pressure distribution over the surface of the drop produced by the asymmetrical and unstable wake behind a drop (Thorsen et al, 1968). However, the loss of one-dimensional (1D) motion in the 2D simulation will affect the surface tension and pressure distribution, and may lead to the rising velocity of the drop not oscillating.…”

“…Clift et al (1978) conducted several studies on drop deformation and dynamic behavior. Many studies have developed a series of correlation models on terminal drop velocities using unpurified (e.g., Hu and Kintner, 1955;Klee and Treybal, 1956) and purified systems (Griffith, 1962;Winnikow and Chao, 1966;Thorsen et al, 1968;Grant, 1971, 1972;Levan and Newman, 1976;Hatanaka et al, 1988;Li et al, 2003). Wegener et al (2007Wegener et al ( , 2009aWegener et al ( , 2010, and Wegener and Paschedag (2011) have conducted a series of theoretical studies on fluid dynamic behavior.…”

Simulating sedimentation of liquid drops

“…The experimental results from Winnikow and Chao [30] indicates that a drop remains spherical once the Bond number, which is equal to the ratio of Weber and Froude number is less than or equal to 0.2, that is when Figure 9 shows the variation of the terminal velocity of ethylene bromide drops in water. The black squares in the diagram represent the experimental results of Thorsen et al [32], who claimed that ethylene bromide with high degree of purity was used for their experiment. This degree of purity is attainable because the drop has high surface tension [31] in water.…”