Prediction and a New Correlation of Holdup in Gas-Liquid Two-Phase Flow in Vertical Rectangular Capillary Channels.

Ide, Hideo; Matsumura, Hirohisa; Fukano, Tohru

doi:10.1299/kikaib.64.2811

Trans.JSME, Ser.B

1998

DOI: 10.1299/kikaib.64.2811

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Prediction and a New Correlation of Holdup in Gas-Liquid Two-Phase Flow in Vertical Rectangular Capillary Channels.

Hideo Ide¹,

Hirohisa Matsumura²,

Tohru Fukano³

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2011

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Cited by 2 publications

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“…They proposed that the difference at a>0.6 was attributed to the existence of entrained liquid droplets not detected by the conductance method employed. Ide and Fukano (2003) examined the effect of surface tension on two-phase flow behavior in a small horizontal rectangular duct 10·1 mm in size in comparison to the previous experiment for a vertical orientation (Ide et al 1999). By adding a surfactant, only the value of surface tension was decreased to 0.47-1.0 times of that for pure water.…”

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Boiling and two-phase flow in channels with extremely small dimensions: a review of Japanese research

Ohta

2005

Microfluid Nanofluid

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Research concerning micro-actuators utilizing vapor-liquid interfacial phenomena has been carried out extensively to develop thermal devices applied to micromachines. On the other hand, the application of twophase flow is useful for the removal of waste heat from the semiconductor chips with highly increased heat generation density to be integrated in notebook PCs. In the present paper, the latest Japanese research on boiling and two-phase flow in minichannels is reviewed, covering the topics for the fundamental phenomena and practical applications. Boiling in a narrow channel between parallel plates is an ideal system for the development of high-performance heat exchangers with extremely small sizes. The promising approaches to increasing the critical heat flux (CHF) are introduced, including those by the present author, to compensate for the disadvantages inherent in this system. KeywordsMicrochannel AE Minichannel AE Boiling AE Two-phase flow AE Critical heat flux List of symbols D Inner diameter (m) D e Hydraulic diameter (m) G Mass velocity (kg/m 2 s) g/g e Ratio of gravity to the normal gravity j Superficial velocity (m/s) P Pressure (Pa) q Heat flux (W/m 2 ) q CHF Critical heat flux (W/m 2 ) q o Heat flux evaluated from power input (W/m 2 ) q w Surface heat flux (W/m 2 ) s Gap size (mm) T Temperature (°C), or aspect ratio u Liquid velocity (m/s)

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confidence: 99%

Boiling and two-phase flow in channels with extremely small dimensions: a review of Japanese research

Ohta

2005

Microfluid Nanofluid

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“…1 ö 3 4 5 6 7 8 9 6 12ä42f óôõ05ïÝ]*+$ù RST%&26\b*+7Öî ×H2887897Öî*+9:7 8C&,;<=>2 8 9 a c? 0*+9:78C&@642789 7Ö0 9\78ABó x789CD} ÞE5FGH/Na93aba`p¡' "$1 9789ìí7/CD0EÞ*0N`9 78C& 9ab0`3I02J S¤0c f 134K0Ra93789L¹# ìaeMNO;P5±b88 9 a cd 5H bS¤0QRóô078\bp¡¬ae1W b010Sb (b) Data in minichannels by Ide and Fukano [5]. Fig.…”

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Ide¹,

SATONAKA²,

Fukano³

2011

JAPANESE JOURNAL OF MULTIPHASE FLOW

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Experiments were made to clarify the mean void fraction, the mean holdup, the velocity of liquid slug and the flow patterns of air-water two-phase flow in horizontal flat rectangular microchannels with the dimensions of the width and depths of 1.0 x 0.1 mm and 1.0 x 0.2 mm, respectively. The flow patterns of bubble flow, slug flow and annular flow were observed. These data in the microchannel showed relatively similar tendencies to that in the minichannels with the width of 1~10mm and the depth of 1mm which we had previously reported. In a channel of 1.0 x 0.1 mm, however, the mean holdup and the holdup which correspond to the base film thickness in annular flow gave larger values because the effects of liquid viscosity and surface tension on the holdup and void fraction became dominant. The remarkable flow characteristics of rivulet flow and the flow with partial dry out mainly on the upper channel wall were observed in slug flow and annular flow regions in the channel of 0.1 mm depth. These data in the microchannel showed relatively similar tendencies to that in the minichannels with the width of 1~10mm and the depth of 1mm which we had previously reported. In a channel of 1.0 x 0.1 mm, however, the mean holdup and the holdup which correspond to the base film thickness in annular flow gave larger values because the effects of liquid viscosity and surface tension on the holdup and void fraction became dominant. The remarkable flow characteristics of rivulet flow and the flow with partial dry out mainly on the upper channel wall were observed in slug flow and annular flow regions in the channel of 0.1 mm depth.

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Prediction and a New Correlation of Holdup in Gas-Liquid Two-Phase Flow in Vertical Rectangular Capillary Channels.

Cited by 2 publications

References 0 publications

Boiling and two-phase flow in channels with extremely small dimensions: a review of Japanese research

Boiling and two-phase flow in channels with extremely small dimensions: a review of Japanese research

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