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Journal of Enhanced Heat Transfer
Fator do impacto: 0.562 FI de cinco anos: 0.605 SJR: 0.211 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimir: 1065-5131
ISSN On-line: 1563-5074

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v13.i4.40
pages 321-332

A Model of the Azimuthal Capillary Effect due to Internal Porous Pipe Coating in Stratified Two-Phase Flow

M. E. Rojas
Renewable Energy Division, CIEMAT, Avda, Complutense, 22, 28040 Madrid, Spain
M. C. De Andres
Renewable Energy Group, Faculty of Physics, University of Complutense, 28040 Madrid, Spain

RESUMO

This paper presents a model for predicting the azimuthal effect produced by a porous coating inside a pipe when an external heat flux is applied. Thanks to this effect, such a porous coating helps to keep the inner surface of the pipe wet above the level of the stratified two-phase flow, enhancing the transference of an external heat flux. The paper also presents experimental results which are in agreement with the theoretical model and reveal some problems related to the use of porous coatings under severe conditions.