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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

THE TWO-LAYERS COMPOSITE STRUCTURE OF BIOMIMETIC COPPER FOREST AND HONEYCOMB-LIKE POROUS STRUCTURE TO ENHANCE POOL BOILING PERFORMANCE

Get access (open in a dialog) DOI: 10.1615/IHTC16.bae.023974
pages 1241-1248

Abstract

Pool boiling heat transfer performance can be enhanced by two-layer composite structure (TLCS). Herein, we proposed the TLCS which combined the biomimetic copper forest and honeycomb-like porous structure. According to the pool boiling experiment with degassed DI water at atmosphere pressure, the TLCS has superior heat transfer performance than the plain copper surface, the biomimetic copper forest and the honeycomb-like porous structure. When the heat flux is 96 W·cm-2, the heat transfer coefficient of TLCS is 3.4 times, 1.5 times and 1.2 times over those of the plain copper surface, the biomimetic copper forest and the honeycomb-like porous structure, respectively. When the heat flux was 160 W·cm-2, the heat transfer coefficient of the TLCS reached 22.5 W·cm-2·K-1. The bubble dynamics images clearly show that, most bubbles on the TLCS have shorter periods which contributes to the better heat transfer performance. The TLCS combines the efficient nucleate sites from the honeycomb-like porous structure and the continuous liquid supply from the forest, which lead to the best heat transfer performance among these samples.