Stratified flow model for convective condensation in an inclined tube

Show simple item record Lips, Stephane Meyer, Josua P. 2012-10-25T09:32:11Z 2012-10-25T09:32:11Z 2012-08
dc.description.abstract Experimental data are reported for condensation of R134a in an 8.38 mm inner diameter smooth tube in inclined orientations with a mass flux of 200 kg/m2 s. Under these conditions, the flow is stratified and there is an optimum inclination angle, which leads to the highest heat transfer coefficient. There is a need for a model to better understand and predict the flow behaviour. In this paper, the state of the art of existing models of stratified two-phase flows in inclined tubes is presented, whereafter a new mechanistic model is proposed. The liquid–vapour distribution in the tube is determined by taking into account the gravitational and the capillary forces. The comparison between the experimental data and the model prediction showed a good agreement in terms of heat transfer coefficients and pressure drops. The effect of the interface curvature on the heat transfer coefficient has been quantified and has been found to be significant. The optimum inclination angle is due to a balance between an increase of the void fraction and an increase in the falling liquid film thickness when the tube is inclined downwards. The effect of the mass flux and the vapour quality on the optimum inclination angle has also been studied. en
dc.description.librarian ai2013
dc.description.sponsorship The NRF, TESP, Stellenbosch University/ University of Pretoria, SANERI/SANEDI, CSIR, EEDSM Hub and NAC. en_US
dc.description.uri en
dc.identifier.citation Stephane Lips & Josua P. Meyer, Stratified flow model for convective condensation in an inclined tube, International Journal of Heat and Fluid Flow, vol. 36, pp. 83-91 (2012), doi: 10.1016/j.ijheatfluidflow.2012.03.005. en
dc.identifier.issn 0142-727X (print)
dc.identifier.issn 1879-2278 (online)
dc.identifier.other 10.1016/j.ijheatfluidflow.2012.03.005
dc.language.iso en en
dc.publisher Elsevier en
dc.rights © 2012 Elsevier. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in International Journal of Heat and Fluid Flow. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Heat and Fluid Flow, vol 36, August 2012, doi: 10.1016/j.ijheatfluidflow.2012.03.005. en
dc.subject Stratified flow model en
dc.subject Convective condensation en
dc.subject Inclined tube en
dc.subject.lcsh Fluid dynamics en
dc.subject.lcsh Tubes -- Fluid dynamics en
dc.subject.lcsh Tubes -- Thermodynamics en
dc.subject.lcsh Heat -- Transmission en
dc.subject.lcsh Condensation en
dc.subject.lcsh Expansion (Heat) en
dc.title Stratified flow model for convective condensation in an inclined tube en
dc.type Postprint Article en

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