The Behavior of an Immiscible Equal Density Liquid-Liquid Two-Phase Flow in a Horizontal Tube.

Fujii, Terushige; Ohta, Junichi; Nakazawa, Takeshi; Morimoto, Osamu

doi:10.1299/jsmeb.37.22

Cited by 18 publications

(24 citation statements)

References 11 publications

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“…This may be due to capillary effects, which become more pronounced as channel dimensions decreased. The slug-annular transition studied in this work agrees well with that obtained by Fujii et al (1994) at low oil superficial velocity (V o ), although a difference appears with increasing V o ( Figure 6). Moreover, the domain of slug flow in the microchannel is smaller compared to the large channel.…”

Section: Microchannels Initially Saturated With Oilsupporting

confidence: 89%

“…Compared to the experimental results of Fujii et al (1994), the present transition droplet-slug flow takes place for a higher water volume fraction. This may be due to capillary effects, which become more pronounced as channel dimensions decreased.…”

Section: Microchannels Initially Saturated With Oilcontrasting

confidence: 64%

“…In contrast to liquid-liquid flow in large channels (Fujii et al, 1994), no isolated drops were observed in the liquid bridges between the slugs. A similar result was found for gas-liquid systems in microchannels (Fukano et al, 2005;Salim, 2006).…”

Section: Microchannels Initially Saturated With Oilmentioning

confidence: 71%

“…In this case, the pressure drop differs according to whether the less viscous fluid is in contact with the pipe wall or flows in the centre of the pipe (lubrification effect). However, due to density effects, liquid-liquid patterns in pipes are seldom annular, and other flow patterns are frequently encountered (Fujii et al, 1994;Beretta et al, 1997;Bannwart et al, 2004), namely dispersed, slug, bubbly, and plug flows. Angeli and Hewitt (2000) studied the effect of wettability on flow patterns.…”

Section: Introductionmentioning

confidence: 99%

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Oil–water two‐phase flow in microchannels: Flow patterns and pressure drop measurements

et al. 2008

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This paper investigates oil-water two-phase flows in microchannels of 793 and 667 m hydraulic diameters made of quartz and glass, respectively. By injecting one fluid at a constant flow rate and the second at variable flow rate, different flow patterns were identified and mapped and the corresponding two-phase pressure drops were measured. Measurements of the pressure drops were interpreted using the homogeneous and Lockhart-Martinelli models developed for two-phase flows in pipes. The results show similarity to both liquid-liquid flow in pipes and to gas-liquid flow in microchannels. We find a strong dependence of pressure drop on flow rates, microchannel material, and the first fluid injected into the microchannel.Onétudie dans cet article lesécoulements diphasiques huile-eau dans des micro-canaux de 793 m et 667 m de diamètre hydraulique faits de quartz et de verre, respectivement. En injectant un fluideà un débit constant et le secondà un débit variable, différents schémas d'écoulements ontété observés et représentés en diagrammes, et les pertes de charge diphasiques correspondantes ontété mesurées. Les mesures de perte de charge ontété interprétéesà l'aide du modèle homogène et du modèle de Lockhart-Martinelli mis au point pour lesécoulements diphasiques dans les conduites. Les résultats montrent une similaritéà la fois avec l'écoulement liquide-liquide et l'écoulement liquide de gaz dans des microcanaux. On a trouvé une forte dépendance de la perte de charge aux débits, au matériau des micro-canaux et au premier fluide injecté dans le micro-canal.

