On the numerical study of bubbly flow created by ventilated cavity in vertical pipe

The aim of the study was to develop a numerical model to reproduce the bubbly flow field created by ventilated cavity which includes three different regions. The model was established based on the Eulerian-Eulerian two-fluid model coupled with a population balance approach which is solved by the Homogeneous Multiple-Size-Group (MUSIG) model to predict bubble size distribution. Base on the model, the simulation was carried out at the experimental condition of Su et al. (1995). Firstly three regions were successfully captured proved by the spatial voidage distribution and streamline shape. Then distributions of void fraction and Sauter mean bubble diameter at various sections below the cavity corresponding to three regions respectively were plotted against experimental data. A close agreement was observed in the void fraction distribution which indicates that qualitative details of the structure of the two-phase flow field below the cavity was successfully produced. The Sauter mean bubble diameter in the pipe flow region was under-predicted for about 10%. In conclusion, the proposed model was validated in predicting the multi-region flow field below the ventilated cavity which will provide a valuable insight in designing and controlling of the two phase systems with the detailed flow field information obtained.

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95/00721 Numerical study of transient conjugated mixed convection in a vertical pipe

Fuel and Energy Abstracts ◽

10.1016/0140-6701(95)95976-9 ◽

1995 ◽

Vol 36 (1) ◽

pp. 42

Keyword(s):

Mixed Convection ◽

Numerical Study ◽

Vertical Pipe

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Effect of Attack Angle on the Bubbly Flow Downstream of Partially Ventilated Cavity.

Proceedings of the 8th International Symposium on Cavitation ◽

10.3850/978-981-07-2826-7_211 ◽

2012 ◽

Author(s):

M. Xiang ◽

F. Hu

Keyword(s):

Bubbly Flow ◽

Attack Angle ◽

Ventilated Cavity

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Three-dimensional numerical study of mixed convection within a ventilated cavity (Shape ‘ L ‘) crossed by a nanofluid under the effect of a magnetic field

MATEC Web of Conferences ◽

10.1051/matecconf/202030701027 ◽

2020 ◽

Vol 307 ◽

pp. 01027

Author(s):

S. KHERROUBI ◽

K. RAGUI ◽

N. LABSI ◽

Y.K. BENKAHLA ◽

A. BOUTRA

Keyword(s):

Magnetic Field ◽

Mixed Convection ◽

Volume Fraction ◽

Numerical Study ◽

Vertical Wall ◽

Three Dimensional ◽

Convection Heat Transfer ◽

Left Wall ◽

Ventilated Cavity ◽

The Right

The present work is dedicated to the three-dimensional numerical study of mixed convection heat transfer, taking place within a ventilated cavity (of shape L) crossed by Cu-water nanofluid. The enclosure is subjected to the action of a magnetic field. The ventilation is assured by two openings of the same size. The cold flow enters by an opening practiced at the top of the left wall, and exits by another opening practiced at the bottom of the right vertical wall. All the cavity walls are maintained at the same temperature, superior to that of the entering flow, except the side walls which are considered as adiabatic. The control parameters are: the Reynolds number and the Hartmann number as well as the nanoparticles volume fraction.

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