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Multiphase Science and Technology
SJR: 0.124 SNIP: 0.222 CiteScore™: 0.26

ISSN Imprimir: 0276-1459
ISSN On-line: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v12.i3-4.140
15 pages

INFLUENCE OF MICROSCALE CONCENTRATION GRADIENTS IN NUCLEATE BOILING HEAT TRANSFER OF BINARY MIXTURES

Jurgen Kern
Darmstadt University of Technology, Chair of Technical Thermodynamics, Petersenstr. 30, 64287 Darmstadt, Germany
Peter Stephan
Institute for Technical Thermodynamics, Technische Universität Darmstadt, 64287 Darmstadt, Germany

RESUMO

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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