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Section: Microchannels Initially Saturated With Oilsupporting

confidence: 89%

Section: Microchannels Initially Saturated With Oilcontrasting

confidence: 64%

Section: Microchannels Initially Saturated With Oilmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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Oil–water two‐phase flow in microchannels: Flow patterns and pressure drop measurements

et al. 2008

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“…Glass carried out experiments for 1.2 meter long, 1 cm inner diameter tubing, in which the oil viscosity was varied from (10 to 30,000 cp), the oil gravity from (0.97 to 1.03), the volumetric water fraction from (0.09 to 0.8) and the superficial velocity of oil from (0.06 to 1.28) m/s, The indicated that the less viscous is the oil, the more is the core would tend to break up into globs of oil of various sizes [4]. Finally, Fujii, et al studied in acrylic pipe 2.5 cm diameter ,the oil viscosity was 61.5 and the density ratio 0.98 .The additional measurements pressure gradient , holdup water were performed .The observed flow patterns were stratified flow ,stratified with mixing and with increasing in the flow rate the viscous core breakup to either large slugs and elongated bubble or spherical bubble [5]. The oil layer loses its continuity and moves as discrete droplets separated by the water continuous-phase.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Experimental of Oil-Water Flow with Effect of Heat Transfer in Horizontal Pipe

Abed¹

2014

IJMEA

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Abstract:There is a strong tendency for two immiscible fluids to arrange themselves so that the low viscosity constituent is in the region of high share. Therefore, it may be possible to introduce a beneficial effect in any flow of a very viscous liquid by introducing amount of a fluid lubricated as liquid-liquid oil-water flow. Two main classes of flows are seen, annular and small bubble in all experimental results. The pressure drop and mean heat-transfer coefficients were observed to depend strongly on the flow patterns. A correlation of the two-phase mean heat-transfer coefficients, based on a simple model of liquid flow, with a Reynolds number based on the actual mean velocity of the liquid mixture two-phase flow, were developed. An experimental rig facility has been designed and constructed, to enable measurements of local parameters in oil-water flow in the developing region of the flow in a 32 mm ID 6 m long pipe. The large discrepancies between model predictions and experimental data are reported in the literature review that the physics of oil-water flow is complex and not yet fully understood. The flow patterns that appear are classified in flow pattern maps as functions of either mixture velocity and water cut or superficial velocities. From these experiments a smaller number of annular flows are selected for studies of velocity and turbulence. The theoretical study was executed using software Fluent program, a modified turbulent diffusion model is presented. Simulation results carried out with the model show more physical predictions with respect to the particle deposition process and concentration profile. The theoretical results represent the pressure gradient distribution, velocity and mean heat transfer coefficient, pressure contours, velocity vectors, streamlines, and also velocity profiles. It was found that the methods with more restrictions (in terms of the applicable range of void fraction, liquid superficial Reynolds number) give better predictions.

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Synthesis of superabsorbent resin by ultraviolet photopolymerization

Ruan

Qiao

Huang

et al. 2004

J of Applied Polymer Sci

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Synthesis of superabsorbent resin (SAR) was achieved by a new method, that of direct UV photopolymerization, and in particular the synthesis of a SAR of acrylic acid-potassium acrylate copolymer by UV photopolymerization was investigated. Influences of ratio (mol) of acrylate monomer to acrylic acid monomer, photoinitiators, crosslinking agents, and exposure time of UV light on the water-absorbent properties were investigated. The results showed that the water absorbency (Q) of SAR based on Irgacure 1700 or Irgacure 1800 was 545-530 mL/g, but under the same conditions Q was 450 mL/g for the SAR based on Irgacure 651. N,NЈ-Methylene bisacrylamide, hydroethyl acrylate, and glycerol were used as crosslinking agents, of which N,NЈ-methylene bisacrylamide was the most effective. It crosslinked the molecular chains through attending the copolymerization with acrylic acid (AA) and potassium acrylate. When the exposure time was 5 min, the value of Q was 1368 mL/g (the content of N,NЈ-methylene bisacrylamide was 100 ppm).

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The Behavior of an Immiscible Equal Density Liquid-Liquid Two-Phase Flow in a Horizontal Tube.

Cited by 18 publications

References 11 publications

Oil–water two‐phase flow in microchannels: Flow patterns and pressure drop measurements

Oil–water two‐phase flow in microchannels: Flow patterns and pressure drop measurements

Simulation and Experimental of Oil-Water Flow with Effect of Heat Transfer in Horizontal Pipe

Synthesis of superabsorbent resin by ultraviolet photopolymerization

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