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Journal of Enhanced Heat Transfer
Fator do impacto: 1.406 FI de cinco anos: 1.075 SJR: 0.287 SNIP: 0.653 CiteScore™: 1.2

ISSN Imprimir: 1065-5131
ISSN On-line: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v1.i1.70
pages 77-86

Pure Vapour Condensation of Refrigerants 11 and 113 on a Horizontal Integral Finned Tube at High Vapour Velocity

B. Bella
Istituto di Fisica Tecnica dell'Universita di Padova Via F. Marzolo, 9-35131 Padova-Italy
Alberto Cavallini
Dipartimento di Fisica Tecnica, Universita di Padova, via Venezia 1,I-35131 Padova, Italy
Giovanni Antonio Longo
Dept. of Management and Engineering, University of Padova, Str.lla S. Nicola, 3, 36100, Vicenza - IT
Luisa Rossetto
University of Padova, Department of Industrial Engineering, via Venezia 1, 35131 Padova, Italy

RESUMO

The experimental apparatus for measuring heat transfer coefficients during condensation of halogenated refrigerants on a single horizontal finned tube is presented.
Two different series of experimental runs, relative to Rll and R113 respectively, have been carried out under vapour velocity ranging from 2 to 30 m/s.
Present experimental data show a heat transfer enhancement due to vapour shear stress: at the highest vapour velocity there is a 50% increase in the heat transfer coefficient with respect to values measured during condensation of stagnant vapour. The enhancement starts to be evident when the vapour Reynolds number is greater than 100000. Present experimental data are compared with the most recent theoretical models: at almost stationary conditions data are very well reproduced by Honda et al. [1987a, 1987b] model, with a mean percentage deviation around 8%.


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