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Keywords: bubbles
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Journal Articles
Article Type: Research Papers
J. Fluids Eng. December 2011, 133(12): 121305.
Published Online: December 23, 2011
...Arvind Jayaprakash; Sowmitra Singh; Georges Chahine The dynamics of a bubble in a dilute bubbly water-air mixture is investigated experimentally and the results compared with a simple homogeneous compressible fluid model in order to elucidate the requirements from a better advanced numerical...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. December 2011, 133(12): 121302.
Published Online: December 20, 2011
...Reni Raju; Sowmitra Singh; Chao-Tsung Hsiao; Georges Chahine (1) Background. Bubbly flows are used in a wide variety of applications and require accurate modeling. In this paper, three modeling approaches are investigated using the geometrically simple configuration of a gas bubble strongly...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. November 2011, 133(11): 111303.
Published Online: November 11, 2011
... associated with the attached cavitation instability has been identified as a new typology of cavitation thermal effects. In this case, the inhibition of the bubble growth due to thermal effects can be detected by the reduction of the performance degradation usually associated with this type of instability...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. September 2011, 133(9): 091303.
Published Online: September 15, 2011
...M. E. Shawkat; C. Y. Ching The liquid turbulence kinetic energy transfer between the liquid and gas phases was investigated for upward air-water bubbly flow in a 200 mm diameter pipe. The liquid and gas axial momentum equations were analyzed to estimate the interfacial drag from experimental...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. September 2011, 133(9): 091304.
Published Online: September 15, 2011
... the bubble chord length distribution for each flow condition. The measured experiment matrix comprised test cases at different inlet pressure, ranging from 200 kPa up to 950 kPa. A total number of 42 different flow conditions with superficial liquid velocities from 0.23 m/s to 2.5 m/s and superficial gas...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. August 2011, 133(8): 081301.
Published Online: August 16, 2011
... Towing Tank Conference , St Johns, NF , August. 12 05 2010 08 06 2011 16 08 2011 16 08 2011 boundary layer turbulence bubbles cavitation external flows flow simulation hydrodynamics numerical analysis two-phase flow viscosity vortices Cavitation...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. May 2011, 133(5): 051104.
Published Online: June 7, 2011
... pressure in the stator are performed along with high-speed flow visualizations in the vaneless gap with the help of air bubbles injection. When starting from the best efficiency point (BEP) and increasing the impeller speed, a significant increase of the pressure fluctuations is observed mainly...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. April 2011, 133(4): 041201.
Published Online: May 16, 2011
... , varying from 0 to 5. The diagnostic is done by flow visualization using hydrogen bubble technique and quantitative measurements using a particle image velocimetry technique. We present the global view of the wake structure at the three Reynolds numbers and various rotation rates. Vortex shedding activity...
Journal Articles
Article Type: Technical Briefs
J. Fluids Eng. April 2011, 133(4): 044503.
Published Online: May 12, 2011
...Alexander G. Bick; William D. Ristenpart; Ernst A. van Nierop; Howard A. Stone We recently discovered that bubble formation can be substantially prevented when an aqueous solution is sprayed into a bath of the same solution provided that any two consecutive drops impacting the same surface location...
Topics: Nozzles, Bubbles
Journal Articles
Article Type: Research Papers
J. Fluids Eng. March 2011, 133(3): 031301.
Published Online: March 15, 2011
... and to the dispersion of the spray. The model also accounts for the break-up and coalescence effects of bubbles and droplets. Our investigation reveals that the conical nozzle attachments act as spray limiters by reducing the natural expansion angle of a spray. Also, the droplets produced by the nozzle with a conical...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. March 2011, 133(3): 031302.
Published Online: March 15, 2011
...Ali Benhmidene; Bechir Chaouachi; Mahmoud Bourouis; Slimane Gabsi In the present study, the ammonia-water mixing flow in a bubble pump is numerically simulated. The flow patterns of a two-phase flow in a bubble pump were studied under different conditions of heat flux and tube diameter. A one...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. February 2011, 133(2): 021303.
Published Online: March 2, 2011
... 02 02 2011 02 03 2011 02 03 2011 bubbles cavitation multiphase flow projectiles supercavitation multiphase flow hydrodynamics experimental techniques underwater projectile dynamics A supercavity is a cavitation bubble that is large compared with the dimensions...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. February 2011, 133(2): 021301.
Published Online: February 4, 2011
...Deify Law; Samuel T. Jones; Theodore J. Heindel; Francine Battaglia The external loop airlift reactor (ELALR) is a modified bubble column reactor that is composed of two vertical columns that are interconnected with two horizontal tubes and is often preferred over traditional bubble column reactors...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. December 2010, 132(12): 121302.
Published Online: December 29, 2010
...S. Gowing; T. Mori; S. Neely Air-augmented waterjets derive their propulsion from compressed gas mixed directly into the main flow. The gas bubbles expand as the mixture passes through the pressure gradient of the convergent nozzle, and energy is imparted to the water from the air in a complex...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. November 2010, 132(11): 111302.
Published Online: November 17, 2010
...Mohan Yadav; Justin D. Talley; Seungjin Kim This study presents a comparison of the geometric effects of 90 deg and 45 deg elbows in horizontal two-phase air-water bubbly flow. Two separate experiments were performed in the horizontal test section made out of 50.3 mm inner diameter glass tubes...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. November 2010, 132(11): 111301.
Published Online: November 9, 2010
... minima. Cavitation inception is investigated using two approaches: (i) a discrete bubble model wherein the bubble dynamics is computed by solving the Rayleigh–Plesset and the bubble motion equations using an adaptive time-stepping procedure and (ii) a scalar transport model for the liquid volume fraction...
Journal Articles
Article Type: Technical Briefs
J. Fluids Eng. November 2010, 132(11): 114501.
Published Online: November 3, 2010
.... Different liquids were used to better understand the mass transfer processes, where each of the fluids was saturated with oxygen, and the oxygen was then removed from the solution as air bubbled up or sparged through the solution from the bottom of the column. Air sparging was supplied by a single tube...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. October 2010, 132(10): 101402.
Published Online: October 12, 2010
...Tomomi Uchiyama; Shoji Matsumura This study proposes a three-dimensional vortex method for the simulation of bubbly flow. The method discretizes the vorticity field by vortex elements. The behavior of the vortex element and the bubble motion are simultaneously analyzed with the Lagrangian approach...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. October 2010, 132(10): 101301.
Published Online: October 6, 2010
...Hong Wang; Baoshan Zhu A numerical method including a macroscopic cavitation model based on the homogeneous flow theory and a microscopic cavitation model based on the bubble dynamics is proposed for the prediction of the impact force caused by cavitation bubble collapse in cavitating flows...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. August 2010, 132(8): 081302.
Published Online: August 26, 2010
...Bogdan A. Nichita; Iztok Zun; John R. Thome This paper describes the implementation of a 3D parallel and Cartesian level set (LS) method coupled with a volume of fluid (VOF) method into the commercial CFD code FLUENT for modeling the gas-liquid interface in bubbly flow. Both level set and volume...