NUMERICAL STUDY ON THE BUBBLY FLOW GENERATED BY AN AIR BUBBLE MASKER BELT OF A SURFACE SHIP

2021 ◽  
Vol 26 (3) ◽  
pp. 43-53
Author(s):  
I.R. Park ◽  
J.I. Kim ◽  
C.S. Park ◽  
G.D. Kim ◽  
G.T. Yim
Keyword(s):  
Numerical Study ◽  
Bubbly Flow ◽  
Air Bubble ◽  
Surface Ship

A numerical study of resistance and viscous flow around typical benchmark surface ship hull

2011 ◽  
Vol 41 (2) ◽  
pp. 178-193 ◽  
Author(s):  
德成 万 ◽  
Juan WAN DeCheng MA
Keyword(s):  
Viscous Flow ◽  
Numerical Study ◽  
Ship Hull ◽  
Surface Ship

scholarly journals On the numerical study of isothermal vertical bubbly flow using two population balance approaches

2007 ◽  
Vol 62 (17) ◽  
pp. 4659-4674 ◽  
Author(s):  
Sherman C.P. Cheung ◽  
G.H. Yeoh ◽  
J.Y. Tu
Keyword(s):  
Numerical Study ◽  
Bubbly Flow ◽  
Population Balance

scholarly journals A numerical study of single air bubble formation comparison between in viscous liquid and in water

2019 ◽  
Vol 14 (6) ◽  
Author(s):  
Md. Tariqul Islam ◽  
Poo Balan Ganesan ◽  
Md. Masum Billah ◽  
Md. Nasir Uddin
Keyword(s):  
Viscous Liquid ◽  
Numerical Study ◽  
Bubble Formation ◽  
Air Bubble

scholarly journals Experimental and Numerical Study of the Flow and Heat Transfer in a Bubbly Turbulent Flow in a Pipe with Sudden Expansion

Energies ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2735 ◽  
Author(s):  
Pavel Lobanov ◽  
Maksim Pakhomov ◽  
Viktor Terekhov
Keyword(s):  
Heat Transfer ◽  
Liquid Velocity ◽  
Numerical Study ◽  
Bubbly Flow ◽  
Fluid Phase ◽  
Reynolds Stress Model ◽  
Sudden Expansion ◽  
Two Phase ◽  
Carrier Fluid ◽  
Carrier Liquid

The flow patterns and heat transfer of a downstream bubbly flow in a sudden pipe expansion are experimentally and numerically studied. Measurements of the bubble size were performed using shadow photography. Fluid phase velocities were measured using a PIV system. The numerical model was employed the Eulerian approach. The set of RANS equations was used for modelling two-phase bubbly flows. The turbulence of the carrier liquid phase was predicted using the Reynolds stress model. The peak of axial and radial fluctuations of the carrier fluid (liquid) velocity in the bubbly flow is observed in the shear layer. The addition of air bubbles resulted in a significant increase in the heat transfer rate (up to 300%). The main enhancement in heat transfer is observed after the point of flow reattachment.

On the Numerical Study of Bubbly Flow Created by Ventilated Cavity

2010 ◽  
Vol 29-32 ◽  
pp. 143-148
Author(s):  
Min Xiang ◽  
S.C.P. Cheung ◽  
Ji Yuan Tu ◽  
Wei Hua Zhang ◽  
Yang Fei
Keyword(s):  
Flow Field ◽  
Void Fraction ◽  
Numerical Study ◽  
Fluid Model ◽  
Bubbly Flow ◽  
Bubble Diameter ◽  
Flow Region ◽  
Valuable Insight ◽  
Two Phase ◽  
Ventilated Cavity

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.

scholarly journals Study of air-core vortical flow structure induced by a plughole vortex

2017 ◽  
Vol 823 ◽  
pp. 787-818 ◽  
Author(s):  
Rayhan Ahmed ◽  
Heechang Lim
Keyword(s):  
Bubbly Flow ◽  
Bubble Diameter ◽  
Bubble Formation ◽  
Vortical Flow ◽  
Air Bubbles ◽  
Air Bubble ◽  
Naturally Occurring ◽  
Core Method ◽  
Water Head ◽  
Bubble Length

This paper describes a study of the generation of a plughole vortex and its consequences in a drainpipe during drainage of water from a stationary rectangular tank. The critical and minimum depths of water above the inlet of the drainpipe, where a surface dip starts to develop for drainpipes of various diameters, were examined parametrically. This study explored the following naturally occurring phenomena arising from a plughole vortex. (i) A plughole vortex initially causes a surface dip to develop towards the inlet of the drainpipe and as the surface dip approaches the inlet of the drainpipe it creates a droplet-shaped air bubble. (ii) A unique bubble transformation, i.e. from a droplet-shaped to a donut-shaped bubble ring, occurs just after the separation of the droplet-shaped air bubble from the surface dip. (iii) The donut-shaped bubble ring flows with the drain water and initially causes bubbly flow in the drainpipe. (iv) As the water head above the inlet of the drainpipe decreases, the droplet-shaped bubble size increases, and consequently, the bubble ring size increases and causes slug flow in the drainpipe. (v) As the slugs combine, the flow of the draining water eventually becomes annular flow in the drainpipe. Sounds, such as that of instantaneous fizz and bubble sink draining, were observed to be produced as a result of the bubble formation process. Temporal changes in the shape and size of the air bubbles were studied. Within the range of 0.45–0.6, the ratio of the bubble diameter to the bubble length was found to be linearly proportional to the ratio of the water depth to the diameter of the drainpipe. Several drainage cases were simulated numerically to observe the physics of these naturally occurring phenomena. The shapes and sizes of the vortices induced by plugholes have been visualised and analysed using the vortex core method.

Numerical study of homogeneous bubbly flow: Influence of the inlet conditions to the hydrodynamic behavior

2009 ◽  
Vol 35 (12) ◽  
pp. 1077-1099 ◽  
Author(s):  
D. Darmana ◽  
N.G. Deen ◽  
J.A.M. Kuipers ◽  
W.K. Harteveld ◽  
R.F. Mudde
Keyword(s):  
Numerical Study ◽  
Bubbly Flow ◽  
Hydrodynamic Behavior ◽  
Inlet Conditions

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

2011 ◽  
Vol 37 (7) ◽  
pp. 756-768 ◽  
Author(s):  
M. Xiang ◽  
S.C.P. Cheung ◽  
G.H. Yeoh ◽  
W.H. Zhang ◽  
J.Y. Tu
Keyword(s):  
Numerical Study ◽  
Bubbly Flow ◽  
Vertical Pipe ◽  
Ventilated Cavity
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