Evaporation heat transfer and pressure drop of R-410A in flattened smooth tubes having different aspect ratios

Kim, Nae-Hyun; Lee, Eul-Jong; Byun, Ho-Won

doi:10.1016/j.ijrefrig.2012.10.001

Cited by 22 publications

(15 citation statements)

References 16 publications

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“…(6) Frictional pressure drop data are well predicted by Choi et al [50], Cavallini et al [41] and Bandarra Filho et al [33] correlation. …”

Section: Discussionmentioning

confidence: 53%

“…Fig. 10(a) shows that L tube data are reasonably underpredicted by Choi et al [50] (23% RMS error), Cavallini et al [41] (29% RMS error), Bandarra Filho et al [33] (30% RMS error) correlation. Kuo and Wang [34], Newell and Shah [32], Goto et al [38] and Wu et al [16] correlation highly underpresicted the data.…”

Section: Friction Pressure Dropmentioning

confidence: 81%

“…The microfin tube data are compared with available correlations (Kuo and Wang [34] Cavallini et al [41], Choi et al [50], Newell and Shah [32], Goto et al [38], Bandarra Filho et al [33], Wu et al [16]), and the results are shown in Fig. 10.…”

Section: Friction Pressure Dropmentioning

confidence: 99%

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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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“…(6) Frictional pressure drop data are well predicted by Choi et al [50], Cavallini et al [41] and Bandarra Filho et al [33] correlation. …”

Section: Discussionmentioning

confidence: 53%

Section: Friction Pressure Dropmentioning

confidence: 81%

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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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“…The effect of the shape of the cross-section of a horizontal tube (circular cross-section w/h ¼ 1, ellipsoidal cross-sections w/h ¼ 2, w/h ¼ 4) on heat transfer coefficients and flow resistance values of R410A was examined by Kim et al (2013). The results of their measurements included in (Kim et al, 2013) indicate a growing impact of the mass flux density, heat flux and saturation temperature on heat transfer coefficient values regardless of tube shape.…”

Section: Passive Boiling Heat Transfer Enhancement Methodsmentioning

confidence: 99%

Refrigerant boiling at low heat flux in vertical tubes with heat transfer enhancing fittings

Niezgoda-Żelasko¹,

Żelasko²

2015

International Journal of Refrigeration

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“…The effect of the shape of the horizontal tube (circular cross-section w/h=1 and ellipsoidal crosssections w/h=2, w/h=4) on heat transfer coefficients and flow resistance values of R410A was examined by Kim et al [9].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the boiling process of refrigerants with high temperature glide and low gwp

Niezgoda-Żelasko

2017

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Enhancement of the boiling process of refrigerants with high temperature glide and low gwp Intensyfikacja procesu wrzenia czynników chłodniczych o dużym poślizgu temperaturowym i niskim gwp AbstractThe paper presents the results of experimental studies of the enhancement of the boiling process of a zeotropic agent with high temperature glide inside tubes at a low heat flux density. It discusses the effect of three types of inserts on the heat transfer process and the flow resistances during boiling of R407C in vertical tubes. The experimental studies covered measurements of heat transfer coefficient values, flow resistance values and thermal efficiency in the measurement section.Keywords: boiling, heat transfer enhancement inserts, heat transfer coefficients, flow resistances Sreszczenie Przedmiotem prezentowanej publikacji są wyniki badań eksperymentalnych intensyfikacji procesu wrzenia wewnątrz rur czynnika zeotropowego z dużym poślizgiem temperaturowym w warunkach niskich gęstości strumieni ciepła. W ramach pracy omówiono wpływ zastosowania trzech rodzajów wkładek na proces wymiany ciepła czynnika R407C i opory przepływu podczas wrzenia w rurach pionowych. Wyniki badań doświadczalnych obejmują pomiary wartości współczynników przejmowania ciepła, oporów przepływu oraz wydajności cieplnej uzyskiwanej w odcinku pomiarowym.Słowa kluczowe: wrzenie, wkładki intensyfikujące wymianę ciepła, współczynniki przejmowania ciepła, opory przepływu

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Evaporation heat transfer and pressure drop of R-410A in flattened smooth tubes having different aspect ratios

Cited by 22 publications

References 16 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

Refrigerant boiling at low heat flux in vertical tubes with heat transfer enhancing fittings

Enhancement of the boiling process of refrigerants with high temperature glide and low gwp

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