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Decrement estimation of the heat transfer coefficient in mixture boiling

✍ Scribed by Junjie Gu; Hans-jörg Bartf

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
619 KB
Volume
77
Category
Article
ISSN
0008-4034

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✦ Synopsis

Based on the analysis of the principles of heat and mass transfer from the liquid bulk to bubble surface during nucleation, a new theoretical method to predict the heat transfer of the nucleate pool boiling in binary mixtures is proposed in this paper by using the heat and mass transfer analogy (Colburn analogy) at the bubble surface transfer layers. With use of Thome's concept of boiling range, an approximate method is derived to realize the calculation. The predicted results by this method are in good agreement with the experimental data from different sources. This hypothesis can also be applied to electrolyte solutions. This method is restricted to developed boiling cases, fortunately, which occur in most industrial applications.

Nous presentons dans cet article une nouvelle methode theorique afin de predire le transfert de chaleur lors du phenomene de 'pool boiling' dans les melanges binaires, en utilisant I'analogie transfert de matiere -transfert de chaleur (analogie de Colbum) au niveau des couches de transfert a la surface de la bulle. Elle s'appuie sur I'analyse des phenomenes de transfert de chaleur et de matiere de la phase liquide vers la surface de la bulle durant le processus de nucleation. C'est a partir du concept de 'boiling range' de Thome, que cette methode approximative a ete etablie. Les resultats obtenus sort en accord avec les donnees experimentales issues de differentes sources. L'hypothese, prise eu compte lors de la realisation de ce travail, peut egalement h e appliquee aux solutions electrolytiques. Cette methode est limitee a un liquide en forte ebullition, ce qui est le cas dans la plupart des applications industrielles.

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