scholarly journals CFD Prediction and Experimental Measurement of Blade Water Coverage in a Diesel Turbocharger

2012 ◽  
Vol 2012 ◽  
pp. 1-11
Author(s):  
Jun Yao ◽  
Yufeng Yao
Keyword(s):  
Diesel Engine ◽  
Two Phase Flow ◽  
Leading Edge ◽  
Phase Flow ◽  
Cfd Modelling ◽  
Two Phase ◽  
Water Washing ◽  
Numerical Predictions ◽  
Flow Features ◽  
Computational Fluid Dynamics Cfd

A turbocharger unit for diesel engine is often equipped with a built-in online water washing system and its performance is not always satisfactory because of efficiency declination due to deposit accumulated on blade surfaces not being washed away. In this study, a systematic approach of using experimental measurements and computational fluid dynamics (CFD) is adopted to analyse liquid/gas two-phase flow associated with a turbocharger water washing system, in order to understand the underlying flow physics. A medium-sized diesel engine turbocharger configuration is chosen for this purpose. Experiments are focussed on blade surface temperature measurements, while CFD modelling with a coupled Eulerian/Lagrangian method is used for capturing the complex gas/liquid two-phase flow behaviours inside the induction duct and the blade passage. It was found that numerical predictions are in a good agreement with experimental data in terms of temperature distributions of the blade leading edge region and water coverage over the blade ring. Other flow features such as the water droplet trajectories and the particle size distributions are also explored and analysed in further details, and they are useful for understanding the deposit removal mechanism.

Comparison of four types of membrane bioreactor systems in terms of shear stress over the membrane surface using computational fluid dynamics

2013 ◽  
Vol 68 (12) ◽  
pp. 2534-2544 ◽  
Author(s):  
N. Ratkovich ◽  
T. R. Bentzen
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Membrane Fouling ◽  
Two Phase Flow ◽  
Membrane Surface ◽  
Cross Flow ◽  
Membrane Bioreactors ◽  
Phase Flow ◽  
Two Phase ◽  
Computational Fluid Dynamics Cfd

Membrane bioreactors (MBRs) have been used successfully in biological wastewater treatment to solve the perennial problem of effective solids–liquid separation. A common problem with MBR systems is clogging of the modules and fouling of the membrane, resulting in frequent cleaning and replacement, which makes the system less appealing for full-scale applications. It has been widely demonstrated that the filtration performances in MBRs can be greatly improved with a two-phase flow (sludge–air) or higher liquid cross-flow velocities. However, the optimization process of these systems is complex and requires knowledge of the membrane fouling, hydrodynamics and biokinetics. Modern tools such as computational fluid dynamics (CFD) can be used to diagnose and understand the two-phase flow in an MBR. Four cases of different MBR configurations are presented in this work, using CFD as a tool to develop and optimize these systems.

Two-phase flow boiling in 19 mm tube: Experiments and CFD modelling

2016 ◽  
Vol 94 (5) ◽  
pp. 872-885 ◽  
Author(s):  
Madhavi V. Sardeshpande ◽  
Barlev Raymond ◽  
Vivek V. Ranade
Keyword(s):  
Two Phase Flow ◽  
Flow Boiling ◽  
Phase Flow ◽  
Cfd Modelling ◽  
Two Phase

CFD Modelling of Bubbly Flow in Adiabatic Upward Pipe Using a Solver Based on OpenFOAM® With the Quadrature Method of Moments

2014 ◽  
Author(s):  
Carlos Peña-Monferrer ◽  
Alberto Passalacqua ◽  
Sergio Chiva ◽  
José L. Muñoz-Cobo
Keyword(s):  
Method Of Moments ◽  
Two Phase Flow ◽  
Fluid Model ◽  
Bubbly Flow ◽  
Phase Flow ◽  
Computational Results ◽  
Quadrature Method ◽  
Cfd Modelling ◽  
Two Phase ◽  
Quadrature Method Of Moments

