Flow Patterns and Frictional Pressure Drop in Gas-Liquid Two-Phase Flow in Vertical Capillary Channels with Rectangular Cross Section.

Ide, Hideo; Matsumura, Hirohisa; Tanaka, Yuji; Fukano, Tohru

doi:10.1299/kikaib.63.452

Cited by 17 publications

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“…For mini-channels, under the same given G j and L j , the flow pattern for vertical flow is quite similar to that for horizontal flow [32,33]. This similarity indicates that compared to the effect of buoyancy, the effect of surface tension is predominant in mini-channels of this size [26,29].…”

Section: Polarization Characteristics Of Electrolysismentioning

confidence: 55%

“…In our previous study [9], the flow pattern was compared and analyzed using the flow map presented by Mishima and Hibiki [30]. To investigate the relation between flow pattern of two-phase flow and pore diameter of current collector, in the present study, the flow pattern was analyzed in more detail by doing an extended survey of literature [26][27][28][29][30][31][32][33][34][35][36][37] in terms of mini-channels, whose channel diameter ranged from 0.5 to 2.0mm.…”

Section: Polarization Characteristics Of Electrolysismentioning

confidence: 99%

“…shows the calculated G j and L j in the anode channel of the electrolyzer during electrolysis at i = 0.2, 0.5, 1.0, 2.0, and 3.0 A/cm 2 . Based on the flow map and the description by Ide et al[32,33] and Cubaud and Ho[28], dispersed bubbly flow (Fig. 4A) can be observed only under a limited condition, namely, at high liquid flow rate and low gas flow rate (represented by the upper-left region in Fig.…”

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confidence: 90%

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Experimental study on porous current collectors of PEM electrolyzers

Ito¹,

Maeda²,

Nakano³

et al. 2012

International Journal of Hydrogen Energy

165

118

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Experimental study on proton exchange membrane (PEM) electrolyzer was carried out focusing on the effect of pore structural properties of current collectors, such as porosity and pore diameter. Various titanium (Ti)-felt substrates with different porosities and 2 pore diameters (measured by capillary flow porometry) were used as the anode current collector. Results show that when the mean pore diameter of the current collector was larger than 10 μm, the electrolysis performance improved with decreasing pore diameter. In contrast, changes in porosity had no significant effect on the cell performance when the porosity exceeded 0.50. The flow pattern of two-phase flow in the flow channel was discussed in terms of its relationship to bubble size and to pore diameter of the current collector. Finally, correlation between the calculated membrane resistance and the measured pore diameter of the current collectors suggest that larger bubbles generated from larger pores tend to become long bubbles in the channel, thus hindering the water supply to the membrane.

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Section: Polarization Characteristics Of Electrolysismentioning

confidence: 55%

Section: Polarization Characteristics Of Electrolysismentioning

confidence: 99%

mentioning

confidence: 90%

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Experimental study on porous current collectors of PEM electrolyzers

Ito¹,

Maeda²,

Nakano³

et al. 2012

International Journal of Hydrogen Energy

165

118

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show abstract

“…Flow regime, void fraction, rising velocity of slug bubbles and frictional pressure drops were measured. Ide et al [13] reported the flow patterns and frictional pressure drops in air-water flow in a vertical capillary tube having an inner diameter of 0.9 mm. Zhao and Bi [14] studied the two-phase flow patterns of air-water in vertical capillary channels with triangular cross-section having hydraulic diameters ranging from 0.866 to 2.866 mm.…”

Section: Introductionmentioning

confidence: 99%

Two-phase flow patterns of nitrogen and nanofluids in a vertically capillary tube

Wang

Bao

2009

International Journal of Thermal Sciences

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“…ñî ' ' ü 0 " ' ü ü ö ! ()õ " ü ò ル内の流動現象との相違を解明することが目的である。従来から比較的断面が大きい流路内の薄い環状液膜を精度よく計測できる深野の定電流法 (CECM) [8]をマイクロ流路に適用して、マイクロ流路内の流動現象の遷移と密接な関係を有する液体ホールドアップ η [3]の瞬時値 η(t)を、流路下面に内壁面と同一面になるように Fig. 1 12ä42f óôõ05ïÝ]*+$ù RST%&26\b*+7Öî ×H2887897Öî*+9:7 8C&,;<=>2 8 9 a c?…”

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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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Flow Patterns and Frictional Pressure Drop in Gas-Liquid Two-Phase Flow in Vertical Capillary Channels with Rectangular Cross Section.

Cited by 17 publications

References 0 publications

Experimental study on porous current collectors of PEM electrolyzers

Experimental study on porous current collectors of PEM electrolyzers

Two-phase flow patterns of nitrogen and nanofluids in a vertically capillary tube

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