Flow boiling heat transfer of R134a and R245fa in a 2.3 mm tube

Tibiriçá, Cristiano; Ribatski, Gherhardt

doi:10.1016/j.ijheatmasstransfer.2010.01.038

Cited by 109 publications

(36 citation statements)

References 26 publications

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“…Tibirica and Ribatski [59] conducted experiments of flow boiling with R134a and R245fa The local heat transfer behaviors are quite different for three flow rates. At lower heat fluxes, the heat transfer coefficient increases with increasing the heat flux.…”

Section: Fundamental Issues Of Flow Boiling Heat Transfer In Microscamentioning

confidence: 99%

Fundamental issues, mechanisms and models of flow boiling heat transfer in microscale channels

Cheng

Xia

2017

International Journal of Heat and Mass Transfer

170

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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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Section: Fundamental Issues Of Flow Boiling Heat Transfer In Microscamentioning

confidence: 99%

Fundamental issues, mechanisms and models of flow boiling heat transfer in microscale channels

Cheng

Xia

2017

International Journal of Heat and Mass Transfer

170

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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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“…In Vakili-Farahani et al's experiment [7] with refrigerants R1234ze and R245fa, the heat transfer coefficient increases with rising of saturated temperature, heat flux and mass flux. Tibiriçá et al [8] did experiment in a horizontal 2.3 mm I.D. stainless steel tube utilizing working fluids R134a and R245fa.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Research on R245fa Condensation Heat Transfer inside a Horizontal Tube

Liu¹,

Huo²,

Liu³

et al. 2015

ENG

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Numerical simulation on R245fa condensation inside an inner diameter of 8 mm horizontal tube is researched in this paper. The effect of variation in velocity, condensation temperature and superheat of inlet steam and variation in cooling water temperature on heat transfer coefficient are investigated as a parametric study. Condensation process of steam has been successfully modeled by applying a user defined function (UDF) added to the commercial computational fluid dynamics (CFD) package. By analyzing the corresponding condensate contours and the curves of local heat transfer coefficient, the relationships between condensation heat transfer coefficient and various parameters of R245fa inside horizontal tube are obtained. It shows that the heat transfer coefficient increases by the increase in velocity, condensation temperature and superheat of inlet steam and the decrease in cooling water temperature. The errors between the heat transfer coefficient of simulation result and model of Wang and Shah are within ±30%. The parametric study will provide the basis for designing efficient heat exchangers of R245fa.

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Flow boiling heat transfer of R134a and R245fa in a 2.3 mm tube

Cited by 109 publications

References 26 publications

Fundamental issues, mechanisms and models of flow boiling heat transfer in microscale channels

Fundamental issues, mechanisms and models of flow boiling heat transfer in microscale channels

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

Theoretical Research on R245fa Condensation Heat Transfer inside a Horizontal Tube

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