Two-phase flow in microchannels

Serizawa, Akimi; Zhou, Feng; Kawara, Zensaku

doi:10.1016/s0894-1777(02)00175-9

Cited by 493 publications

(195 citation statements)

References 25 publications

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“…The flow pattern observed for water-air system were plotted against the plane of gas and liquid superficial velocities, and identified the boundaries of operating conditions at which flow pattern changes from one to another. Serizawa et al (2002) reported variation of air-water flow pattern for a very wide range of gas and liquid flow velocities. The highest velocity was about 17 m/s for water and 300 m/s for air.…”

Section: Flow Patternsmentioning

confidence: 99%

Fluid Behavior and Mass Transport Characteristics of Gas–Liquid and Liquid–Liquid Flows in Microchannels

Sotowa

2014

J. Chem. Eng. Japan

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It has been widely recognized that microchannels can be used to enhance mass transfer rate between two immiscible uids. This feature has attracted interests of many researchers in the eld of chemical engineering. To exploit such feature of microchannels, the ow characteristics and mass transfer behavior must be fully understood. In addition, to construct an industrial scale process consisting of microchannels, an e cient numbering-up technique is required. In this review, an overview of the recent literature on the uid ow and mass transfer behavior in multiphase ow in microchannels will be given. An attention is also paid to the numbering-up technique and extension to multiphase system involving three uids.

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Section: Flow Patternsmentioning

confidence: 99%

Fluid Behavior and Mass Transport Characteristics of Gas–Liquid and Liquid–Liquid Flows in Microchannels

Sotowa

2014

J. Chem. Eng. Japan

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“…The results showed that the pressure drop had a minimum value at an aspect ratio of about 1.6. Serizawa et al [6] observed several types of flow such as a dispersed bubbly flow, a gas slug flow, a liquid ring flow, a liquid lump flow, a skewed barbecue shaped flow, an annular flow, a frothy or wispy annular flow, a rivulet flow, and a flow of liquid droplets. In this study the moisture in the air and the steam were used as the working fluid.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Microchannel Geometry on Phase Transition for Two Phase Flow in Microchannel Heat Sinks

Le¹,

Nguyen²,

Dang³

2018

IJPER

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Abstract. The effects of microchannel geometry on the phase transition between liquid and vapour for the two phase flow were investigated both numerically and experimentally. In the study the rounded edge rectangular microchannel heat sink was found to have the phase transition earlier than the rectangular one in both numerical simulation and experimental data by about 1.5 seconds. The outlet temperature and vapour quality of the rounded edge rectangular microchannel heat sink was higher than those obtained from the rectangular microchannel heat sink. Also, the phase transition curves achieved in the evaporation were parabolic in shape. The output vapour temperature achieved a steady state with the maximum value at around 2 minutes, 30 seconds. In addition the numerical results matched well with the experimental data. These numerical results have not yet been seen in literature reviews.Keywords: Microchannel, two phases, temperature, numerical simulation, experiment. IntroductionIn recent years the heat transfer behaviour of the two phase flow in microchannels has become an interesting topic. Regarding the microchannel heat transfer fields, Yun et al.[1] investigated in the boiling heat transfer coefficients and the two-phase pressure drops of rectangular microchannels. The microchannels have a hydraulic diameter of 1.36 and 1.44 mm. R410A was used as the working fluid and the heat flux obtained was from 10 to 20 kW/m2. The results showed that the boiling heat transfer coefficients in the microchannels were much higher than those in single tubes under similar test conditions. In addition, they also showed that the pressure drop accelerated with the increasing mass flux at a constant saturation temperature. Also in addition, the pressure drop decreased with an increasing saturation temperature at a given mass flux, Schilder et al.[2] studied the pressure drop and the convective heat transfer characteristics in a circular tube with a diameter of 600 µm and with the working fluid being ethanol. The experiments were carried out for both the two phase flow and single phase flow. The results showed that the mean pressure drop for two phase flow was about three times higher than that for the single phase flow. The Nusselt number for the two phase flow was not dependent on the heat flux and increased with raising the mass flux. The alternating slanted passage in the channel wall as a secondary flow was investigated by Kuppusamy et al. [3]. The results showed that when comparing the alternating slanted passage microchannel heat sink with the conventional one the overall performance of the microchannel heat sink with alternating slanted passage increased by 146% and the thermal resistance reduced to 76.8%. Ergu et al.[4] studied the pressure drop and local mass transfer of the rectangular microchannel with a hydraulic diameter of 208 µm. The microchannels have a width of 3.70 mm, a height of 0.107 mm and a length of 35 mm. Distilled water was used to measure the pressure drop and was also used as the working fluid. Reynol...

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“…The small length scales of these systems could strongly affect the dynamics and energy requirements associated with phase change and multiphase flows (Kavehpour et al, 1997). Furthermore, it has been found that the liquid-vapor phase transition in these systems occurs abruptly in an unstable manner and abruptly (Serizawa et al, 2002). This behavior is entirely differently from the phase transition found in large-scale devices (Chung and Kawaji, 2004).…”

Section: Introductionmentioning

confidence: 99%

CFD Modeling of the Combustion Characteristics and Stability in Catalytic Micro-Channels

Junjie¹,

Xu²

2017

AJHMT

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Combustion characteristics and stability of premixed methane-air mixtures in catalytic micro-channels is studied numerically, using CFD (computational fluid dynamics). The characteristics of the fluid mechanics are also analyzed. A two-dimensional CFD model with detailed reaction mechanisms and multicomponent transport is developed to evaluate the effect of operating conditions on the combustion stability. The laminar flow is assumed, and steady-steady simulations are performed. The fuel-lean equivalence ratio operation limit for the system is determined by the analysis of Reynolds number. The primary focus is on CFD as a means of understanding thermal management at small scales. It is shown that an appropriate choice of the flow velocity is crucial in achieving the self-sustained operation. Large gradients in temperature and species concentration are observed, despite the small scales of the system under certain conditions. The flow velocity is very important as it determines the flame location. Furthermore, the flow velocity plays a dual, competing role in the stability of the system. Low flow velocities reduce the heat generation, whereas high flow velocities reduce the convective time-scale. There is a narrow regime of flow velocities that allows self-sustained operation. When a low-power system is desired, highly insulating materials should be preferred, whereas a high-power system would favor highly conductive materials. Engineering maps that delineate combustion stability are constructed. In order to gain further insight into the combustion characteristics of the system, the optimum Reynolds number is determined. Finally, design recommendations are made.

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Two-phase flow in microchannels

Cited by 493 publications

References 25 publications

Fluid Behavior and Mass Transport Characteristics of Gas–Liquid and Liquid–Liquid Flows in Microchannels

Fluid Behavior and Mass Transport Characteristics of Gas–Liquid and Liquid–Liquid Flows in Microchannels

The Effects of Microchannel Geometry on Phase Transition for Two Phase Flow in Microchannel Heat Sinks

CFD Modeling of the Combustion Characteristics and Stability in Catalytic Micro-Channels

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