Saturated flow boiling heat transfer: review and assessment of prediction methods

Fang, Xiande; Zhuang, Fengting; Chen, Chuang; Wu, Qi; Chen, Yanyu; Chen, Yuanyuan; He, Yan

doi:10.1007/s00231-018-2432-1

Cited by 34 publications

(9 citation statements)

References 117 publications

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“…Qiu et al [5] observed that the Grönnerud model [27] was the unique method capable to properly capture their isobutane pressure drop measurements, while classical models like Friedel [28] and Műller Steinhagen and Heck [29] did not perform acceptably. Differently, Yang et al [4] found an acceptable consistency of their data with Műller Steinhagen and Heck [29]. Similar results were found by Hamdar and co-authors [7] for their R152a measurements.…”

Section: R600asupporting

confidence: 73%

“…Despite those fluids are promising alternatives to R134a and available for relatively longtime, the studies about heat transfer behavior of R152a and R600a during in-tube flow boiling are still limited. In 2019 Fang et al [4] performed a thoroughly literature review about saturated flow boiling heat transfer. Considering horizontal smooth tubes, they found only four papers investigating R600a for a total number of 820 data points.…”

Section: Z E ( E ) H a V E B E E N P R O P O S E D ( M O S T L Ymentioning

confidence: 99%

“…Finally, the model by Fang et al [26] was included. This equation is fitted on a very large database, including R600a data of Yang et al [4] and the R152a data of Hamdar et al [7]. Fang and his group, in their review [1] tested several models and found that the Fang et al [26] equation used for R134a, R600a and R152a outperformed any other equation considered by them.…”

Section: R600amentioning

confidence: 99%

See 2 more Smart Citations

Flow boiling heat transfer capabilities of R134a low GWP substitutes inside a 4 mm id horizontal smooth tube: R600a and R152a

et al. 2020

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R134a was recognized as probably one of the most important refrigerants of the two past decades. Among the proposed alternative fluids, there are certainly isobutane (R600a) and R152a. This article presents about 200 new heat transfer coefficient and pressure drop data obtained during flow boiling of R152a and R600a inside a smooth copper tube having an internal diameter of 4 mm. Three saturation temperatures were considered for each refrigerant, from 5 °C to 20 °C. Furthermore, for each temperature studied, the heat flux was varied between 15 and 30 kW m−2 and the refrigerant mass flux from 100 to 400 kg m−2 s−1. After presenting the new data, a critical comparison was proposed between the performance of these refrigerants and R134a. Finally, some classic correlations available in the literature have been implemented. The deviations between the calculated and experimental values were reported and commented.

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Section: R600asupporting

confidence: 73%

Section: Z E ( E ) H a V E B E E N P R O P O S E D ( M O S T L Ymentioning

confidence: 99%

Section: R600amentioning

confidence: 99%

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Flow boiling heat transfer capabilities of R134a low GWP substitutes inside a 4 mm id horizontal smooth tube: R600a and R152a

et al. 2020

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“…A classical correlation presented by Kanizawa is employed for the analysis of the effect of efficient flow pattern global construction heat transfer enhancement mechanism on the EFGE [15] . The correlation is verified that predicts HTC accurately [16] . The form is as follows:…”

Section: Correlationmentioning

confidence: 63%

Thermodynamic Performance Study on the Novel Efficient Flow Pattern Global Construction Evaporator

Zhong

Bai

Ding

et al. 2021

Preprint

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To improve in-tube evaporation heat transfer at low quality, a novel evaporator based on efficient flow pattern global construction heat transfer enhancement mechanism is built, called the efficient flow pattern global construction evaporator (EFGE). The numerical analysis and experimental study of the thermodynamic performance of the EFGE are performed. Results show that the evaporation heat transfer coefficient (HTC) of the EFGE is 0.34–1.04 times that of a common parallel flow evaporator (PFE) and the pressure drop of the EFGE is only 80–116% of that of a common PFE at quality 0.9. The theoretical nonuniformity of the evaporation HTC between low- and high-quality flow is approximately 12–67%, which 55–72% of the pressure drop. The numerical analysis results are in good agreement with the finding that the EFGE has better thermodynamic performance than the PFE in terms of friction power reduction and minimum entropy generation number.

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“…Even for macro-scale tubes, where more investigations have been conducted compared to microchannels, the widely used physical correlations for the prediction of phase-change heat transfer coefficient consider the effect of the hydraulic diameter not accurately enough [6,7]. In the past years, the effect of D h has been also included in correlations where minichannels are utilised [8][9][10][11][12][13][14]. In the following paragraphs, a review of published investigations is shown, aiming to determine the effect of hydraulic diameter on the heat transfer and two-phase flow characteristics.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Hydraulic Diameter on Flow Boiling within Single Rectangular Microchannels and Comparison of Heat Sink Configuration of a Single and Multiple Microchannels

et al. 2021

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Phase change heat transfer within microchannels is considered one of the most promising cooling methods for the efficient cooling of high-performance electronic devices. However, there are still fundamental parameters, such as the effect of channel hydraulic diameter Dh, whose effects on fluid flow and heat transfer characteristics are not clearly defined yet. The objective of the present work is to numerically investigate the first transient flow boiling characteristics from the bubble inception up to the first stages of the flow boiling regime development, in rectangular microchannels of varying hydraulic diameters, utilising an enhanced custom VOF-based solver. The solver accounts for conjugate heat transfer effects, implemented in OpenFOAM and validated in the literature through experimental results and analytical solutions. The numerical study was conducted through two different sets of simulations. In the first set, flow boiling characteristics in four single microchannels of Dh = 50, 100, 150, and 200 μm with constant channel aspect ratio of 0.5 and length of 2.4 mm were examined. Due to the different Dh, the applied heat and mass flux values varied between 20 to 200 kW/m2 and 150 to 2400 kg/m2s, respectively. The results of the two-phase simulations were compared with the corresponding initial single-phase stage of the simulations, and an increase of up to 37.4% on the global Nu number Nuglob was revealed. In the second set of simulations, the effectiveness of having microchannel evaporators of single versus multiple parallel microchannels was investigated by performing and comparing simulations of a single rectangular microchannel with Dh of 200 μm and four-parallel rectangular microchannels, each having a hydraulic diameter Dh of 50 μm. By comparing the local time-averaged thermal resistance along the channels, it is found that the parallel microchannels configuration resulted in a 23.3% decrease in the average thermal resistance R¯l compared to the corresponding single-phase simulation stage, while the flow boiling process reduced the R¯l by only 5.4% for the single microchannel case. As for the developed flow regimes, churn and slug flow dominated, whereas liquid film evaporation and, for some cases, contact line evaporation were the main contributing flow boiling mechanisms.

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Saturated flow boiling heat transfer: review and assessment of prediction methods

Cited by 34 publications

References 117 publications

Flow boiling heat transfer capabilities of R134a low GWP substitutes inside a 4 mm id horizontal smooth tube: R600a and R152a

Flow boiling heat transfer capabilities of R134a low GWP substitutes inside a 4 mm id horizontal smooth tube: R600a and R152a

Thermodynamic Performance Study on the Novel Efficient Flow Pattern Global Construction Evaporator

The Effect of Hydraulic Diameter on Flow Boiling within Single Rectangular Microchannels and Comparison of Heat Sink Configuration of a Single and Multiple Microchannels

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