Boiling heat transfer of R-22, R-134a, and CO2 in horizontal smooth minichannels

Choi, Kwang-Il; Pamitran, Agus Sunjarianto; Oh, Chi-Ok; Oh, Jong-Taek

doi:10.1016/j.ijrefrig.2007.04.007

Cited by 87 publications

(33 citation statements)

References 21 publications

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“…The heat transfer coefficient increased with the heat flux increment. As previously pointed, several authors (Choi et al, 2007, andLin et al, 2001) have associated this behavior with nucleate boiling in the initial part of boiling, mainly under high heat flux. This condition will tend to be suppressed at high vapor quality where the effect of heat flux on heat transfer coefficient becomes lower and the coefficient decreases, as can be observed in Figs.…”

Section: Heat Transfermentioning

confidence: 72%

“…The same tendency was reported by Lazarek and Black (1982) and Wambsganss (1993) with R-113 boiling in similar dimension tubes (3.1 mm and 2.92 mm, respectively). However, the results shown by Yan and Lin (1998), Lin et al (2001) and Choi et al (2007) demonstrated the effects of mass velocity and vapor quality. The results of Lin et al (2001) with R-141b in 1.3 to 3.69 mm channels were different and significant variations in heat transfer coefficients with heat flux and vapor quality were observed, and also the influence of mass flux was verified decreasing the channel diameter.…”

Section: Introductionmentioning

confidence: 90%

See 1 more Smart Citation

Boiling of R-134a in horizontal mini tube

Copetti¹,

Macagnan²,

Kunsler³

2011

J. Braz. Soc. Mech. Sci. & Eng.

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Section: Heat Transfermentioning

confidence: 72%

Section: Introductionmentioning

confidence: 90%

Boiling of R-134a in horizontal mini tube

Copetti¹,

Macagnan²,

Kunsler³

2011

J. Braz. Soc. Mech. Sci. & Eng.

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“…A heat transfer database including 2336 data points extracted from the selected 11 published papers has been compiled [31][32][33][34][35][36][37][38][39][40][41]. The database covers a wide range of test fluids and experimental parameter ranges: 8 test fluids including R410A, R141b, R134a, R245fa, R12, R123, R22 and N2, tube diameter: 0.19 -3.69 mm, mass flux: 20 -1471.2 kg/m 2 s, heat flux: 5 -150 kW/m 2 and both horizontal and vertical arrangements.…”

Section: Models and Correlation Of Flow Boiling Heat Transfer In Micrmentioning

confidence: 99%

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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“…More vigorous nucleate boiling was observed when the smaller diameter tube was used. Flow boiling heat transfer experiments with different refrigerants were continually carried out by Choi et al (2007b). They indicated that the use of CO 2 caused the heat transfer coefficient to be higher than the case of R-134a and R-22 fluids.…”

Section: Two-phase Heat Transfermentioning

confidence: 99%

A Critical Review of Recent Investigations on Flow Pattern and Heat Transfer During Flow Boiling in Micro-Channels

Saisorn¹

2012

Frontiers in Heat and Mass Transfer

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Boiling heat transfer of R-22, R-134a, and CO2 in horizontal smooth minichannels

Cited by 87 publications

References 21 publications

Boiling of R-134a in horizontal mini tube

Boiling of R-134a in horizontal mini tube

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

A Critical Review of Recent Investigations on Flow Pattern and Heat Transfer During Flow Boiling in Micro-Channels

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