Numerical simulation of violent bubble motion

2004 ◽  
Vol 16 (5) ◽  
pp. 1610-1619 ◽  
Author(s):  
Wang Qian Xi
Keyword(s):  
Numerical Simulation ◽  
Bubble Motion

scholarly journals Numerical Simulation of Bubble Motion in Horizontal Reducer Pipelines

2011 ◽  
Vol 5 (4) ◽  
pp. 517-529 ◽  
Author(s):  
Wenqi Yuan ◽  
Suiqing Liu ◽  
Shuping Li ◽  
Tao Tao ◽  
Kunlun Xin
Keyword(s):  
Numerical Simulation ◽  
Bubble Motion

Development of Prediction Technology of Two-Phase Flow Dynamics Under Earthquake Acceleration: (12) Bubble Motion Along the Flow in Structure Vibration

2014 ◽  
Author(s):  
Yuki Kato ◽  
Rie Arai ◽  
Akiko Kaneko ◽  
Hideaki Monji ◽  
Yutaka Abe ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Velocity Field ◽  
Test Section ◽  
Two Phase Flow ◽  
Flow Behavior ◽  
Bubbly Flow ◽  
Experimental Results ◽  
Phase Flow ◽  
Bubble Motion ◽  
Two Phase

In a nuclear power plant, one of the important issues is an evaluation of the safety of the reactor core and its pipes when an earthquake occurs. Many researchers have conducted studies on constructions of plants. Consequently, there is some knowledge about earthquake-resisting designs. However the influence of an earthquake vibration on thermal fluid inside a nuclear reactor plant is not fully understood. Especially, there is little knowledge how coolant in a core response when large earthquake acceleration is added. Some studies about the response of fluid to the vibration were carried out. And it is supposed that the void fraction and/or the power of core are fluctuated with the oscillation by the experiments and numerical analysis. However the detailed mechanism about a kinetic response of gas and liquid phases is not enough investigated, therefore the aim of this study is to clarify the influence of vibration of construction on bubbly flow behavior. In order to investigate the influence of vibration of construction on bubbly flow behavior, we visualized bubbly flow in pipeline on which sine wave was applied. In a test section, bubbly flow was produced by injecting gas into liquid flow through a horizontal circular pipe. In order to vibrate the test section, an oscillating table was used. The frequency and acceleration of vibration added from the oscillating table was from 1.0 Hz to 10 Hz and . 0.4 G (1 G=9.8 m/s2) at each frequency. The test section and a high speed video camera were fixed on the oscillating table. Thus the relative velocity between the camera and the test section was ignored. PIV measurement was also conducted to investigate interaction between bubble motion and surround in flow structure. Liquid pressure was also measured at upstream and downstream of the test section. The effects of oscillation on bubbly flow were quantitatively evaluated by these pressure measurements and the velocity field. In the results, it was observed that the difference of bubble motion by changing oscillation frequency. Moreover it was suggested that the bubble deformation is correlated with the fluctuation of liquid velocity field around the bubble and the pressure gradient in the flow area. In addition, these experimental results were compared with numerical simulation by a detailed two-phase flow simulation code with an advanced interface tracking method, TPFIT. Numerical simulation was qualitatively agreed with experimental results.

scholarly journals Numerical Simulation of Bubble Motion about a Grid Spacer in a Rod Bundle

2009 ◽  
Vol 3 (2) ◽  
pp. 393-404 ◽  
Author(s):  
Zheng ZHANG ◽  
Shigeo HOSOKAWA ◽  
Kosuke HAYASHI ◽  
Akio TOMIYAMA
Keyword(s):  
Numerical Simulation ◽  
Bubble Motion ◽  
Rod Bundle

Numerical simulation of gas bubble motion in a flow-through resonator

2013 ◽  
Vol 59 (4) ◽  
pp. 393-398 ◽  
Author(s):  
V. A. Tikhonov ◽  
I. N. Didenkulov ◽  
N. V. Pronchatov-Rubtsov
Keyword(s):  
Numerical Simulation ◽  
Gas Bubble ◽  
Bubble Motion ◽  
Flow Through

Numerical simulation of single bubble motion in ionic liquids

2010 ◽  
Vol 65 (22) ◽  
pp. 6036-6047 ◽  
Author(s):  
Xiaoling Wang ◽  
Haifeng Dong ◽  
Xiangping Zhang ◽  
Liang Yu ◽  
Suojiang Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Ionic Liquids ◽  
Single Bubble ◽  
Bubble Motion

Numerical Simulation on the Dynamics for the Ultrasonic Cavitation Bubble in Chitosan Solution

2013 ◽  
Vol 275-277 ◽  
pp. 628-634
Author(s):  
Yong Chun Huang ◽  
Yu Wu ◽  
Feng Yang
Keyword(s):  
Numerical Simulation ◽  
Cavitation Bubble ◽  
Ambient Pressure ◽  
Bubble Radius ◽  
Chitosan Solution ◽  
Ultrasonic Cavitation ◽  
Single Frequency ◽  
Bubble Motion ◽  
Dual Frequency ◽  
Cavitation Intensity

In order to understand the influencing factors and laws on the ultrasonic cavitation dynamics in chitosan solution, numerical simulation of cavitation bubble motion had been performed based on Rayleigh-Plesset equation and the equation was solved by using 4~5 order Runge–Kutta algorithm. By numerical simulation the effects of frequency and intensity of ultrasonic, ambient pressure, initial bubble radius, concentration and temperature of solution, dual-frequency ultrasonic on the motion of cavitation bubble were discussed. The results show that for improving the effect of cavitation in chitosan solution, ultrasonic cavitation should be under the conditions of lower frequency, lower intensity, lower ambient pressure, smaller initial cavitation bubble, moderate temperature of solution and lower concentration. It is also found that the cavitation intensity due to dual-frequency ultrasonic is stronger than that of single-frequency ultrasonic.

Sign in / Sign up

Export Citation Format

Share Document