Experiments on the heat exchangers with the tubes of small diameters

Urban, František; Kubín, Milan; Kučák, Ľ

doi:10.1063/1.4892743

Cited by 2 publications

(2 citation statements)

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“…8 in study [25]. The second chosen study published by Urban et al [31] shows condensation heat transfer coefficient in range from a v = 4945 W/(m 2 K) to a v = 9191 W/(m 2 K) with the mean value a v = 7285 W/(m 2 K) in steel tube with inner diameter 6.5 mm. Third chosen study published by Ma et al [32] is focused on drop-wise and film-wise condensation with presence of noncondensable gas in copper tube with inner diameter 30 mm.…”

Section: Comparison Of Results With Other Experimental Studiesmentioning

confidence: 98%

“…Impact of variable inlet temperature and mass flow rate of water steam on condensation heat transfer coefficient is also studied. The obtained results are correlated with five chosen equations for prediction of condensation heat transfer coefficient and compared with other experimental studies [25,[31][32][33][34]. The wave's effect on condensation heat transfer coefficient is evaluated, too.…”

Section: Introductionmentioning

confidence: 99%

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Experimental analysis of steam condensation in vertical tube with small diameter

Kubín

Hirš

Plášek

2016

International Journal of Heat and Mass Transfer

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a b s t r a c tThermal design of tubular heat exchanger based on condensation heat of water steam requires knowledge of condensation heat transfer in the each tube. This paper is just aimed on experimental analysis of steam condensation in vertical copper tube in length of 1285 mm with 2.0 mm inner diameter and 0.5 mm wall thickness. Experimental measurement is performed in 12 steps with variable inlet temperature and mass flow rate of water steam. The heat transfer coefficient on the inner surface of tube in condensation zone is calculated by Thermal resistance method and Wilson plot method. The correlation quality of results obtained from both methods is 98.8%. The results are compared with other experimental studies and also correlated with five chosen equations for prediction of condensation heat transfer coefficient. The correlation quality of results obtained from this experimental analysis and four tested equations is over 96.6%, only theoretically determined Nusselt equation undervalues condensation heat transfer coefficient as is known. The Nusselt equation does not take to account waves on condensate surface. These waves on condensate surface are caused by flow of water steam in tube and the wave's effect is approximately 20.5% in this presented case.

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Section: Comparison Of Results With Other Experimental Studiesmentioning

confidence: 98%