CFD Approaches for Modelling Bubble Entrainment by an Impinging Jet
نویسندگان
چکیده
منابع مشابه
On the Modelling of Bubble Entrainment by Impinging Jets in Cfd-simulations
This contribution presents different approaches for the modeling of air entrainment under water by plunging jets in CFD codes. In simulations which include the full length of the jet and its environment, the process of bubble generation can not be resolved due to computational limitations. This is why the air entrainment has to be modeled in meso-scale simulations. In the frame of an EulerEuler...
متن کاملPhysics of Particle Entrainment under the Influence of an Impinging Jet
In the laboratory we used an idealized rotorwash flow—an axisymmetric jet impinges normally on a packed bed of cohesionless particles—and measured the spatially varying flow field and entrainment flux under an axisymmetric jet over a range of jet exit velocities and bed materials. We found that the erosion of the bed is driven by turbulent surface shear stress, quantified by the turbulent kinet...
متن کاملAn Experimental Study of Individual Air Bubble Entrainment at a Planar Plunging Jet
A t the impact of a plunging liquid jet with a receiving pool, air bubbles may be entrained if the impact velocity exceeds a critical velocity. New experiments were performed in a two-dimensional plunging jet. The ̄ ow conditions near the inception of air entrainment were investigated. Two mechanisms of air entrainment were visualized at low jet velocities: by elongated air cavity and by foam bu...
متن کاملCfd Simulation of round Impinging Jet and Comparison with Experimental Data
In this work, fluid dynamics of a turbulent round impinging jet has been studied using Computational Fluid Dynamics (CFD) and the results have been compared with experimental data from the literature. The fluid was water with density of 1000 kg/m 3 and the average velocity of the submerged jet was kept constant at 10.7 m/s while the liquid viscosity varied from 1 cP to 100 cP. Different turbule...
متن کاملCfd Analysis of Impinging Axisymmetric Turbulent Fountains
When a positively buoyant vertical fluid jet directed downwards from its source impinges on a horizontal flat surface, the resulting flow is termed an “impinging fountain”. These flows arise in a number of practical situations, for example, in gas metal arc welding (GMAW). Developing a description of this flow presents the researcher with a number of challenges and forms the motivation for this...
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ژورنال
عنوان ژورنال: Science and Technology of Nuclear Installations
سال: 2009
ISSN: 1687-6075,1687-6083
DOI: 10.1155/2009/148436