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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

Flow Condensation Heat Transfer on Engineered Surfaces

Get access (open in a dialog) DOI: 10.1615/IHTC15.tpm.008561
pages 8527-8537

要約

Condensation heat transfer has recently received a lot of renewed attention due to the development and use of surfaces with micro- and nano-scale features. Most of the new surfaces tend to promote dropwise condensation which leads to higher rates of heat transfer when compared with filmwise condensation. In the current study, the effects of surface morphology and surface chemistry on the condensation mechanisms have been investigated using engineered surfaces. Firstly, hybrid surfaces consisting of an array of micropillars with hydrophobic and hydrophilic sites and other engineered surfaces have been designed to exhibit a distinct Cassie-Baxter wetting behavior. Experiments have revealed that a nanoparticles-based hydrophobic surface depicts a unique wetting behavior which could lead to enhanced dropwise condensation under the right ambient conditions. Experiments have been conducted to determine the heat transfer performance of hybrid and other engineered surfaces under a constant humidity level, surface-to-ambient temperature difference, and laminar flow conditions. Results to date show that condensed droplet dynamics play an important role during the overall condensation process.