... height on the free surface as the hydrofoil approaches. The study indicates two gas entrainment mechanisms when the wave breaks. A quasi-steady state is observed for both the total entrained volume and quantity of entrained bubbles. The vortical wake of the hydrofoil leads to the rapid disappearance...

... in the breaking and rolling of the free surface. This interaction generates widespread liquid splashing above the waterline, along with the entrainment of a significant volume of gas into the submerged region. In the midship area, the interaction between ship-induced waves and ambient waves leads to a coupled...

... ABSTRACT The purpose of the study is to discuss the air entrainment effect of pump impeller operation under different water depths. During pump operation, the rapid change in pressure due to blade rotation causes bubble formation in the liquid, known as cavitation. When cavitation occurs...

... Abstract High-fidelity simulations of plunging breaking waves are performed through direct numerical simulations of the two-phase air-water flow. We investigate how air is entrained during plunging breaking waves in the present study. It is responsible for the formation of numerous bubbles...

... is a very common phenomenon when a ship sailing in the open sea. The breaking bow waves are very complicated which include water overturning, plunging, water droplets, air entrainment, etc. In addition, the breaking phenomenon can be significantly changed when the ship is moving with different speeds...

... ABSTRACT The prediction of wastewater movement, which is in the form of jet, is of great importance for the design of wastewater discharge project. A novel integral model is developed for the jet discharged into wave and tidal current environment. In the model, an entrainment closure approach...

... ABSTRACT Vortex connections at surface are fundamental and prominent features in free surface vertical flows. Such connections are characterized by strong surface tension and air entrainment. In this paper, a primary objective is to understand the detailed mechanism of air entrainment induced...

... for offshore gas wells to calculate critical gas flow rate on the basis of condition at the separator without considering the different temperature and pressure distribution between onshore and offshore gas wells. dangerous position droplet entrainment flow metering diameter prediction droplet...

...Numerical Study of Air Entrainment and Bubble Plume Dynamics under Breaking Waves Lian Tang, Onyx W.H Wai Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong ABSTRACT In this study, an air entrainment model based on the turbulence production...

... ABSTRACT In this paper lock-release density currents moving on flat and upsloping beds are investigated by laboratory experiments and numerical simulations. Numerical simulations were carried out by a two-layer shallow-water model, testing two different entrainment relations: a modified form...

... with the Gaussian assumptions on vertical and horizontal quantities of the excess velocity and the concentration for near field. In which entrainment coefficients are adopted to simulate the mixing mechanism for turbulent closure through the entrainment functions. Next, a far field model is developed by using...

... of entrainment because the frame of reference is attached on the underwater vehicle. Compared with a moving boundary method, the method presented need not to reconstruct meshes, and can simulate wind/water tunnel tests and rotating arm tank tests at less efforts. The computational results for a flat type...

... the surrounding ecosystem and the environment. For the reasons described above, such flows have been extensively studied. Turner (1986) surveyed many different kinds of entraining flow such as buoyant jet and plume, and showed that entrainment assumption is useful in diverse contexts. Tian and Roberts (2003...

... (1986), Dermissis (1990), Grubert (1989) and Foo et al (1995). From these experiments a number of dimensionless parameters which influence the mixing processes and entrainment rates have been found. There is little agreement on the actual equations to describe the rate of entrainment. Considerable...

... production monitoring entrainment aeration process capacitance production control holdup gas entrainment rate liquid velocity production logging upstream oil & gas reservoir surveillance fraction pipe conductance gas entrainment void fraction slug flow experiment liquid...