Research Papers: Two-Phase Flow and Heat Transfer

Frictional Pressure Drop Correlations for Single-Phase Flow, Condensation, and Evaporation in Microfin Tubes

[+] Author and Article Information
Zan Wu

Department of Energy Sciences,
Lund University,
P.O. Box 118,
Lund SE 22100, Sweden
e-mail: zan.wu@energy.lth.se

Bengt Sundén

Fellow ASME
Department of Energy Sciences,
Lund University,
P.O. Box 118,
Lund SE 22100, Sweden
e-mail: bengt.sunden@energy.lth.se

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 1, 2015; final manuscript received June 27, 2015; published online September 2, 2015. Assoc. Editor: Amitabh Narain.

J. Heat Transfer 138(2), 022901 (Sep 02, 2015) (9 pages) Paper No: HT-15-1020; doi: 10.1115/1.4031268 History: Received January 01, 2015; Revised June 27, 2015

Experimental single-phase, condensation, and evaporation (flow boiling) pressure drop data from the literature and our previous studies were collected to evaluate previous frictional pressure drop correlations for horizontal microfin tubes of different geometries. The modified Ravigururajan and Bergles correlation, by adopting the Churchill model to calculate the smooth-tube friction factor and by using the hydraulic diameter in the Reynolds number, can predict single-phase turbulent frictional pressure drop data relatively well. Eleven pressure drop correlations were evaluated by the collected database for condensation and evaporation. Correlations originally developed for condensation and evaporation in smooth tubes can be suitable for microfin tubes if the friction factors in the correlations were calculated by the Churchill model to include microfin effects. The three most accurate correlations were recommended for condensation and evaporation in microfin tubes. The Cavallini et al. correlation and the modified Friedel correlation can give good predictions for both condensation and evaporation. However, some inconsistencies were found, even for the recommended correlations.

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Grahic Jump Location
Fig. 1

Evaluation of the Li et al. [7] correlation for our single-phase experimental data of two-tested microfin tubes, Nos. 1 and 3. The Petukhov [34] correlation is shown for comparison.

Grahic Jump Location
Fig. 2

Evaluation of (a) the Li et al. [7] correlation and (b) the modified Ravigururajan and Bergles correlation against the collected single-phase database

Grahic Jump Location
Fig. 3

Void fraction comparison between the homogeneous model, the Smith [36] model, and the Rouhani and Axelsson [37] model for (a) R123 and (b) R410A at 30 °C

Grahic Jump Location
Fig. 4

Predictive evaluation of the modified Beattie and Whalley [40], the Friedel [19], the Muller-Steinhagen and Heck [41], and the Gronnerud [42] correlations for condensation in microfin tubes

Grahic Jump Location
Fig. 5

Comparison of (a) the Kedzierski and Goncalves [43] and the Haraguchi et al. [44] correlations and (b) the Choi et al. [25], the Cavallini et al. [18], and the Goto et al. [45] correlations for condensation in microfin tubes

Grahic Jump Location
Fig. 6

Predictive evaluation of the modified Beattie and Whalley [40], the Friedel [19], the Muller-Steinhagen and Heck [41], and the Gronnerud [42] correlations for evaporation in microfin tubes

Grahic Jump Location
Fig. 7

Comparison of (a) the Kuo and Wang [32] and the Wongsa-ngam et al. [30] correlations and (b) the Choi et al. [25], the Cavallini et al. [18], and the Goto et al. [45] correlations for evaporation in microfin tubes



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