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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Recent Studies on Surface Roughness and Wettability Effects in Pool Boiling

Get access (open in a dialog) DOI: 10.1615/IHTC15.kn.000027
pages 479-496

Abstract

Recent analytical, numerical and experimental studies on roughness and wettability effects in pool boiling from horizontal heated surfaces are summarized in this paper. Measurements on nucleation bubble density, bubble departure diameter, departure frequency, heat transfer coefficient, and critical heat flux (CHF) in pool boiling from hydrophilic heated surfaces with micro-structures (micro-pillars and micro-cavities) and nanostructures (nano wires and nano cavities) are compared. Thermodynamic analyses based on changes in Gibbs free energy and availability are presented, and wettability and microstructures effects on nucleation radius, nucleation temperature and nucleation heat flux are illustrated. A recent critical heat flux model based on a force balance on a bubble, with the wicking force in the microstructures and distortion of critical wave length taken into consideration, is shown to be in good agreement with experimental data. Lattice Boltzmann simulation results for bubble nucleation, growth and departure from cavities on a heated horizontal surface with various contact angles in pool boiling are presented.