Condensation in Microchannels

Chen, Yongping; Shi, Mingheng; Cheng, Ping; Peterson, G. P.

doi:10.1080/15567260701866702

Cited by 55 publications

(22 citation statements)

References 50 publications

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“…With the development of MEMS thermal devices, such as micro heat pipes, chip laboratories, micro fuel cells and micro thermal control systems, flow condensation in microchannels is turning out to be of considerable importance [1]. Recent experimental results indicate that the physical mechanisms of condensation in microchannels are quite different from those that occur in conventional scale channels.…”

Section: Introductionmentioning

confidence: 99%

Visualization study of steam condensation in wide rectangular silicon microchannels

Shi

Chen

et al. 2010

International Journal of Thermal Sciences

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Section: Introductionmentioning

confidence: 99%

Visualization study of steam condensation in wide rectangular silicon microchannels

Shi

Chen

et al. 2010

International Journal of Thermal Sciences

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“…Flow regimes significantly impact two-phase heat transfer coefficients for internal flows [10,11], and flow regimes have been mapped by Garimella [52] for condensation and Thome et al [53] for boiling. Kim and Mudawar [54] created a universal condensation heat transfer coefficient predicting model with one correction for annular flow and another correction for slug flow based on a modified Weber number.…”

Section: Introductionmentioning

confidence: 99%

“…Flow regimes and subsequent heat transfer performance have also been shown to differ in minichannels as compared to conventional channels, enhancing condensation heat transfer [10][11][12]. In mini-and microchannels, body forces such as gravity and buoyancy decrease in significance and surface tension increases in importance [10][11][12][13][14][15]. Condensation heat transfer coefficients typically increase with increasing mass flux and steam quality [7,8,12,13,16,17], except at low qualities [4,18].…”

Section: Introductionmentioning

confidence: 99%

“…Kandlikar [9] considered mini-channels to have diameters between 200 lm and 3 mm and microchannels to have diameters between 10 lm and 200 lm. Flow regimes and subsequent heat transfer performance have also been shown to differ in minichannels as compared to conventional channels, enhancing condensation heat transfer [10][11][12]. In mini-and microchannels, body forces such as gravity and buoyancy decrease in significance and surface tension increases in importance [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Combined Visualization and Heat Transfer Measurements for Steam Flow Condensation in Hydrophilic and Hydrophobic Mini-Gaps

Chu

Derby

2016

Journal of Heat Transfer

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Condensation enhancement was investigated for flow condensation in mini-channels. Simultaneous flow visualization and heat transfer experiments were conducted in 0.952-mm diameter mini-gaps. An open loop steam apparatus was constructed for a mass flux range of 50-100 kg/m 2 s and steam quality range of 0.2-0.8, and validated with single-phase experiments. Filmwise condensation was observed in the hydrophilic minigap; pressure drop and heat transfer coefficients were compared to the (Kim and Mudawar, 2013, "Universal Approach to Predicting Heat Transfer Coefficient for Condensing Mini/Micro-Channel Flow," Int. J. Heat Mass Transfer, 56(1-2), pp. 238-250) correlation and prediction was very good; the mean absolute error (MAE) was 20.2%. Dropwise condensation was observed in the hydrophobic mini-gap, and periodic cycles of droplet nucleation, coalescence, and departure were found at all mass fluxes. Snapshots of six typical sweeping cycles were presented, including integrated flow visualization quantitative and qualitative results combined with heat transfer coefficients. With a fixed average steam quality ( x ¼ 0.42), increasing mass flux from 50 to 75 to 100 kg/m 2 s consequently reduced average sweeping periods from 28 to 23 to 17 ms and reduced droplet departure diameters from 13.7 to 12.9 to 10.3 lm, respectively. For these cases, condensation heat transfer coefficients increased from 154,700 to 176,500 to 194,800 W/m 2 K at mass fluxes of 50, 75, and 100 kg/m 2 s, respectively. Increased mass fluxes and steam quality reduced sweeping periods and droplet departure diameters, thereby reducing liquid thickness and increasing heat transfer coefficients.

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“…Flow regimes affected condensation behavior; the absence of stratified flow, and the presence of annular flow at the mini-and micro-scales suggested that gravity does not play a significant role in small scale condensation [17,20,[22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Flow condensation heat transfer enhancement in a mini-channel with hydrophobic and hydrophilic patterns

Derby

Chatterjee

Peles

et al. 2014

International Journal of Heat and Mass Transfer

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Condensation in Microchannels

Cited by 55 publications

References 50 publications

Visualization study of steam condensation in wide rectangular silicon microchannels

Visualization study of steam condensation in wide rectangular silicon microchannels

Combined Visualization and Heat Transfer Measurements for Steam Flow Condensation in Hydrophilic and Hydrophobic Mini-Gaps

Flow condensation heat transfer enhancement in a mini-channel with hydrophobic and hydrophilic patterns

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