Abstract
Evaporation from nanoporous membranes is an emerging and efficient thermal management strategy for microelectronic devices, and its mechanism has been extensively studied. It has been found that there are many factors that affect the evaporation rate, such as porosity and meniscus. In this paper, the equivalent evaporation coefficient is introduced to account for all these factors to transform the nanopore evaporation into one-dimensional plane evaporation so that the evaporation flux from any nanopore configuration can be simply solved. Theoretical analysis and modeling are performed, and direct simulation Monte Carlo (DSMC) method is used to verify the reliability of the model. The proposed equivalent evaporation coefficient incorporates the meniscus shape, nanopore transmissivity, nanopore porosity, and the intrinsic evaporation coefficient with solid physical sounds. The overall accuracy of our model is excellent, with 94.5% of simulated data being predicted within 5%. The physical meaning of the equivalent evaporation coefficient presented in this paper is clear and comprehensive, which significantly facilitates engineering application.
Published Version
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