Study on Two-Phase Flow Through a Micro T-Junction

Shibata, Yuichi; Ikeda, Koh; Chung, Peter M.-Y.; Hanari, Toshihide; Kawaji, Masahiro

doi:10.1115/fedsm2003-45385

Cited by 3 publications

(2 citation statements)

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“…In various microfluidic devices [2], controlling the flow rate of liquid or gas accurately at micro or nanoliter volume levels is required. Recently, the motion of a fluid without external forces in a small tube has been studied focusing on self-propelling liquid slug motions [3].…”

Section: Introductionmentioning

confidence: 99%

Emission of liquid droplets from an interface of bidrops pulled by a ferrofluid in a microchannel

Shibata¹,

Takamine²,

Kawaji³

2011

International Journal of Thermal Sciences

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Section: Introductionmentioning

confidence: 99%

Emission of liquid droplets from an interface of bidrops pulled by a ferrofluid in a microchannel

Shibata¹,

Takamine²,

Kawaji³

2011

International Journal of Thermal Sciences

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“…7,8 As is well-known, nanosized materials have a relatively low activation energy for grain-boundary migration because of the increased surface (interface)/volume ratio compared with the bulk counterparts. [9][10][11] The presence of rapid grain growth limits the stability of nanocrystalline YSZ coatings at the high temperatures. Costescu et al 12 suggested that the applications of nanosized (nanolaminates) materials as TBCs at temperatures higher than 1000°C would require the improvement of thermal stability of the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Nano–Nano Composite Powders of Lanthanum Zirconate and Yttria‐Stabilized Zirconia by Spray Pyrolysis

Kuo

Liu

2013

J. Am. Ceram. Soc.

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Powders composing of La2Zr2O7 (LZ) and (Zr0.8Y0.2)O1.9 (10YSZ) phases (volume ratio = 1:1) were synthesized by using a sol‐spray pyrolysis method. The effects of annealing temperature on the grain size and lattice parameter of the LZ–10YSZ powders were investigated. XRD results showed that the grain size of LZ and 10YSZ phases gradually grew from 10 to 95 nm and from 5 to 65 nm as the annealing temperature elevated from 900°C to 1200°C. The relative decreasing percentage of grain size comparing to that of the single‐phase LZ and 10YSZ powders were in the range 9%–36% and 37%–86%. The activation energy for grain growth of LZ and 10YSZ phases in the composite powders were 225 ± 12 and 382 ± 17 kJ/mol, which were 20% and 183% higher than that of the single‐phase counterparts. Obvious lattice contraction and lattice expansion for LZ and 10YSZ phases were observed at temperatures below 1100°C, respectively. SEM results revealed that LZ and 10YSZ phases were homogeneously distributed in the sintered bulk. The TEM results suggested that the grain growth was affected by the interaction on nanometer length scales of grain boundaries between LZ and 10YSZ phases in the composite.

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The Effects of Inlet Geometry and Gas-Liquid Mixing on Two-Phase Flow in Microchannels

Kawaji

Mori

Bolintineanu

2009

Journal of Fluids Engineering

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The effects of gas-liquid inlet geometry and mixing method on adiabatic gas-liquid two-phase flow in a microchannel of 100 μm diameter have been investigated using a T-junction inlet with the same internal diameter as the microchannel. Two-phase flow patterns, void fraction, and friction pressure drop data obtained with the T-junction inlet were found to be significantly different from those obtained previously with a reducer inlet. For the T-junction inlet, the two-phase flow patterns in the microchannel were predominantly intermittent flows with short gas and liquid plugs/slugs flowing with nearly equal velocities. The void fraction data then conformed nearly to that of a homogeneous flow model, and the two-phase friction multiplier data could be described by the Lockhart–Martinelli correlation applicable to larger channels. However, when a reducer inlet was used previously and the diameter of the inlet section was much larger than that of the microchannel, an intermittent flow of long gas slugs separated by long liquid slugs became prevalent and the void fraction decreased to values far below the homogeneous void fraction. The differences in the two-phase flow characteristics between a T-junction inlet and reducer inlet were attributed to the differences in the gas bubble/slug generation mechanisms.

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Study on Two-Phase Flow Through a Micro T-Junction

Cited by 3 publications

References 0 publications

Emission of liquid droplets from an interface of bidrops pulled by a ferrofluid in a microchannel

Emission of liquid droplets from an interface of bidrops pulled by a ferrofluid in a microchannel

Nano–Nano Composite Powders of Lanthanum Zirconate and Yttria‐Stabilized Zirconia by Spray Pyrolysis

The Effects of Inlet Geometry and Gas-Liquid Mixing on Two-Phase Flow in Microchannels

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