Horizontal flow boiling of R22 and R407C in a 9.52 mm micro-fin tube

Kuo, C. S.; Wang, Chi-Chuan

doi:10.1016/1359-4311(95)00076-3

Cited by 48 publications

(11 citation statements)

References 11 publications

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“…(5) Heat transfer coefficients are reasonably predicted by Chamra and Mago [40], Newell and Shah [32] and Koyama et al [35] correlation.…”

Section: Discussionsupporting

confidence: 68%

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Evaporation heat transfer and pressure drop of R-410A in three 7.0 mm O.D. microfin tubes having different inside geometries

Kim

2015

J Mech Sci Technol

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R-410A evaporation heat transfer and pressure drop data are provided for three 7.0 mm O.D. microfin tubes. The microfin tubes had different helix angle, fin height and fin apex angle. Tests were conducted for a range of quality (0.2 ~ 0.8), mass flux (216 ~ 390 kg/m 2 s), heat flux (9 ~ 17 kW/m 2 ) and saturation temperature (8 ~ 12 o C). It was found that three microfin tubes yielded approximately the same heat transfer coefficients. Microfin tube with larger inter-fin spacing or smaller helix angle yielded lager pressure drop. Both heat transfer coefficient and pressure drop increased as mass flux or quality increased. However, they decreased as saturation temperature increased. The range of heat transfer enhancement factor (1.37 ~ 1.97) was comparable with that of pressure drop penalty factor (1.22 ~ 1.77). Data are compared with available heat transfer and pressure drop correlations.

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“…(5) Heat transfer coefficients are reasonably predicted by Chamra and Mago [40], Newell and Shah [32] and Koyama et al [35] correlation.…”

Section: Discussionsupporting

confidence: 68%

“…Table 5 shows that the heat ransfer enhancement factor increases as saturation temperature decreases although the difference is not significant. Similar effects of heat flux and saturation temperature on enhancement factor were reported by Kuo and Wang [35]. Overall, the enhancement factor ranges from 1.37 to 1.97.…”

Section: Evaporation Heat Transfer Coefficientsupporting

confidence: 77%

Evaporation heat transfer and pressure drop of R-410A in three 7.0 mm O.D. microfin tubes having different inside geometries

Kim

2015

J Mech Sci Technol

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“…Kuo and Wang [114] experimentally studied forced convection boiling of R22 and R407C. A microfin tube having nominal diameter of 9.52 mm was used.…”

Section: Horizontal and Vertical Orientationsmentioning

confidence: 99%

Comprehensive Review on the Flow Characteristics of Two-Phase Flows in Inclined Tubes

Karademir¹,

Ozcelik²,

Açıkgöz³

et al. 2021

Journal of Thermal Engineering

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This paper presents a comprehensive review of research works on condensation and boiling heat transfer characteristics in horizontal, vertical and inclined tubes both smooth and enhanced. Although there are many studies examining two-phase flows inside tubes, it is almost impossible to find such a comprehensive study for two-phase flow in tubes. Moreover, while number of the studies concerning condensation or boiling inside tubes are limited, the present study covers almost all studies of condensation and boiling inside inclined tubes. Previous studies are classified into many subtitles according to configuration (horizontal, vertical or inclined) and roughness (smooth or enhanced) as well as aim of the study (researching the effect of parameters on the heat transfer coefficient, pressure drop or evaluation of prediction correlation). Such a wide range of classification and scope have no done before. Condensation and boiling phenomena are of great importance in heat exchangers, cooling systems, etc. due to their wide utilization in those devices. Additionally, two-phase flow and the associated heat transfer are becoming increasingly important in industrial applications because the heat transfer coefficient in twophase flows is much higher than in single-phase flows. In this research, major topics such as heat transfer, pressure drop, friction factor and void fraction were studied using active and passive techniques in the literature. The fluids used in the reviewed studies diverse in a very wide range. For pure refrigerants (single component-fluorocarbon refrigerant),

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“…Regarding the enhanced tube (microfin tubes, in our example, with 60 microfins, a helix angle of 18 and a fin height of 0.2 mm), the model by Koyama et al (1995) was used for calculating the heat transfer coefficient. The pressure drops have been determined using the correlation by Kuo and Wang (1996). The area ratio (Ar) between the enhanced and the smooth tubes is arbitrarily set to 1.5.…”

Section: Applicationsmentioning

confidence: 99%

Entropy generation during flow boiling of pure refrigerant and refrigerant–oil mixture

Revellin

Bonjour

2011

International Journal of Refrigeration

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Horizontal flow boiling of R22 and R407C in a 9.52 mm micro-fin tube

Cited by 48 publications

References 11 publications

Evaporation heat transfer and pressure drop of R-410A in three 7.0 mm O.D. microfin tubes having different inside geometries

Evaporation heat transfer and pressure drop of R-410A in three 7.0 mm O.D. microfin tubes having different inside geometries

Comprehensive Review on the Flow Characteristics of Two-Phase Flows in Inclined Tubes

Entropy generation during flow boiling of pure refrigerant and refrigerant–oil mixture

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