Sensitivity Test of Jet Velocity and Void Fraction on the Prediction of Rise Height and Performance of a Confined Plunging Liquid Jet Reactor

Abstract

Jet velocity is an important parameter affecting the air entrainment rate of plunging liquid jet processes. While the vast majority of researchers have investigated the effect of jet velocity, only a few of them considered the effect of jet length in calculating the jet velocity at impingement point. This study investigates the difference (ΔV) between the jet velocity at the inception of the nozzle (Vj) and the impingement point (VL) for a range of operating conditions. Furthermore, bubble voidage inside the downcomer, another critical parameter in plunging jets, is estimated using three different voidage equations incorporated inside a momentum balance model to predict the two-phase elevation level (HR) inside the downcomer. Results showed that ΔV is significant (VL > Vj), especially at low jet flow rates and high jet lengths. Generally, the momentum balance model predicted the HR well, and its prediction improves with downcomer diameter. Given that, the model still needs to be refined for more accuracy for a wide range of operating conditions.

Study on the Behavior and State of Viscous Fractured Leakage Bridging and Plugging Slurry during the Pump-In and Pressurization Process

“…When the particle size is 1 mm, the height of settling is equal to the height of the fracture. When the particle size is 1.5~2 mm, the height of particles settling is higher than the height of the fracture, and the distance of particles entering the fracture is continuously extended [17][18][19]. Figure 9 shows the precipitation volume of different particle sizes at 6 s. compared with other particle sizes, the precipitation volume of particles at 0.5 mm is almost negligible, and the particles are evenly dispersed in the wellbore.…”

“…When the particle size is 1 mm, the height of settling is equal to the height of the fracture. When the particle size is 1.5~2 mm, the height of particles settling is higher than the height of the fracture, and the distance of particles entering the fracture is continuously extended [17][18][19].…”

The Law of Gas–Liquid Shear Mixing under the Synergistic Effect of Jet Stirring

“…The material is suspended in the liquid to form a mixture or suspension by means of the stirring action of a paddle. The main purpose is to make the material fully and evenly dispersed in the liquid medium, and finally, strengthen the reaction process by the mixing [17][18][19][20][21][22][23]. There are many types of kettle reactors in the chemical industry, and their structure and appearance are not uniform.…”