An Evaluation of Film Condensation on Horizontal Integral-Fin Tubes

Marto, P. J.

doi:10.1115/1.3250627

Cited by 69 publications

(23 citation statements)

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“…This correlation well predicted experimental results for the number of the tube bank from 9 to 15 [14]. For that reason, this correlation is applied to the present numerical model.…”

Section: Numerical Modelsupporting

confidence: 60%

Steam condensing – liquid CO2 boiling heat transfer in a steam condenser for a new heat recovery system

Nikitin

Kato

Ishizuka

2008

International Journal of Heat and Mass Transfer

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“…This correlation well predicted experimental results for the number of the tube bank from 9 to 15 [14]. For that reason, this correlation is applied to the present numerical model.…”

Section: Numerical Modelsupporting

confidence: 60%

Steam condensing – liquid CO2 boiling heat transfer in a steam condenser for a new heat recovery system

Nikitin

Kato

Ishizuka

2008

International Journal of Heat and Mass Transfer

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“…[33,34,36] and Marto et al [37]. Also, the measurements by Nozu et al [51] on an inclined flat plate with fine longitudinal fins, further, the papers by Webb [38], Marto [39], and Rose [40] should be mentioned in this connection.…”

Section: Current Publicationsmentioning

confidence: 99%

Condensation of pure refrigerants R12, R134a and their mixtures on a horizontal tube with capillary structure: An experimental study

Mitrovic

1999

Forsch Ing-Wes

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We experimentally studied free convection condensation heat transfer of pure refrigerants R12, R134a, and their mixtures on a horizontal single tube. Approximately equimolar mixtures of these refrigerants are azeotropic. The outside surface of the tube used had a capillary structure. The tube was integrated in an experimental set-up in a way that allowed its rotation around the axis. Movable thermocouptes inserted in the tube wall enabled the determination of the average surface temperature. This temperature, the vapour bulk temperature, and the heat flux obtained from condensate collection served for the determination of the heat transfer coefficient.The condensation heat transfer of the pure refrigerants examined is observed to change with the driving temperature difference largely in accordance with the Nusselt theory. The experimental values of the heat transfer coefficient on the tube used, however, are by a factor of 2 larger than those on a smooth tube according to this theory. Under comparable conditions, the refrigerant R134a shows by 10 to 15% better heat transfer than R12. The heat transfer of mixtures decisively depends on the compositions of their phases. Basically, the stronger the compositions of the phases differ from each other, the lower the heat transfer coefficients; they always lie below those of R134a. In the range of low temperature difference, the heat transfer coefficient of mixtures increases with the temperature difference. This is the region of the so-called partial condensation. At a larger temperature difference, a local total condensation of the mixtures takes place and the heat transfer qualitatively follows the Nusselt theory.

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“…It has been reported that a finned-tube enhancement ratio up to 7 or 8 [1] was obtained for R-113 on a horizontal low-finned tube. But for high-surface-tension liquids (e.g., water), the condensate floods the fin spaces, making it difficult to get a high finned-tube enhancement ratio [2]. Considering this problem, Honda and colleagues [3], setting a porous drainage strip right under a finned tube to decrease the retention angle, found that 1.36 and 2 times the finned tube enhancement ratios were obtained for R-113 and methanol, respectively.…”

Section: Introductionmentioning

confidence: 96%

Study on enhancement of condensation heat transfer using an electric field

Chu

Toko

Nishio

et al. 2000

Heat Trans. Asian Res.

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Enhancement of condensation heat transfer using a nonuniform electric field was experimentally investigated for horizontal smooth and low‐finned tubes. In the experiments, a wire electrode parallel to the tube was placed beneath the tube. The experimental parameters were the distance and voltage between the wire electrode and the tube, and the condensation heat flux. Results of the present experiment for the low‐finned tube indicate that, as the applied voltage increases, the enhancement ratio increases steeply at a certain voltage and it reaches 2.4. It was observed that the condensate flow pattern falling down from the bottom of the tube changed from a flat film to circular columns at a critical voltage. © 2000 Scripta Technica, Heat Trans Asian Res, 29(4): 269–279, 2000

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An Evaluation of Film Condensation on Horizontal Integral-Fin Tubes

Cited by 69 publications

References 0 publications

Steam condensing – liquid CO2 boiling heat transfer in a steam condenser for a new heat recovery system

Steam condensing – liquid CO2 boiling heat transfer in a steam condenser for a new heat recovery system

Condensation of pure refrigerants R12, R134a and their mixtures on a horizontal tube with capillary structure: An experimental study

Study on enhancement of condensation heat transfer using an electric field

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