An Eulerian-Eulerian approach was used to model adiabatic bubbly flow with CFD techniques. The OpenFOAM® solver twoPhaseEulerFoam was modified to predict upward bubbly flow in vertical pipes. Interfacial force and bubble induced turbulence models are studied and implemented. The population balance equation included in the two-fluid model is solved to simulate a polydisperse flow with the quadrature method of moments approximation. Two-phase flow experiments with different superficial velocities of gas and water at different temperatures are used to validate the solver. Radial distributions of void fraction, air and water velocities, Sauter mean diameter and turbulence intensity are compared with the computational results. The computational results agree well with the experiments showing the capability of the solver to predict two-phase flow characteristics.

scholarly journals A Computation Fluid Dynamic Model for Gas Lift Process Simulation in a Vertical Oil Well

2017 ◽  
Vol 47 (1) ◽  
pp. 49-68 ◽  
Author(s):  
Arash Kadivar ◽  
Ebrahim Nemati Lay
Keyword(s):  
Two Phase Flow ◽  
Fluid Model ◽  
Fluid Dynamic ◽  
Bubble Diameter ◽  
Oil Well ◽  
Phase Flow ◽  
Effective Parameters ◽  
Two Phase ◽  
Numerical Predictions ◽  
Gas Lift

Abstract Continuous gas-lift in a typical oil well was simulated using computational fluid dynamic (CFD) technique. A multi fluid model based on the momentum transfer between liquid and gas bubbles was employed to simulate two-phase flow in a vertical pipe. The accuracy of the model was investigated through comparison of numerical predictions with experimental data. The model then was used to study the dynamic behaviour of the two-phase flow around injection point in details. The predictions by the model were compared with other empirical correlations, as well. To obtain an optimum condition of gas-lift, the influence of the effective parameters including the quantity of injected gas, tubing diameter and bubble size distribution were investigated. The results revealed that increasing tubing diameter, the injected gas rate and decreasing bubble diameter improve gas-lift performance.

scholarly journals CFD modelling of wall steam condensation by a two-phase flow approach

2011 ◽  
Vol 241 (11) ◽  
pp. 4445-4455 ◽  
Author(s):  
S. Mimouni ◽  
A. Foissac ◽  
J. Lavieville
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Steam Condensation ◽  
Cfd Modelling ◽  
Two Phase

scholarly journals Numerical and Experimental Study of Hydraulic Performance and Wear Characteristics of a Slurry Pump

Machines ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 373
Author(s):  
Guangjie Peng ◽  
Long Tian ◽  
Hao Chang ◽  
Shiming Hong ◽  
Daoxing Ye ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Flow Characteristics ◽  
Leading Edge ◽  
Hydraulic Performance ◽  
Cover Plate ◽  
Phase Flow ◽  
Two Phase ◽  
Wear Characteristics ◽  
Solid Liquid ◽  
Blade Leading Edge

The slurry pump is widely used in ore mining, metal smelting, petrochemical, and other industries, mainly to transport fluid media containing large solid particles. Importantly, it is easy to damage the impeller of a slurry pump in the operation process, which greatly affects the performance of the pump. In this paper, a 25 MZ slurry pump was selected as the research object, and the Euler–Euler multiphase flow model was employed to analyze the internal flow characteristics of the slurry pump under the conditions of clear water and solid–liquid two-phase flow. Additionally, the flow characteristics of each part under different flow conditions were studied, and the effects of different particle volume concentrations, particle sizes, and pump speeds on the impeller’s wear characteristics and hydraulic performance were analyzed. In order to verify the reliability and accuracy of the numerical simulation results, clean water and solid–liquid two-phase flow wear tests of the slurry pump were carried out, and the results showed that a high solid volume fraction and solid–phase slip velocity were generated at the junction of the blade leading edge and the rear cover plate, thus leading to easier wear of the blade. Therefore, enhancing the strength of the junction between the blade leading edge and the rear cover plate is beneficial for improving service life and should be considered in the design of slurry pumps.

CFD Modelling of Dispersed Bubble Two-Phase Flow in a Concentric Annulus Pipe

2021 ◽  
Vol 05 (09) ◽  
pp. 82-85
Author(s):  
Fakorede D. ◽  
Nyong O. E. ◽  
Ifere M. ◽  
Bepaye A ◽  
Igbong D.I ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Cfd Modelling ◽  
Two Phase ◽  
Concentric Annulus
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