Bubble and liquid flow characteristics in a vertical bubbling jet

Iguchi, Manabu; Ueda, Hiroshi; Uemura, Tomomasa

doi:10.1016/0301-9322(95)00014-o

Cited by 47 publications

(34 citation statements)

References 48 publications

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“…É importante ressaltar que a Equação 4 é dimensionalmente consistente, ao contrário das equações clássicas de Davidson e Amick (1956) e Leibson et al (1956), além de mais simples do que a equação mais recente de Iguchi et al (1995). Salienta-se que Re representa os efeitos de quantidade de movimento e turbulência, enquanto L representa o efeito do empuxo.…”

Section: Methodsunclassified

“…Vale ressaltar ainda que a Equação 4 assume que as interações entre as bolhas devido à presença de múltiplos orifícios são desprezíveis, uma vez que a vazão por orifícios Q/n é utilizada no lugar da vazão Q. dos orifícios. Combinando os resultados experimentais aqui obtidos com aqueles disponíveis na literatura (LEITCH & BAINES, 1989;IGUCHI et al, 1995;RENSEN & ROIG, 2001;LIMA NETO et al, 2008a) foi possível obter a seguinte relação adimensional baseada na equação 4:…”

Section: Methodsunclassified

“…Essas equações têm sido desde então largamente empregadas para a estimativa do tamanho das bolhas em sistemas de injeção de ar na água (SZEKELY & THEMELIS, 1971;LEITCH & BAINES, 1989;IGUCHI et al, 1991). Correlações mais recentes, como a de Iguchi et al (1995) …”

Section: Introductionunclassified

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Tamanho de bolhas de ar formadas por difusores não porosos na água

Neto

2015

Eng. Sanit. Ambient.

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RESUMONeste estudo foram realizados experimentos para investigar o tamanho de bolhas de ar formadas a partir de difusores não porosos em um tanque de água.O tamanho das bolhas individuais e o diâmetro de Sauter foram avaliados usando uma técnica de processamento de imagens. Os resultados confirmam que a vazão de ar e o diâmetro do orifício são parâmetros importantes que controlam a distribuição do tamanho das bolhas e o diâmetro de Sauter.Análise dimensional é realizada para fornecer uma relação adimensional geral para predição do diâmetro de Sauter (usando uma escala de comprimento adequada, baseada na vazão de ar) e o número de Reynolds na saída do orifício. Essa relação apresenta bom ajuste aos dados experimentais obtidos neste estudo e a partir de investigações anteriores disponíveis na literatura, incluindo também experimentos com múltiplos orifícios. Finalmente, são apresentadas aplicações potenciais da relação adimensional obtida.Palavras-chave: análise dimensional; bolhas; diâmetro de Sauter; processamento de imagens; plumas.

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Section: Methodsunclassified

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Tamanho de bolhas de ar formadas por difusores não porosos na água

Neto

2015

Eng. Sanit. Ambient.

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“…The tangential velocity component of water flow, v qw , was measured with particle image velocimetry (PIV) 3) and the axial velocity component, v zw , was measured with laser Doppler velocimetry (LDV). 6) This is because the axial velocity component is much smaller than the tangential velocity component, and the measurement accuracy of the LDV is higher than that of the PIV. The motions of tracer particles dispersed in the water were recorded with a CCD camera at 30 frames per second for the PIV measurement, as shown in Fig.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Behavior of Immiscible Two Liquid Layers Contained in Cylindrical Vessel Suddenly Set in Rotation.

Sugimoto

Iguchi

2002

ISIJ International

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Immiscible silicone oil and water were contained in a cylindrical vessel. The ratio of their volumes, referred to as the volume ratio, was varied over a wide range. The vessel was suddenly set in rotation, and the flow velocities of the two liquids were measured with particle image velocimetry (PIV) and laser Doppler velocimetry (LDV). The flow establishment time was defined as the period from the start of rotation to the moment at which a steady state is established in the vessel. An empirical equation for the flow establishment time was proposed as a function of the volume ratio, the angular frequency of rotation, and the physical properties of the liquids. The deformation of the silicone oil-water interface was also observed to confirm the findings obtained from the velocity measurements.KEY WORDS: flow establishment time; rotating vessel; stratified liquid layers; particle image velocimetry; laser Doppler velocimetry. between the water and any kind of silicone oil is 53 mN/m. The diameter and the height of the vessel are 46 mm and 120 mm, respectively. The origin of the cylindrical coordinate system, (r, q, z), was placed on the center of the bottom plate. The vessel was connected to a stepping motor, and the vessel was enclosed with another transparent vessel of a square cross-section. Water was filled between the two vessels in order to decrease the parallax effect as much as possible. The cylindrical vessel was rotated suddenly at a predetermined constant rotation velocity, while the square vessel was fixed. The angular frequency of rotation, w, was varied from 2.36 rad/s to 11.00 rad/s. The kinematic viscosity of the silicone oil, n so , was changed from 1.0 mm 2 /s to 100 mm 2 /s.In general, the rotation Reynolds number is defined by: 1)ReϭR(w/n) where n w is the kinematic viscosity of water. The former Reynolds number plays an essential role in this study. The measurements were carried out in the laminar flow regime. 3,5) The volume ratio of water and silicone oil is defined by: where V w and V so are the volumes of water and silicone oil, respectively. The tangential velocity component of water flow, v qw , was measured with particle image velocimetry (PIV) 3) and the axial velocity component, v zw , was measured with laser Doppler velocimetry (LDV). 6) This is because the axial velocity component is much smaller than the tangential velocity component, and the measurement accuracy of the LDV is higher than that of the PIV. The motions of tracer particles dispersed in the water were recorded with a CCD camera at 30 frames per second for the PIV measurement, as shown in Fig. 2. The diameter of the particles ranged from 75 to 100 mm. The images thus recorded with the camera were processed on a personal computer to obtain the tangential velocity component. A schematic of the experimental apparatus for the LDV measurements is shown in Fig. 3. The deformation of the interface between water and silicone oil was also observed with the camera to confirm the flow establishment time obtained from velocity measur...

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“…Gas injection is considered to be the most economical and efficient way in all agitation methods. 1,2) Conventionally, there are three types of gas injection techniques: bottom gas injection, top gas injection, and combined bottom and top gas injection. In all kinds of gas injection modes, a swirl motion of the bath is of interest in applications in the steelmaking industry because the swirl motion is promising to enhance mixing and metallurgical reactions, although it causes severe erosion of the refractory and the vessel oscillations.…”

Section: Introductionmentioning

confidence: 99%

Swirl Motion in a Cylindrical Bath Agitated by Top Lance Gas Injection

et al. 2011

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Researches on top lance gas injection in a cylindrical bath are carried out based on water model experiments. The penetration depth of bubbles and a swirl motion are investigated because of their practical importance. Empirical equations are proposed for the penetration depth as a function of a modified Froude number. A bath surface oscillation map is drawn in order to identify the occurrence condition of the swirl motion, and then empirical equations are proposed for describing the occurrence condition of the swirl motion. The characteristics of the swirl motion are also analyzed, and empirical equations are proposed to predict starting time, period, amplitude, and damping time of the swirl motion.

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Bubble and liquid flow characteristics in a vertical bubbling jet

Cited by 47 publications

References 48 publications

Tamanho de bolhas de ar formadas por difusores não porosos na água

Tamanho de bolhas de ar formadas por difusores não porosos na água

Behavior of Immiscible Two Liquid Layers Contained in Cylindrical Vessel Suddenly Set in Rotation.

Swirl Motion in a Cylindrical Bath Agitated by Top Lance Gas Injection

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