年間 4 号発行
ISSN 印刷: 0276-1459
ISSN オンライン: 1943-6181
Indexed in
INFLUENCE OF MICROSCALE CONCENTRATION GRADIENTS IN NUCLEATE BOILING HEAT TRANSFER OF BINARY MIXTURES
要約
Nucleate boiling heat transfer coefficients of binary mixtures can be calculated using a micro region model. The model is described and assessed by comparing calculated heat transfer coefficients with experimental values. The model includes the governing physical phenomena, such as the meniscus curvature, the adhesion pressure, and the interfacial thermal resistance as well as the local variation of composition and liquid-vapor equilibrium and the Marangoni effect. Due to the preferential evaporation of one component of the mixture, strong concentration gradients occur close to the heated wall. The influence of these microscale concentration gradients is investigated. By means of various calculations the physical phenomena are quantified and their relevance in the nucleate boiling process is evaluated.
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Kern J., Stephan P., Identifikation maßgeblicher, gemischspezifischer Einflüsse auf den Wärmeübergangskoeffizienten beim Blasensieden binärer Gemische, Chemie Ingenieur Technik, 74, 9, 2002. Crossref
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Stephan Peter, Kern Jürgen, Evaluation of heat and mass transfer phenomena in nucleate boiling, International Journal of Heat and Fluid Flow, 25, 2, 2004. Crossref