Convective boiling heat transfer characteristics of CO2 in microchannels

Ren, Yun; Kim, Yongchan; Kim, Min Soo

doi:10.1016/j.ijheatmasstransfer.2004.08.019

Cited by 96 publications

(41 citation statements)

References 14 publications

(24 reference statements)

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“…Compared with conventional channels, evaporation in small channels may provide a higher heat transfer coefficient due to their higher contact area per unit volume of fluid. In evaporation within small channels, as reported by Bao et al (2000), Zhang et al (2004), Kandlikare-Steinke (2003), Tran et al (2000), Pettersen (2004), Park and Hrnjak (2007), Zhao et al [7], Yun et al (2005), Yoon et al (2004), Pamitran et al (2008), and K.-I. Choi (2009), the contribution of nucleate boiling is predominant and laminar flow appears.…”

Section: Introductionmentioning

confidence: 83%

Two-Phase Flow Boiling Heat Transfer for Evaporative Refrigerants in Various Circular Minichannels

Oh¹,

Hoo-Kyu²,

Choi³

2011

Heat Transfer - Theoretical Analysis, Experimental Investigations and Industrial Systems

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Section: Introductionmentioning

confidence: 83%

Two-Phase Flow Boiling Heat Transfer for Evaporative Refrigerants in Various Circular Minichannels

Oh¹,

Hoo-Kyu²,

Choi³

2011

Heat Transfer - Theoretical Analysis, Experimental Investigations and Industrial Systems

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“…It can be seen that heat transfer coefficient increases from 3 to 8 kW/m 2 K for vapor qualities from 0.2 to 0.8 according to Kim et al [20] while for Bang and Choo [19] heat transfer coefficient presents an almost constant value of 2 kW/m 2 K. Figure 4(b) shows the comparison between the data of Yun et al [22] and Pamitran and Choi [21] for R410A flow boiling in microchannels, revealing remarkable discrepancies. According to Yun et al [22], heat transfer coefficient increases with x until a vapour quality of 0.8 while for Pamitran and Choi [21] heat transfer coefficient is almost constant until vapour qualities of 0.4 and then decreases monotonically with vapour quality. Furthermore, at x = 0.4, Tsat = 10 o C and q = 15 kW/m 2 , Yun et alobtained heat transfer coefficients nearly 3 times those obtained by Pamitran and Choi and up to 10 times at larger vapour quality.…”

Section: Fundamental Issues On Microchannel Flow Boilingmentioning

confidence: 88%

On the Phenomenal Mechanisms and Prediction Methods of Flow Boiling Heat Transfer in Microchannels

Cheng¹

2017

World Congress on Momentum, Heat and Mass Transfer

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-This keynote paper presents a comprehensive analysis of phenomenal mechanisms and the available correlations and models of flow boiling heat transfer in micro-channels. First, studies on flow boiling heat transfer behaviours and mechanisms in microchannels are presented. Then, the available correlations and models of flow boiling heat transfer in micro-channels are reviewed and analysed. Comparisons of 12 correlations with a database covering a wide range of test parameters and 8 fluids are presented. It shows that all correlations poorly agree to the database. Furthermore, comparisons of the mechanistic flow boiling heat transfer models based on flow patterns including the Thome at al. three-zone heat transfer model for evaporation in microchannel and the flow pattern based model combining the Thome et al. three zone heat transfer models with the Cioncolini-Thome annular flow model for both macro-and microchannel to the database are presented. It shows that the flow pattern based model combining the three zone model with the annular flow model gives better prediction than the three zone heat transfer model alone. The flow pattern based heat transfer model favourably agrees with the experimental database. According to the comparison and analysis, suggestions have been given for improving the prediction methods in the future. Furthermore, flow patterned based phenomenological models and their applications to micro channels are discussed. According to this comprehensive review and analysis of the current research on the flow boiling heat transfer mechanisms and prediction methods in micro-channels, the future research needs have been identified and recommended. In general, systematic and accurate experimental data of flow boiling heat transfer in micro-channels are still needed although a large amount of work has been done over the past decades. The channel size effect on the flow boiling behaviours should be systematically investigated. Heat transfer mechanisms in micro-channels should be further understood and related to the corresponding flow patterns. Furthermore, effort should be made to develop and improve generalised mechanistic prediction methods and theoretical models for flow boiling heat transfer in micro-channels according to the physical phenomena/mechanisms and the corresponding flow structures. The effects of the channel size and a wide range of test conditions and fluid types should be considered in developing new prediction methods.

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“…This may be caused by the channel size, working fluids, heat methods or measurement accuracy etc. Just to show two examples here, Figure 15 shows comparison of the experimental data of flow boiling heat transfer coefficient with CO 2 by Yun et al [100] No explanation why there is such a big difference even was offered in their paper. Figure 16 shows the comparison of the CO 2 flow boiling heat transfer coefficients of Pettersen [101] Harirchian and Garimella [65] conducted experiments of flow boiling with FC-77 in multiple rectangular microscale channel heat sinks.…”

Section: Fundamental Issues Of Flow Boiling Heat Transfer In Microscamentioning

confidence: 99%

“…29(b) Comparison of the whole R234fa heat transfer coefficient data to the flow pattern based heat transfer model combining the three zone heat transfer model [87] with the unified annular flow heat transfer model [106,107]. [54] and Yun et al [68] illustrated by Ribatski et al in their review paper [7]. [116].…”

Section: Unstable and Transient Flow Boiling Heat Transfer In Microscmentioning

confidence: 99%

Visualization study on the instabilities of phase-change heat transfer in a flat two-phase closed thermosyphon

Xia

Wang

Cheng

et al. 2017

Applied Thermal Engineering

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This paper presents state-of-the-art review on the fundamental and frontier research of flow boiling heat transfer, mechanisms and prediction methods including models and correlations for heat transfer in microscale channels. First, fundamental issues of current research on flow boiling in microscale channels are addressed. These mainly include the criteria for macroscale and microscale channels. Then, studies on flow boiling heat transfer behaviours and mechanisms in microscale channels are presented. Next, the available correlations and models of flow boiling

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Convective boiling heat transfer characteristics of CO2 in microchannels

Cited by 96 publications

References 14 publications

Two-Phase Flow Boiling Heat Transfer for Evaporative Refrigerants in Various Circular Minichannels

Two-Phase Flow Boiling Heat Transfer for Evaporative Refrigerants in Various Circular Minichannels

On the Phenomenal Mechanisms and Prediction Methods of Flow Boiling Heat Transfer in Microchannels

Visualization study on the instabilities of phase-change heat transfer in a flat two-phase closed thermosyphon

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